@tensorflow/tfjs-data - npm Package Compare versions

Comparing version 4.2.0 to 4.3.0

dist/dataset.d.ts

@@ -26,3 +26,3 @@ /**
  */
-export declare type DatasetContainer = Container<Dataset<TensorContainer>>;
+export type DatasetContainer = Container<Dataset<TensorContainer>>;
 /**
@@ -29,0 +29,0 @@ * Represents a potentially large list of independent data elements (typically

dist/datasets/csv_dataset.js

@@ -42,61 +42,2 @@ /**
     /**
-     * Create a `CSVDataset`.
-     *
-     * @param input A `DataSource` providing a chunked, UTF8-encoded byte stream.
-     * @param csvConfig (Optional) A CSVConfig object that contains configurations
-     *     of reading and decoding from CSV file(s).
-     *
-     *     hasHeader: (Optional) A boolean value that indicates whether the first
-     *     row of provided CSV file is a header line with column names, and should
-     *     not be included in the data. Defaults to `true`.
-     *
-     *     columnNames: (Optional) A list of strings that corresponds to
-     *     the CSV column names, in order. If provided, it ignores the column
-     *     names inferred from the header row. If not provided, infers the column
-     *     names from the first row of the records. If hasHeader is false and
-     *     columnNames is not provided, this method throws an error.
-     *
-     *     columnConfigs: (Optional) A dictionary whose key is column names, value
-     *     is an object stating if this column is required, column's data type,
-     *     default value, and if this column is label. If provided, keys must
-     *     correspond to names provided in columnNames or inferred from the file
-     *     header lines. If isLabel is true any column, returns an array of two
-     *     items: the first item is a dict of features key/value pairs, the second
-     *     item is a dict of labels key/value pairs. If no feature is marked as
-     *     label, returns a dict of features only.
-     *
-     *     configuredColumnsOnly (Optional) If true, only columns provided in
-     *     columnConfigs will be parsed and provided during iteration.
-     *
-     *     delimiter (Optional) The string used to parse each line of the input
-     *     file. Defaults to `,`.
-     */
-    constructor(input, csvConfig) {
-        super();
-        this.input = input;
-        this.hasHeader = true;
-        this.fullColumnNames = null;
-        this.columnNamesValidated = false;
-        this.columnConfigs = null;
-        this.configuredColumnsOnly = false;
-        this.delimiter = ',';
-        this.delimWhitespace = false;
-        this.base = new TextLineDataset(input);
-        if (!csvConfig) {
-            csvConfig = {};
-        }
-        this.hasHeader = csvConfig.hasHeader === false ? false : true;
-        this.fullColumnNames = csvConfig.columnNames;
-        this.columnConfigs = csvConfig.columnConfigs;
-        this.configuredColumnsOnly = csvConfig.configuredColumnsOnly;
-        if (csvConfig.delimWhitespace) {
-            util.assert(csvConfig.delimiter == null, () => 'Delimiter should not be provided when delimWhitespace is true.');
-            this.delimWhitespace = true;
-            this.delimiter = ' ';
-        }
-        else {
-            this.delimiter = csvConfig.delimiter ? csvConfig.delimiter : ',';
-        }
-    }
-    /**
      * Returns column names of the csv dataset. If `configuredColumnsOnly` is
@@ -177,2 +118,61 @@ * true, return column names in `columnConfigs`. If `configuredColumnsOnly` is
     }
+    /**
+     * Create a `CSVDataset`.
+     *
+     * @param input A `DataSource` providing a chunked, UTF8-encoded byte stream.
+     * @param csvConfig (Optional) A CSVConfig object that contains configurations
+     *     of reading and decoding from CSV file(s).
+     *
+     *     hasHeader: (Optional) A boolean value that indicates whether the first
+     *     row of provided CSV file is a header line with column names, and should
+     *     not be included in the data. Defaults to `true`.
+     *
+     *     columnNames: (Optional) A list of strings that corresponds to
+     *     the CSV column names, in order. If provided, it ignores the column
+     *     names inferred from the header row. If not provided, infers the column
+     *     names from the first row of the records. If hasHeader is false and
+     *     columnNames is not provided, this method throws an error.
+     *
+     *     columnConfigs: (Optional) A dictionary whose key is column names, value
+     *     is an object stating if this column is required, column's data type,
+     *     default value, and if this column is label. If provided, keys must
+     *     correspond to names provided in columnNames or inferred from the file
+     *     header lines. If isLabel is true any column, returns an array of two
+     *     items: the first item is a dict of features key/value pairs, the second
+     *     item is a dict of labels key/value pairs. If no feature is marked as
+     *     label, returns a dict of features only.
+     *
+     *     configuredColumnsOnly (Optional) If true, only columns provided in
+     *     columnConfigs will be parsed and provided during iteration.
+     *
+     *     delimiter (Optional) The string used to parse each line of the input
+     *     file. Defaults to `,`.
+     */
+    constructor(input, csvConfig) {
+        super();
+        this.input = input;
+        this.hasHeader = true;
+        this.fullColumnNames = null;
+        this.columnNamesValidated = false;
+        this.columnConfigs = null;
+        this.configuredColumnsOnly = false;
+        this.delimiter = ',';
+        this.delimWhitespace = false;
+        this.base = new TextLineDataset(input);
+        if (!csvConfig) {
+            csvConfig = {};
+        }
+        this.hasHeader = csvConfig.hasHeader === false ? false : true;
+        this.fullColumnNames = csvConfig.columnNames;
+        this.columnConfigs = csvConfig.columnConfigs;
+        this.configuredColumnsOnly = csvConfig.configuredColumnsOnly;
+        if (csvConfig.delimWhitespace) {
+            util.assert(csvConfig.delimiter == null, () => 'Delimiter should not be provided when delimWhitespace is true.');
+            this.delimWhitespace = true;
+            this.delimiter = ' ';
+        }
+        else {
+            this.delimiter = csvConfig.delimiter ? csvConfig.delimiter : ',';
+        }
+    }
     async iterator() {
@@ -381,2 +381,2 @@ if (!this.columnNamesValidated) {
 // tf.data.TFRecordDataset()
-//# 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* @license\n * Copyright 2018 Google LLC. All Rights Reserved.\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n *\n * =============================================================================\n */\n\nimport {TensorContainer, util} from '@tensorflow/tfjs-core';\nimport {Dataset} from '../dataset';\nimport {DataSource} from '../datasource';\nimport {LazyIterator} from '../iterators/lazy_iterator';\nimport {ColumnConfig, CSVConfig} from '../types';\nimport {TextLineDataset} from './text_line_dataset';\n\nconst CODE_QUOTE = '\"';\nconst STATE_OUT = Symbol('out');\nconst STATE_FIELD = Symbol('field');\nconst STATE_QUOTE = Symbol('quote');\nconst STATE_QUOTE_AFTER_QUOTE = Symbol('quoteafterquote');\nconst STATE_WITHIN_QUOTE_IN_QUOTE = Symbol('quoteinquote');\n\n/**\n * Represents a potentially large collection of delimited text records.\n *\n * The produced `TensorContainer`s each contain one key-value pair for\n * every column of the table.  When a field is empty in the incoming data, the\n * resulting value is `undefined`, or throw error if it is required.  Values\n * that can be parsed as numbers are emitted as type `number`, other values\n * are parsed as `string`.\n *\n * The results are not batched.\n *\n * @doc {heading: 'Data', subheading: 'Classes', namespace: 'data'}\n */\nexport class CSVDataset extends Dataset<TensorContainer> {\n  base: TextLineDataset;\n  private hasHeader = true;\n  private fullColumnNames: string[] = null;\n  private columnNamesValidated = false;\n  private columnConfigs: {[key: string]: ColumnConfig} = null;\n  private configuredColumnsOnly = false;\n  private delimiter = ',';\n  private delimWhitespace = false;\n\n  /**\n   * Returns column names of the csv dataset. If `configuredColumnsOnly` is\n   * true, return column names in `columnConfigs`. If `configuredColumnsOnly` is\n   * false and `columnNames` is provided, `columnNames`. If\n   * `configuredColumnsOnly` is false and `columnNames` is not provided, return\n   * all column names parsed from the csv file. For example usage please go to\n   * `tf.data.csv`.\n   *\n   * @doc {heading: 'Data', subheading: 'Classes'}\n   */\n  async columnNames() {\n    if (!this.columnNamesValidated) {\n      await this.setColumnNames();\n    }\n    return this.configuredColumnsOnly ? Object.keys(this.columnConfigs) :\n                                        this.fullColumnNames;\n  }\n\n  /* 1) If `columnNames` is provided as string[], use this string[] as output\n   * keys in corresponding order. The length must match the number of inferred\n   * columns if `hasHeader` is true .\n   * 2) If `columnNames` is not provided, parse header line as `columnNames` if\n   * hasHeader is true. If `hasHeader` is false, throw an error.\n   * 3) If `columnConfigs` is provided, all the keys in `columnConfigs` must\n   * exist in parsed `columnNames`.\n   */\n  private async setColumnNames() {\n    const columnNamesFromFile = await this.maybeReadHeaderLine();\n    if (!this.fullColumnNames && !columnNamesFromFile) {\n      // Throw an error if columnNames is not provided and no header line.\n      throw new Error(\n          'Column names must be provided if there is no header line.');\n    } else if (this.fullColumnNames && columnNamesFromFile) {\n      // Check provided columnNames match header line.\n      util.assert(\n          columnNamesFromFile.length === this.fullColumnNames.length,\n          () => 'The length of provided columnNames (' +\n              this.fullColumnNames.length.toString() +\n              ') does not match the length of the header line read from ' +\n              'file (' + columnNamesFromFile.length.toString() + ').');\n    }\n    if (!this.fullColumnNames) {\n      this.fullColumnNames = columnNamesFromFile;\n    }\n    // Check if there are duplicate column names.\n    const counts: {[key: string]: number} = this.fullColumnNames.reduce(\n        (countAcc: {[key: string]: number}, name) => {\n          countAcc[name] = (countAcc[name] + 1) || 1;\n          return countAcc;\n        },\n        {});\n    const duplicateNames =\n        Object.keys(counts).filter((name) => (counts[name] > 1));\n    util.assert(\n        duplicateNames.length === 0,\n        () => 'Duplicate column names found: ' + duplicateNames.toString());\n    // Check if keys in columnConfigs match columnNames.\n    if (this.columnConfigs) {\n      for (const key of Object.keys(this.columnConfigs)) {\n        const index = this.fullColumnNames.indexOf(key);\n        if (index === -1) {\n          throw new Error(\n              'The key \"' + key +\n              '\" provided in columnConfigs does not match any of the column ' +\n              'names (' + this.fullColumnNames.toString() + ').');\n        }\n      }\n    }\n    this.columnNamesValidated = true;\n  }\n\n  private async maybeReadHeaderLine() {\n    if (this.hasHeader) {\n      const iter = await this.base.iterator();\n      const firstElement = await iter.next();\n      if (firstElement.done) {\n        throw new Error('No data was found for CSV parsing.');\n      }\n      const firstLine: string = firstElement.value;\n      const headers = this.parseRow(firstLine, false);\n      return headers;\n    } else {\n      return null;\n    }\n  }\n\n  /**\n   * Create a `CSVDataset`.\n   *\n   * @param input A `DataSource` providing a chunked, UTF8-encoded byte stream.\n   * @param csvConfig (Optional) A CSVConfig object that contains configurations\n   *     of reading and decoding from CSV file(s).\n   *\n   *     hasHeader: (Optional) A boolean value that indicates whether the first\n   *     row of provided CSV file is a header line with column names, and should\n   *     not be included in the data. Defaults to `true`.\n   *\n   *     columnNames: (Optional) A list of strings that corresponds to\n   *     the CSV column names, in order. If provided, it ignores the column\n   *     names inferred from the header row. If not provided, infers the column\n   *     names from the first row of the records. If hasHeader is false and\n   *     columnNames is not provided, this method throws an error.\n   *\n   *     columnConfigs: (Optional) A dictionary whose key is column names, value\n   *     is an object stating if this column is required, column's data type,\n   *     default value, and if this column is label. If provided, keys must\n   *     correspond to names provided in columnNames or inferred from the file\n   *     header lines. If isLabel is true any column, returns an array of two\n   *     items: the first item is a dict of features key/value pairs, the second\n   *     item is a dict of labels key/value pairs. If no feature is marked as\n   *     label, returns a dict of features only.\n   *\n   *     configuredColumnsOnly (Optional) If true, only columns provided in\n   *     columnConfigs will be parsed and provided during iteration.\n   *\n   *     delimiter (Optional) The string used to parse each line of the input\n   *     file. Defaults to `,`.\n   */\n  constructor(protected readonly input: DataSource, csvConfig?: CSVConfig) {\n    super();\n    this.base = new TextLineDataset(input);\n    if (!csvConfig) {\n      csvConfig = {};\n    }\n    this.hasHeader = csvConfig.hasHeader === false ? false : true;\n    this.fullColumnNames = csvConfig.columnNames;\n    this.columnConfigs = csvConfig.columnConfigs;\n    this.configuredColumnsOnly = csvConfig.configuredColumnsOnly;\n    if (csvConfig.delimWhitespace) {\n      util.assert(\n          csvConfig.delimiter == null,\n          () =>\n              'Delimiter should not be provided when delimWhitespace is true.');\n      this.delimWhitespace = true;\n      this.delimiter = ' ';\n    } else {\n      this.delimiter = csvConfig.delimiter ? csvConfig.delimiter : ',';\n    }\n  }\n\n  async iterator(): Promise<LazyIterator<TensorContainer>> {\n    if (!this.columnNamesValidated) {\n      await this.setColumnNames();\n    }\n    let lines = await this.base.iterator();\n    if (this.hasHeader) {\n      // We previously read the first line to get the columnNames.\n      // Now that we're providing data, skip it.\n      lines = lines.skip(1);\n    }\n    return lines.map(x => this.makeDataElement(x));\n  }\n\n  makeDataElement(line: string): TensorContainer {\n    const values = this.parseRow(line);\n    const features: {[key: string]: TensorContainer} = {};\n    const labels: {[key: string]: TensorContainer} = {};\n\n    for (let i = 0; i < this.fullColumnNames.length; i++) {\n      const key = this.fullColumnNames[i];\n      const config = this.columnConfigs ? this.columnConfigs[key] : null;\n      if (this.configuredColumnsOnly && !config) {\n        // This column is not selected.\n        continue;\n      } else {\n        const value = values[i];\n        let parsedValue = null;\n        if (value === '') {\n          // If default value is provided, use it. If default value is not\n          // provided, set as undefined.\n          if (config && config.default !== undefined) {\n            parsedValue = config.default;\n          } else if (config && (config.required || config.isLabel)) {\n            throw new Error(\n                `Required column ${key} is empty in this line: ${line}`);\n          } else {\n            parsedValue = undefined;\n          }\n        } else {\n          // A value is present, so parse it based on type\n          const valueAsNum = Number(value);\n          if (isNaN(valueAsNum)) {\n            // The value is a string and this column is declared as boolean\n            // in config, parse it as boolean.\n            if (config && config.dtype === 'bool') {\n              parsedValue = this.getBoolean(value);\n            } else {\n              // Set value as string\n              parsedValue = value;\n            }\n          } else if (!config || !config.dtype) {\n            // If this value is a number and no type config is provided, return\n            // it as number.\n            parsedValue = valueAsNum;\n          } else {\n            // If this value is a number and data type is provided, parse it\n            // according to provided data type.\n            switch (config.dtype) {\n              case 'float32':\n                parsedValue = valueAsNum;\n                break;\n              case 'int32':\n                parsedValue = Math.floor(valueAsNum);\n                break;\n              case 'bool':\n                parsedValue = this.getBoolean(value);\n                break;\n              default:\n                parsedValue = valueAsNum;\n            }\n          }\n        }\n        // Check if this column is label.\n        (config && config.isLabel) ? labels[key] = parsedValue :\n                                     features[key] = parsedValue;\n      }\n    }\n    // If label exists, return an object of features and labels as {xs:features,\n    // ys:labels}, otherwise return features only.\n    if (Object.keys(labels).length === 0) {\n      return features;\n\n    } else {\n      return {xs: features, ys: labels};\n    }\n  }\n\n  private getBoolean(value: string): number {\n    if (value === '1' || value.toLowerCase() === 'true') {\n      return 1;\n    } else {\n      return 0;\n    }\n  }\n\n  // adapted from https://beta.observablehq.com/@mbostock/streaming-csv\n  private parseRow(line: string, validateElementCount = true): string[] {\n    const result: string[] = [];\n    let readOffset = 0;\n    const readLength = line.length;\n    let currentState = STATE_OUT;\n    // Goes through the line to parse quote.\n    for (let i = 0; i < readLength; i++) {\n      switch (currentState) {\n        // Before enter a new field\n        case STATE_OUT:\n          switch (line.charAt(i)) {\n            // Enter a quoted field\n            case CODE_QUOTE:\n              readOffset = i + 1;\n              currentState = STATE_QUOTE;\n              break;\n            // Read an empty field\n            case this.delimiter:\n              readOffset = i + 1;\n              // If delimiter is white space and configured to collapse\n              // multiple white spaces, ignore this white space.\n              if (this.delimiter === ' ' && this.delimWhitespace) {\n                break;\n              }\n              result.push('');\n              currentState = STATE_OUT;\n              break;\n            // Enter an unquoted field\n            default:\n              currentState = STATE_FIELD;\n              readOffset = i;\n              break;\n          }\n          break;\n        // In an unquoted field\n        case STATE_FIELD:\n          switch (line.charAt(i)) {\n            // Exit an unquoted field, add it to result\n            case this.delimiter:\n              result.push(line.substring(readOffset, i));\n              currentState = STATE_OUT;\n              readOffset = i + 1;\n              break;\n            default:\n          }\n          break;\n        // In a quoted field\n        case STATE_QUOTE:\n          switch (line.charAt(i)) {\n            // Read a quote after a quote\n            case CODE_QUOTE:\n              currentState = STATE_QUOTE_AFTER_QUOTE;\n              break;\n            default:\n          }\n          break;\n        // This state means it's right after a second quote in a field\n        case STATE_QUOTE_AFTER_QUOTE:\n          switch (line.charAt(i)) {\n            // Finished a quoted field\n            case this.delimiter:\n              result.push(line.substring(readOffset, i - 1));\n              currentState = STATE_OUT;\n              readOffset = i + 1;\n              break;\n            // Finished a quoted part in a quoted field\n            case CODE_QUOTE:\n              currentState = STATE_QUOTE;\n              break;\n            // In a quoted part in a quoted field\n            default:\n              currentState = STATE_WITHIN_QUOTE_IN_QUOTE;\n              break;\n          }\n          break;\n        case STATE_WITHIN_QUOTE_IN_QUOTE:\n          switch (line.charAt(i)) {\n            // Exit a quoted part in a quoted field\n            case CODE_QUOTE:\n              currentState = STATE_QUOTE;\n              break;\n            default:\n          }\n          break;\n        default:\n      }\n    }\n    // Adds last item based on if it is quoted.\n    if (currentState === STATE_QUOTE_AFTER_QUOTE) {\n      result.push(line.substring(readOffset, readLength - 1));\n    } else {\n      result.push(line.substring(readOffset));\n    }\n    // Check if each row has the same number of elements as column names.\n    if (validateElementCount && result.length !== this.fullColumnNames.length) {\n      throw new Error(`Invalid row in csv file. Should have ${\n          this.fullColumnNames.length} elements in a row, but got ${result}`);\n    }\n    return result;\n  }\n}\n\n// TODO(soergel): add more basic datasets for parity with tf.data\n// tf.data.FixedLengthRecordDataset()\n// tf.data.TFRecordDataset()\n"]}
+//# 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* @license\n * Copyright 2018 Google LLC. All Rights Reserved.\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n *\n * =============================================================================\n */\n\nimport {TensorContainer, util} from '@tensorflow/tfjs-core';\nimport {Dataset} from '../dataset';\nimport {DataSource} from '../datasource';\nimport {LazyIterator} from '../iterators/lazy_iterator';\nimport {ColumnConfig, CSVConfig} from '../types';\nimport {TextLineDataset} from './text_line_dataset';\n\nconst CODE_QUOTE = '\"';\nconst STATE_OUT = Symbol('out');\nconst STATE_FIELD = Symbol('field');\nconst STATE_QUOTE = Symbol('quote');\nconst STATE_QUOTE_AFTER_QUOTE = Symbol('quoteafterquote');\nconst STATE_WITHIN_QUOTE_IN_QUOTE = Symbol('quoteinquote');\n\n/**\n * Represents a potentially large collection of delimited text records.\n *\n * The produced `TensorContainer`s each contain one key-value pair for\n * every column of the table.  When a field is empty in the incoming data, the\n * resulting value is `undefined`, or throw error if it is required.  Values\n * that can be parsed as numbers are emitted as type `number`, other values\n * are parsed as `string`.\n *\n * The results are not batched.\n *\n * @doc {heading: 'Data', subheading: 'Classes', namespace: 'data'}\n */\nexport class CSVDataset extends Dataset<TensorContainer> {\n  base: TextLineDataset;\n  private hasHeader = true;\n  private fullColumnNames: string[] = null;\n  private columnNamesValidated = false;\n  private columnConfigs: {[key: string]: ColumnConfig} = null;\n  private configuredColumnsOnly = false;\n  private delimiter = ',';\n  private delimWhitespace = false;\n\n  /**\n   * Returns column names of the csv dataset. If `configuredColumnsOnly` is\n   * true, return column names in `columnConfigs`. If `configuredColumnsOnly` is\n   * false and `columnNames` is provided, `columnNames`. If\n   * `configuredColumnsOnly` is false and `columnNames` is not provided, return\n   * all column names parsed from the csv file. For example usage please go to\n   * `tf.data.csv`.\n   *\n   * @doc {heading: 'Data', subheading: 'Classes'}\n   */\n  async columnNames() {\n    if (!this.columnNamesValidated) {\n      await this.setColumnNames();\n    }\n    return this.configuredColumnsOnly ? Object.keys(this.columnConfigs) :\n                                        this.fullColumnNames;\n  }\n\n  /* 1) If `columnNames` is provided as string[], use this string[] as output\n   * keys in corresponding order. The length must match the number of inferred\n   * columns if `hasHeader` is true .\n   * 2) If `columnNames` is not provided, parse header line as `columnNames` if\n   * hasHeader is true. If `hasHeader` is false, throw an error.\n   * 3) If `columnConfigs` is provided, all the keys in `columnConfigs` must\n   * exist in parsed `columnNames`.\n   */\n  private async setColumnNames() {\n    const columnNamesFromFile = await this.maybeReadHeaderLine();\n    if (!this.fullColumnNames && !columnNamesFromFile) {\n      // Throw an error if columnNames is not provided and no header line.\n      throw new Error(\n          'Column names must be provided if there is no header line.');\n    } else if (this.fullColumnNames && columnNamesFromFile) {\n      // Check provided columnNames match header line.\n      util.assert(\n          columnNamesFromFile.length === this.fullColumnNames.length,\n          () => 'The length of provided columnNames (' +\n              this.fullColumnNames.length.toString() +\n              ') does not match the length of the header line read from ' +\n              'file (' + columnNamesFromFile.length.toString() + ').');\n    }\n    if (!this.fullColumnNames) {\n      this.fullColumnNames = columnNamesFromFile;\n    }\n    // Check if there are duplicate column names.\n    const counts: {[key: string]: number} = this.fullColumnNames.reduce(\n        (countAcc: {[key: string]: number}, name) => {\n          countAcc[name] = (countAcc[name] + 1) || 1;\n          return countAcc;\n        },\n        {});\n    const duplicateNames =\n        Object.keys(counts).filter((name) => (counts[name] > 1));\n    util.assert(\n        duplicateNames.length === 0,\n        () => 'Duplicate column names found: ' + duplicateNames.toString());\n    // Check if keys in columnConfigs match columnNames.\n    if (this.columnConfigs) {\n      for (const key of Object.keys(this.columnConfigs)) {\n        const index = this.fullColumnNames.indexOf(key);\n        if (index === -1) {\n          throw new Error(\n              'The key \"' + key +\n              '\" provided in columnConfigs does not match any of the column ' +\n              'names (' + this.fullColumnNames.toString() + ').');\n        }\n      }\n    }\n    this.columnNamesValidated = true;\n  }\n\n  private async maybeReadHeaderLine() {\n    if (this.hasHeader) {\n      const iter = await this.base.iterator();\n      const firstElement = await iter.next();\n      if (firstElement.done) {\n        throw new Error('No data was found for CSV parsing.');\n      }\n      const firstLine: string = firstElement.value;\n      const headers = this.parseRow(firstLine, false);\n      return headers;\n    } else {\n      return null;\n    }\n  }\n\n  /**\n   * Create a `CSVDataset`.\n   *\n   * @param input A `DataSource` providing a chunked, UTF8-encoded byte stream.\n   * @param csvConfig (Optional) A CSVConfig object that contains configurations\n   *     of reading and decoding from CSV file(s).\n   *\n   *     hasHeader: (Optional) A boolean value that indicates whether the first\n   *     row of provided CSV file is a header line with column names, and should\n   *     not be included in the data. Defaults to `true`.\n   *\n   *     columnNames: (Optional) A list of strings that corresponds to\n   *     the CSV column names, in order. If provided, it ignores the column\n   *     names inferred from the header row. If not provided, infers the column\n   *     names from the first row of the records. If hasHeader is false and\n   *     columnNames is not provided, this method throws an error.\n   *\n   *     columnConfigs: (Optional) A dictionary whose key is column names, value\n   *     is an object stating if this column is required, column's data type,\n   *     default value, and if this column is label. If provided, keys must\n   *     correspond to names provided in columnNames or inferred from the file\n   *     header lines. If isLabel is true any column, returns an array of two\n   *     items: the first item is a dict of features key/value pairs, the second\n   *     item is a dict of labels key/value pairs. If no feature is marked as\n   *     label, returns a dict of features only.\n   *\n   *     configuredColumnsOnly (Optional) If true, only columns provided in\n   *     columnConfigs will be parsed and provided during iteration.\n   *\n   *     delimiter (Optional) The string used to parse each line of the input\n   *     file. Defaults to `,`.\n   */\n  constructor(protected readonly input: DataSource, csvConfig?: CSVConfig) {\n    super();\n    this.base = new TextLineDataset(input);\n    if (!csvConfig) {\n      csvConfig = {};\n    }\n    this.hasHeader = csvConfig.hasHeader === false ? false : true;\n    this.fullColumnNames = csvConfig.columnNames;\n    this.columnConfigs = csvConfig.columnConfigs;\n    this.configuredColumnsOnly = csvConfig.configuredColumnsOnly;\n    if (csvConfig.delimWhitespace) {\n      util.assert(\n          csvConfig.delimiter == null,\n          () =>\n              'Delimiter should not be provided when delimWhitespace is true.');\n      this.delimWhitespace = true;\n      this.delimiter = ' ';\n    } else {\n      this.delimiter = csvConfig.delimiter ? csvConfig.delimiter : ',';\n    }\n  }\n\n  async iterator(): Promise<LazyIterator<TensorContainer>> {\n    if (!this.columnNamesValidated) {\n      await this.setColumnNames();\n    }\n    let lines = await this.base.iterator();\n    if (this.hasHeader) {\n      // We previously read the first line to get the columnNames.\n      // Now that we're providing data, skip it.\n      lines = lines.skip(1);\n    }\n    return lines.map(x => this.makeDataElement(x));\n  }\n\n  makeDataElement(line: string): TensorContainer {\n    const values = this.parseRow(line);\n    const features: {[key: string]: TensorContainer} = {};\n    const labels: {[key: string]: TensorContainer} = {};\n\n    for (let i = 0; i < this.fullColumnNames.length; i++) {\n      const key = this.fullColumnNames[i];\n      const config = this.columnConfigs ? this.columnConfigs[key] : null;\n      if (this.configuredColumnsOnly && !config) {\n        // This column is not selected.\n        continue;\n      } else {\n        const value = values[i];\n        let parsedValue = null;\n        if (value === '') {\n          // If default value is provided, use it. If default value is not\n          // provided, set as undefined.\n          if (config && config.default !== undefined) {\n            parsedValue = config.default;\n          } else if (config && (config.required || config.isLabel)) {\n            throw new Error(\n                `Required column ${key} is empty in this line: ${line}`);\n          } else {\n            parsedValue = undefined;\n          }\n        } else {\n          // A value is present, so parse it based on type\n          const valueAsNum = Number(value);\n          if (isNaN(valueAsNum)) {\n            // The value is a string and this column is declared as boolean\n            // in config, parse it as boolean.\n            if (config && config.dtype === 'bool') {\n              parsedValue = this.getBoolean(value);\n            } else {\n              // Set value as string\n              parsedValue = value;\n            }\n          } else if (!config || !config.dtype) {\n            // If this value is a number and no type config is provided, return\n            // it as number.\n            parsedValue = valueAsNum;\n          } else {\n            // If this value is a number and data type is provided, parse it\n            // according to provided data type.\n            switch (config.dtype) {\n              case 'float32':\n                parsedValue = valueAsNum;\n                break;\n              case 'int32':\n                parsedValue = Math.floor(valueAsNum);\n                break;\n              case 'bool':\n                parsedValue = this.getBoolean(value);\n                break;\n              default:\n                parsedValue = valueAsNum;\n            }\n          }\n        }\n        // Check if this column is label.\n        (config && config.isLabel) ? labels[key] = parsedValue :\n                                     features[key] = parsedValue;\n      }\n    }\n    // If label exists, return an object of features and labels as {xs:features,\n    // ys:labels}, otherwise return features only.\n    if (Object.keys(labels).length === 0) {\n      return features;\n\n    } else {\n      return {xs: features, ys: labels};\n    }\n  }\n\n  private getBoolean(value: string): number {\n    if (value === '1' || value.toLowerCase() === 'true') {\n      return 1;\n    } else {\n      return 0;\n    }\n  }\n\n  // adapted from https://beta.observablehq.com/@mbostock/streaming-csv\n  private parseRow(line: string, validateElementCount = true): string[] {\n    const result: string[] = [];\n    let readOffset = 0;\n    const readLength = line.length;\n    let currentState = STATE_OUT;\n    // Goes through the line to parse quote.\n    for (let i = 0; i < readLength; i++) {\n      switch (currentState) {\n        // Before enter a new field\n        case STATE_OUT:\n          switch (line.charAt(i)) {\n            // Enter a quoted field\n            case CODE_QUOTE:\n              readOffset = i + 1;\n              currentState = STATE_QUOTE;\n              break;\n            // Read an empty field\n            case this.delimiter:\n              readOffset = i + 1;\n              // If delimiter is white space and configured to collapse\n              // multiple white spaces, ignore this white space.\n              if (this.delimiter === ' ' && this.delimWhitespace) {\n                break;\n              }\n              result.push('');\n              currentState = STATE_OUT;\n              break;\n            // Enter an unquoted field\n            default:\n              currentState = STATE_FIELD;\n              readOffset = i;\n              break;\n          }\n          break;\n        // In an unquoted field\n        case STATE_FIELD:\n          switch (line.charAt(i)) {\n            // Exit an unquoted field, add it to result\n            case this.delimiter:\n              result.push(line.substring(readOffset, i));\n              currentState = STATE_OUT;\n              readOffset = i + 1;\n              break;\n            default:\n          }\n          break;\n        // In a quoted field\n        case STATE_QUOTE:\n          switch (line.charAt(i)) {\n            // Read a quote after a quote\n            case CODE_QUOTE:\n              currentState = STATE_QUOTE_AFTER_QUOTE;\n              break;\n            default:\n          }\n          break;\n        // This state means it's right after a second quote in a field\n        case STATE_QUOTE_AFTER_QUOTE:\n          switch (line.charAt(i)) {\n            // Finished a quoted field\n            case this.delimiter:\n              result.push(line.substring(readOffset, i - 1));\n              currentState = STATE_OUT;\n              readOffset = i + 1;\n              break;\n            // Finished a quoted part in a quoted field\n            case CODE_QUOTE:\n              currentState = STATE_QUOTE;\n              break;\n            // In a quoted part in a quoted field\n            default:\n              currentState = STATE_WITHIN_QUOTE_IN_QUOTE;\n              break;\n          }\n          break;\n        case STATE_WITHIN_QUOTE_IN_QUOTE:\n          switch (line.charAt(i)) {\n            // Exit a quoted part in a quoted field\n            case CODE_QUOTE:\n              currentState = STATE_QUOTE;\n              break;\n            default:\n          }\n          break;\n        default:\n      }\n    }\n    // Adds last item based on if it is quoted.\n    if (currentState === STATE_QUOTE_AFTER_QUOTE) {\n      result.push(line.substring(readOffset, readLength - 1));\n    } else {\n      result.push(line.substring(readOffset));\n    }\n    // Check if each row has the same number of elements as column names.\n    if (validateElementCount && result.length !== this.fullColumnNames.length) {\n      throw new Error(`Invalid row in csv file. Should have ${\n          this.fullColumnNames.length} elements in a row, but got ${result}`);\n    }\n    return result;\n  }\n}\n\n// TODO(soergel): add more basic datasets for parity with tf.data\n// tf.data.FixedLengthRecordDataset()\n// tf.data.TFRecordDataset()\n"]}

dist/iterators/lazy_iterator.d.ts

@@ -26,3 +26,3 @@ /**
  */
-export declare type IteratorContainer = Container<LazyIterator<tf.TensorContainer>>;
+export type IteratorContainer = Container<LazyIterator<tf.TensorContainer>>;
 /**
@@ -29,0 +29,0 @@ * Create a `LazyIterator` from an array of items.

dist/miniprogram/index.js

@@ -17,3 +17,3 @@ /**
  */
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o(e,t),e.prototype.next=function(){return u(this,void 0,void 0,(function(){var t=this;return s(this,(function(e){return this.lastRead=this.lastRead.then((function(){return t.serialNext()})),[2,this.lastRead]}))}))},e.prototype.randomInt=function(t){return Math.floor(this.random()*t)},e.prototype.chooseIndex=function(){return this.randomInt(this.buffer.length())},e.prototype.serialNext=function(){return u(this,void 0,void 0,(function(){var t,e;return s(this,(function(n){switch(n.label){case 0:this.upstreamExhausted||this.refill(),n.label=1;case 1:return this.buffer.isEmpty()?[3,3]:(t=this.chooseIndex(),[4,this.buffer.shuffleExcise(t)]);case 2:return(e=n.sent()).done?(this.upstreamExhausted=!0,[3,1]):(this.refill(),[2,e]);case 3:return[2,{value:null,done:!0}]}}))}))},e}(Y),$=function(){function t(){this.size=null}return t.prototype.batch=function(t,e){var n=this;void 0===e&&(e=!0);var i=this;return r.util.assert(t>0,(function(){return"batchSize needs to be positive, but it is\n      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o=this.fullColumnNames[i],u=this.columnConfigs?this.columnConfigs[o]:null;if(!this.configuredColumnsOnly||u){var s=e[i],a=null;if(""===s)if(u&&void 0!==u.default)a=u.default;else{if(u&&(u.required||u.isLabel))throw new Error("Required column ".concat(o," is empty in this line: ").concat(t));a=void 0}else{var c=Number(s);if(isNaN(c))a=u&&"bool"===u.dtype?this.getBoolean(s):s;else if(u&&u.dtype)switch(u.dtype){case"float32":default:a=c;break;case"int32":a=Math.floor(c);break;case"bool":a=this.getBoolean(s)}else a=c}u&&u.isLabel?r[o]=a:n[o]=a}}return 0===Object.keys(r).length?n:{xs:n,ys:r}},n.prototype.getBoolean=function(t){return"1"===t||"true"===t.toLowerCase()?1:0},n.prototype.parseRow=function(t,e){void 0===e&&(e=!0);for(var n=[],r=0,i=t.length,o=it,u=0;u<i;u++)switch(o){case it:switch(t.charAt(u)){case rt:r=u+1,o=ut;break;case this.delimiter:if(r=u+1," "===this.delimiter&&this.delimWhitespace)break;n.push(""),o=it;break;default:o=ot,r=u}break;case ot:if(t.charAt(u)===this.delimiter)n.push(t.substring(r,u)),o=it,r=u+1;break;case ut:if(t.charAt(u)===rt)o=st;break;case st:switch(t.charAt(u)){case this.delimiter:n.push(t.substring(r,u-1)),o=it,r=u+1;break;case rt:o=ut;break;default:o=at}break;case at:if(t.charAt(u)===rt)o=ut}if(o===st?n.push(t.substring(r,i-1)):n.push(t.substring(r)),e&&n.length!==this.fullColumnNames.length)throw new Error("Invalid row in csv file. 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there is no header line.");if(this.fullColumnNames&&t&&e.util.assert(t.length===this.fullColumnNames.length,(function(){return"The length of provided columnNames ("+f.fullColumnNames.length.toString()+") does not match the length of the header line read from file ("+t.length.toString()+")."})),this.fullColumnNames||(this.fullColumnNames=t),n=this.fullColumnNames.reduce((function(t,e){return t[e]=t[e]+1||1,t}),{}),r=Object.keys(n).filter((function(t){return n[t]>1})),e.util.assert(0===r.length,(function(){return"Duplicate column names found: "+r.toString()})),this.columnConfigs)try{for(i=a(Object.keys(this.columnConfigs)),o=i.next();!o.done;o=i.next())if(u=o.value,-1===this.fullColumnNames.indexOf(u))throw new Error('The key "'+u+'" provided in columnConfigs does not match any of the column names ('+this.fullColumnNames.toString()+").")}catch(t){c={error:t}}finally{try{o&&!o.done&&(l=i.return)&&l.call(i)}finally{if(c)throw c.error}}return this.columnNamesValidated=!0,[2]}}))}))},n.prototype.maybeReadHeaderLine=function(){return u(this,void 0,void 0,(function(){var t,e;return s(this,(function(n){switch(n.label){case 0:return this.hasHeader?[4,this.base.iterator()]:[3,3];case 1:return[4,n.sent().next()];case 2:if((t=n.sent()).done)throw new Error("No data was found for CSV parsing.");return e=t.value,[2,this.parseRow(e,!1)];case 3:return[2,null]}}))}))},n.prototype.iterator=function(){return u(this,void 0,void 0,(function(){var t,e=this;return s(this,(function(n){switch(n.label){case 0:return this.columnNamesValidated?[3,2]:[4,this.setColumnNames()];case 1:n.sent(),n.label=2;case 2:return[4,this.base.iterator()];case 3:return t=n.sent(),this.hasHeader&&(t=t.skip(1)),[2,t.map((function(t){return e.makeDataElement(t)}))]}}))}))},n.prototype.makeDataElement=function(t){for(var e=this.parseRow(t),n={},r={},i=0;i<this.fullColumnNames.length;i++){var o=this.fullColumnNames[i],u=this.columnConfigs?this.columnConfigs[o]:null;if(!this.configuredColumnsOnly||u){var s=e[i],a=null;if(""===s)if(u&&void 0!==u.default)a=u.default;else{if(u&&(u.required||u.isLabel))throw new Error("Required column ".concat(o," is empty in this line: ").concat(t));a=void 0}else{var c=Number(s);if(isNaN(c))a=u&&"bool"===u.dtype?this.getBoolean(s):s;else if(u&&u.dtype)switch(u.dtype){case"float32":default:a=c;break;case"int32":a=Math.floor(c);break;case"bool":a=this.getBoolean(s)}else a=c}u&&u.isLabel?r[o]=a:n[o]=a}}return 0===Object.keys(r).length?n:{xs:n,ys:r}},n.prototype.getBoolean=function(t){return"1"===t||"true"===t.toLowerCase()?1:0},n.prototype.parseRow=function(t,e){void 0===e&&(e=!0);for(var n=[],r=0,i=t.length,o=it,u=0;u<i;u++)switch(o){case it:switch(t.charAt(u)){case rt:r=u+1,o=ut;break;case this.delimiter:if(r=u+1," "===this.delimiter&&this.delimWhitespace)break;n.push(""),o=it;break;default:o=ot,r=u}break;case ot:if(t.charAt(u)===this.delimiter)n.push(t.substring(r,u)),o=it,r=u+1;break;case ut:if(t.charAt(u)===rt)o=st;break;case st:switch(t.charAt(u)){case this.delimiter:n.push(t.substring(r,u-1)),o=it,r=u+1;break;case rt:o=ut;break;default:o=at}break;case at:if(t.charAt(u)===rt)o=ut}if(o===st?n.push(t.substring(r,i-1)):n.push(t.substring(r)),e&&n.length!==this.fullColumnNames.length)throw new Error("Invalid row in csv file. Should have ".concat(this.fullColumnNames.length," elements in a row, but got ").concat(n));return n},n}($),lt=function(t){function n(e){var n=t.call(this)||this;n.microphoneConfig=e,n.isClosed=!1,n.fftSize=e.fftSize||1024;var r=Math.log2(n.fftSize);if(n.fftSize<0||r<4||r>14||!Number.isInteger(r))throw new Error("Invalid fftSize: it must be a power of 2 between "+"2 to 4 and 2 to 14, but got ".concat(n.fftSize));if(n.numFrames=e.numFramesPerSpectrogram||43,n.sampleRateHz=e.sampleRateHz,n.columnTruncateLength=e.columnTruncateLength||n.fftSize,n.audioTrackConstraints=e.audioTrackConstraints,n.smoothingTimeConstant=e.smoothingTimeConstant||0,n.includeSpectrogram=!1!==e.includeSpectrogram,n.includeWaveform=!0===e.includeWaveform,!n.includeSpectrogram&&!n.includeWaveform)throw new Error("Both includeSpectrogram and includeWaveform are false. At least one type of data should be returned.");return n}return o(n,t),n.prototype.summary=function(){return"microphone"},n.create=function(t){return void 0===t&&(t={}),u(this,void 0,void 0,(function(){var r;return s(this,(function(i){switch(i.label){case 0:if(!e.env().get("IS_BROWSER"))throw new Error("microphone API is only supported in browser environment.");return[4,(r=new n(t)).start()];case 1:return i.sent(),[2,r]}}))}))},n.prototype.start=function(){return u(this,void 0,void 0,(function(){var t,e,n,r;return s(this,(function(i){switch(i.label){case 0:return i.trys.push([0,2,,3]),t=this,[4,navigator.mediaDevices.getUserMedia({audio:null==this.audioTrackConstraints||this.audioTrackConstraints,video:!1})];case 1:return t.stream=i.sent(),[3,3];case 2:throw e=i.sent(),new Error("Error thrown while initializing video stream: ".concat(e.message));case 3:if(!this.stream)throw new Error("Could not obtain audio from microphone.");if(n=window.AudioContext||window.webkitAudioContext,this.audioContext=new n,this.sampleRateHz){if(this.audioContext.sampleRate!==this.sampleRateHz)throw new Error("Mismatch in sampling rate: "+"Expected: ".concat(this.sampleRateHz,"; ")+"Actual: ".concat(this.audioContext.sampleRate))}else this.sampleRateHz=this.audioContext.sampleRate;return r=this.audioContext.createMediaStreamSource(this.stream),this.analyser=this.audioContext.createAnalyser(),this.analyser.fftSize=2*this.fftSize,this.analyser.smoothingTimeConstant=this.smoothingTimeConstant,r.connect(this.analyser),this.freqData=new Float32Array(this.fftSize),this.timeData=new Float32Array(this.fftSize),[2]}}))}))},n.prototype.next=function(){return u(this,void 0,void 0,(function(){var t,e,n,r,i;return s(this,(function(o){switch(o.label){case 0:return this.isClosed?[2,{value:null,done:!0}]:[4,this.getAudioData()];case 1:return n=o.sent(),this.includeSpectrogram&&(r=this.flattenQueue(n.freqDataQueue),t=this.getTensorFromAudioDataArray(r,[this.numFrames,this.columnTruncateLength,1])),this.includeWaveform&&(i=this.flattenQueue(n.timeDataQueue),e=this.getTensorFromAudioDataArray(i,[this.numFrames*this.fftSize,1])),[2,{value:{spectrogram:t,waveform:e},done:!1}]}}))}))},n.prototype.capture=function(){return u(this,void 0,void 0,(function(){return s(this,(function(t){switch(t.label){case 0:return[4,this.next()];case 1:return[2,t.sent().value]}}))}))},n.prototype.getAudioData=function(){return u(this,void 0,void 0,(function(){var t,e,n,r=this;return s(this,(function(i){return t=[],e=[],n=0,[2,new Promise((function(i){var o=setInterval((function(){r.includeSpectrogram&&(r.analyser.getFloatFrequencyData(r.freqData),r.freqData[0]===-1/0&&i({freqDataQueue:t,timeDataQueue:e}),t.push(r.freqData.slice(0,r.columnTruncateLength))),r.includeWaveform&&(r.analyser.getFloatTimeDomainData(r.timeData),e.push(r.timeData.slice())),++n===r.numFrames&&(clearInterval(o),i({freqDataQueue:t,timeDataQueue:e}))}),r.fftSize/r.sampleRateHz*1e3)}))]}))}))},n.prototype.stop=function(){this.isClosed||(this.isClosed=!0,this.analyser.disconnect(),this.audioContext.close(),null!=this.stream&&this.stream.getTracks().length>0&&this.stream.getTracks()[0].stop())},n.prototype.toArray=function(){throw new Error("Can not convert infinite audio stream to array.")},n.prototype.getSampleRate=function(){return this.sampleRateHz},n.prototype.flattenQueue=function(t){var e=t[0].length,n=new Float32Array(t.length*e);return t.forEach((function(t,r){return n.set(t,r*e)})),n},n.prototype.getTensorFromAudioDataArray=function(t,n){var r=new Float32Array(e.util.sizeFromShape(n));return r.set(t,r.length-t.length),e.tensor(r,n)},n}(j),ft=function(t){function n(n,r){var i=t.call(this)||this;if(i.webcamVideoElement=n,i.webcamConfig=r,i.isClosed=!0,i.resize=!1,i.needToResize())if(i.resize=!0,i.cropSize=[i.webcamConfig.resizeHeight,i.webcamConfig.resizeWidth],i.cropBoxInd=e.tensor1d([0],"int32"),i.webcamConfig.centerCrop){var o=1*i.webcamConfig.resizeWidth/i.webcamVideoElement.width,u=1*i.webcamConfig.resizeHeight/i.webcamVideoElement.height,s=(1-o)/2,a=(1-u)/2,c=s+o,l=u+a;i.cropBox=e.tensor2d([a,s,l,c],[1,4])}else i.cropBox=e.tensor2d([0,0,1,1],[1,4]);return i}return o(n,t),n.prototype.summary=function(){return"webcam"},n.create=function(t,r){return void 0===r&&(r={}),u(this,void 0,void 0,(function(){var i;return s(this,(function(o){switch(o.label){case 0:if(!e.env().get("IS_BROWSER"))throw new Error("tf.data.webcam is only supported in browser environment.");if(!t){if(t=document.createElement("video"),!r.resizeWidth||!r.resizeHeight)throw new Error("Please provide webcam video element, or resizeWidth and resizeHeight to create a hidden video element.");t.width=r.resizeWidth,t.height=r.resizeHeight}return[4,(i=new n(t,r)).start()];case 1:return o.sent(),[2,i]}}))}))},n.prototype.start=function(){return u(this,void 0,void 0,(function(){var t,n,r=this;return s(this,(function(i){switch(i.label){case 0:this.webcamConfig.facingMode&&e.util.assert("user"===this.webcamConfig.facingMode||"environment"===this.webcamConfig.facingMode,(function(){return"Invalid webcam facing mode: ".concat(r.webcamConfig.facingMode,". ")+"Please provide 'user' or 'environment'"})),i.label=1;case 1:return i.trys.push([1,3,,4]),t=this,[4,navigator.mediaDevices.getUserMedia({video:{deviceId:this.webcamConfig.deviceId,facingMode:this.webcamConfig.facingMode?this.webcamConfig.facingMode:"user",width:this.webcamVideoElement.width,height:this.webcamVideoElement.height}})];case 2:return t.stream=i.sent(),[3,4];case 3:throw(n=i.sent()).message="Error thrown while initializing video stream: ".concat(n.message),n;case 4:if(!this.stream)throw new Error("Could not obtain video from webcam.");try{this.webcamVideoElement.srcObject=this.stream}catch(t){console.log(t),this.webcamVideoElement.src=window.URL.createObjectURL(this.stream)}return this.webcamVideoElement.play(),this.isClosed=!1,[2,new Promise((function(t){r.webcamVideoElement.onloadedmetadata=function(){t()}}))]}}))}))},n.prototype.next=function(){return u(this,void 0,void 0,(function(){var t;return s(this,(function(n){if(this.isClosed)return[2,{value:null,done:!0}];try{t=e.browser.fromPixels(this.webcamVideoElement)}catch(t){throw new Error("Error thrown converting video to pixels: ".concat(JSON.stringify(t)))}if(!this.resize)return[2,{value:t,done:!1}];try{return[2,{value:this.cropAndResizeFrame(t),done:!1}]}catch(t){throw new Error("Error thrown cropping the video: ".concat(t.message))}finally{t.dispose()}return[2]}))}))},n.prototype.needToResize=function(){return!(!this.webcamConfig.resizeWidth||!this.webcamConfig.resizeHeight||this.webcamVideoElement.width===this.webcamConfig.resizeWidth&&this.webcamVideoElement.height===this.webcamConfig.resizeHeight)},n.prototype.cropAndResizeFrame=function(t){var n=this;return e.tidy((function(){var r,i=e.expandDims(e.cast(t,"float32"),0),o=(r=e.image.cropAndResize(i,n.cropBox,n.cropBoxInd,n.cropSize,"bilinear")).shape;return e.reshape(r,o.slice(1))}))},n.prototype.capture=function(){return u(this,void 0,void 0,(function(){return s(this,(function(t){switch(t.label){case 0:return[4,this.next()];case 1:return[2,t.sent().value]}}))}))},n.prototype.stop=function(){this.stream.getTracks().forEach((function(t){return t.stop()}));try{this.webcamVideoElement.srcObject=null}catch(t){console.log(t),this.webcamVideoElement.src=null}this.isClosed=!0},n.prototype.toArray=function(){throw new Error("Can not convert infinite video stream to array.")},n}(j),ht=function(){},dt=function(t){function e(){return null!==t&&t.apply(this,arguments)||this}return o(e,t),e.prototype.split=function(t){return new pt(this,t)},e}(j),pt=function(t){function e(e,n){var r=t.call(this)||this;return r.upstream=e,r.impl=new vt(e,n),r}return o(e,t),e.prototype.summary=function(){return this.impl.summary()},e.prototype.next=function(){return u(this,void 0,void 0,(function(){return s(this,(function(t){return[2,this.impl.next()]}))}))},e}(dt),vt=function(t){function e(e,n){var r=t.call(this)||this;return r.upstream=e,r.separator=n,r.carryover="",r}return o(e,t),e.prototype.summary=function(){return"".concat(this.upstream.summary()," -> Split('").concat(this.separator,"')")},e.prototype.pump=function(){return u(this,void 0,void 0,(function(){var t,e,n,r,i,o,u;return s(this,(function(s){switch(s.label){case 0:return[4,this.upstream.next()];case 1:if((t=s.sent()).done)return""===this.carryover?[2,!1]:(this.outputQueue.push(this.carryover),this.carryover="",[2,!0]);(e=t.value.split(this.separator))[0]=this.carryover+e[0];try{for(n=a(e.slice(0,-1)),r=n.next();!r.done;r=n.next())i=r.value,this.outputQueue.push(i)}catch(t){o={error:t}}finally{try{r&&!r.done&&(u=n.return)&&u.call(n)}finally{if(o)throw o.error}}return this.carryover=e[e.length-1],[2,!0]}}))}))},e}(X),mt=function(t){function e(){return null!==t&&t.apply(this,arguments)||this}return o(e,t),e.prototype.decodeUTF8=function(){return new yt(this)},e}(j),yt=function(t){function e(e){var n=t.call(this)||this;return n.upstream=e,n.impl=new wt(e),n}return o(e,t),e.prototype.summary=function(){return this.impl.summary()},e.prototype.next=function(){return u(this,void 0,void 0,(function(){return s(this,(function(t){return[2,this.impl.next()]}))}))},e}(dt),wt=function(t){function n(n){var r=t.call(this)||this;if(r.upstream=n,e.env().get("IS_BROWSER"))r.decoder=new TextDecoder("utf-8");else{var i=require("string_decoder").StringDecoder;r.decoder=new i("utf8")}return r}return o(n,t),n.prototype.summary=function(){return"".concat(this.upstream.summary()," -> Utf8")},n.prototype.pump=function(){return u(this,void 0,void 0,(function(){var t,n,r;return s(this,(function(i){switch(i.label){case 0:return[4,this.upstream.next()];case 1:return(t=i.sent()).done?[2,!1]:(n=t.value,r=e.env().get("IS_BROWSER")?this.decoder.decode(n,{stream:!0}):this.decoder.write(Buffer.from(n.buffer)),this.outputQueue.push(r),[2,!0])}}))}))},n}(X),bt=function(t){function n(n,r){void 0===r&&(r={});var i=t.call(this)||this;return i.file=n,i.options=r,e.util.assert(n instanceof Uint8Array||!!e.env().get("IS_BROWSER")&&(n instanceof File||n instanceof Blob),(function(){return"FileChunkIterator only supports File, Blob and Uint8Array right now."})),i.offset=r.offset||0,i.chunkSize=r.chunkSize||1048576,i}return o(n,t),n.prototype.summary=function(){return"FileChunks ".concat(this.file)},n.prototype.next=function(){return u(this,void 0,void 0,(function(){var t,e,n=this;return s(this,(function(r){switch(r.label){case 0:return this.offset>=(this.file instanceof Uint8Array?this.file.byteLength:this.file.size)?[2,{value:null,done:!0}]:(t=new Promise((function(t,e){var r=n.offset+n.chunkSize;if(n.file instanceof Uint8Array)t(new Uint8Array(n.file.slice(n.offset,r)));else{var i=new FileReader;i.onload=function(n){var r=i.result;if(r instanceof ArrayBuffer&&(r=new Uint8Array(r)),!(r instanceof Uint8Array))return e(new TypeError("FileReader returned unknown type."));t(r)},i.onabort=function(t){return e(new Error("Aborted"))},i.onerror=function(t){return e(new Error(t.type))};var o=n.file.slice(n.offset,r);i.readAsArrayBuffer(o)}n.offset=r})),e={},[4,t]);case 1:return[2,(e.value=r.sent(),e.done=!1,e)]}}))}))},n}(mt);function gt(t,n,r){return void 0===n&&(n={}),u(this,void 0,void 0,(function(){var i,o,u,a,c;return s(this,(function(s){switch(s.label){case 0:return"string"==typeof t?i=t:(i=t.url,o=xt(t)),[4,(r||e.util.fetch)(i,o)];case 1:return(u=s.sent()).ok?(c=Uint8Array.bind,[4,u.arrayBuffer()]):[3,3];case 2:return a=new(c.apply(Uint8Array,[void 0,s.sent()])),[2,new bt(a,n)];case 3:throw new Error(u.statusText)}}))}))}var xt=function(t){return{method:t.method,headers:t.headers,body:t.body,mode:t.mode,credentials:t.credentials,cache:t.cache,redirect:t.redirect,referrer:t.referrer,integrity:t.integrity}};function Ct(t){return"string"==typeof t&&"file://"===t.slice(0,7)}var zt=function(t){function n(e,n){void 0===n&&(n={});var r=t.call(this)||this;return r.input=e,r.options=n,r}return o(n,t),n.prototype.iterator=function(){return u(this,void 0,void 0,(function(){var t;return s(this,(function(n){return Ct(this.input)&&e.env().get("IS_NODE")&&(t=require("fs"),this.input=t.readFileSync(this.input.slice(7))),[2,new bt(this.input,this.options)]}))}))},n}(ht),Et=function(t){function e(e,n){void 0===n&&(n={});var r=t.call(this)||this;return r.url=e,r.fileOptions=n,r}return o(e,t),e.prototype.iterator=function(){return u(this,void 0,void 0,(function(){return s(this,(function(t){return Ct(this.url)?[2,new zt(this.url,this.fileOptions).iterator()]:[2,gt(this.url,this.fileOptions)]}))}))},e}(ht);t.CSVDataset=ct,t.Dataset=$,t.FileDataSource=zt,t.TextLineDataset=nt,t.URLDataSource=Et,t.array=function(t){var e=this;return tt((function(){return u(e,void 0,void 0,(function(){return s(this,(function(e){return[2,N(t)]}))}))}),t.length)},t.csv=function(t,e){return void 0===e&&(e={}),new ct(new Et(t),e)},t.func=function(t){var e=this,n=D(t);return tt((function(){return u(e,void 0,void 0,(function(){return s(this,(function(t){return[2,n]}))}))}))},t.generator=function(t){var e=this;return tt((function(){return u(e,void 0,void 0,(function(){var e;return s(this,(function(n){switch(n.label){case 0:return[4,t()];case 1:return e=n.sent(),[2,D((function(){return e.next()}))]}}))}))}))},t.microphone=function(t){return u(this,void 0,void 0,(function(){return s(this,(function(e){return[2,lt.create(t)]}))}))},t.version_data="4.3.0",t.webcam=function(t,e){return u(this,void 0,void 0,(function(){return s(this,(function(n){return[2,ft.create(t,e)]}))}))},t.zip=function(t){var e,n=this;if(!T(t))throw new Error("The argument to zip() must be an object or array.");if(Array.isArray(t))for(var r=0;r<t.length;r++)e=null==e?t[r].size:Math.min(e,t[r].size);else if(t instanceof Object)for(var i in t)e=null==e?t[i].size:Math.min(e,t[i].size);return tt((function(){return u(n,void 0,void 0,(function(){var e;return s(this,(function(n){switch(n.label){case 0:return[4,R(t,(function(t){if(t instanceof $)return{value:t.iterator(),recurse:!1};if(T(t))return{value:null,recurse:!0};throw new Error("Leaves of the structure passed to zip() must be Datasets, not primitives.")}))];case 1:return e=n.sent(),[2,(r=e,i=I.SHORTEST,void 0===i&&(i=I.FAIL),new J(r,i))]}var r,i}))}))}),e)},Object.defineProperty(t,"__esModule",{value:!0})}));
 //# sourceMappingURL=tf-data.min.js.map

dist/statistics.d.ts

@@ -27,7 +27,7 @@ /**
  */
-export declare type ElementArray = number | number[] | tf.Tensor | string;
+export type ElementArray = number | number[] | tf.Tensor | string;
 /**
  * A map from string keys (aka column names) to values for a single element.
  */
-export declare type TabularRecord = {
+export type TabularRecord = {
     [key: string]: ElementArray;
@@ -34,0 +34,0 @@ };

dist/tf-data.es2017.min.js

@@ -17,3 +17,3 @@ /**
  */
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k{constructor(t,e){super(),this.upstream=t,this.transform=e}summary(){return`${this.upstream.summary()} -> Map`}async next(){const t=await this.upstream.next();if(t.done)return{value:null,done:!0};const e=s.tensor_util.getTensorsInContainer(t.value),r=this.transform(t.value),n=s.tensor_util.getTensorsInContainer(r);for(const t of e)s.tensor_util.isTensorInList(t,n)||t.dispose();return{value:r,done:!1}}}class B extends k{constructor(t,e){super(),this.upstream=t,this.handler=e,this.count=0,this.lastRead=Promise.resolve({value:null,done:!1})}summary(){return`${this.upstream.summary()} -> handleErrors`}async next(){return this.lastRead=this.lastRead.then((()=>this.serialNext())),this.lastRead}async serialNext(){for(;;)try{return await this.upstream.next()}catch(t){if(!this.handler(t))return{value:null,done:!0}}}}class $ extends k{constructor(t,e){super(),this.upstream=t,this.transform=e}summary(){return`${this.upstream.summary()} -> AsyncMap`}async next(){const t=await this.upstream.next();if(t.done)return{value:null,done:!0};const e=s.tensor_util.getTensorsInContainer(t.value),r=await this.transform(t.value),n=s.tensor_util.getTensorsInContainer(r);for(const t of e)s.tensor_util.isTensorInList(t,n)||t.dispose();return{value:r,done:!1}}}class P extends k{constructor(){super(),this.outputQueue=new R,this.lastRead=Promise.resolve({value:null,done:!1})}async next(){return this.lastRead=this.lastRead.then((()=>this.serialNext())),this.lastRead}async serialNext(){for(;0===this.outputQueue.length();)if(!await this.pump())return{value:null,done:!0};return{value:this.outputQueue.shift(),done:!1}}}class L extends P{constructor(t,e){super(),this.upstream=t,this.transform=e}summary(){return`${this.upstream.summary()} -> Flatmap`}async pump(){const t=await this.upstream.next();if(t.done)return!1;const e=s.tensor_util.getTensorsInContainer(t.value),r=this.transform(t.value),n=s.tensor_util.getTensorsInContainer(r);this.outputQueue.pushAll(r);for(const t of e)s.tensor_util.isTensorInList(t,n)||t.dispose();return!0}}class q extends k{constructor(t,e){super(),this.baseErrorHandler=e,this.lastRead=null,this.iterator=null,this.moreIterators=t}summary(){return"TODO: fill in upstream of chained summaries -> Chained"}async next(){return this.lastRead=this.readFromChain(this.lastRead),this.lastRead}async readFromChain(t){if(await t,null==this.iterator){const t=await this.moreIterators.next();if(t.done)return{value:null,done:!0};this.iterator=t.value,null!=this.baseErrorHandler&&(this.iterator=this.iterator.handleErrors(this.baseErrorHandler))}const e=await this.iterator.next();return e.done?(this.iterator=null,this.readFromChain(t)):e}}!function(t){t[t.FAIL=0]="FAIL",t[t.SHORTEST=1]="SHORTEST",t[t.LONGEST=2]="LONGEST"}(p||(p={}));class H extends k{constructor(t,e=p.FAIL){super(),this.iterators=t,this.mismatchMode=e,this.count=0,this.currentPromise=null}summary(){return"{TODO: fill in upstream of zip summaries} -> Zip"}async nextState(t){await t;let e=0,r=0;const s=await b(this.iterators,(function(t){if(t instanceof k){return{value:t.next().then((t=>(e++,t.done&&r++,t.value))),recurse:!1}}return{value:null,recurse:!0}}));if(e===r)return{value:null,done:!0};if(r>0)switch(this.mismatchMode){case p.FAIL:throw new Error(`Zipped streams should have the same length. Mismatched at element ${this.count}.`);case p.SHORTEST:return{value:null,done:!0};case p.LONGEST:}return this.count++,{value:s,done:!1}}async next(){return this.currentPromise=this.nextState(this.currentPromise),this.currentPromise}}class W extends k{constructor(t,e){super(),this.upstream=t,this.bufferSize=e,this.buffer=new S(e)}summary(){return`${this.upstream.summary()} -> Prefetch`}refill(){for(;!this.buffer.isFull();){const t=this.upstream.next();this.buffer.push(t)}}next(){return this.refill(),this.buffer.shift()}}class V extends W{constructor(t,e,r){super(t,e),this.upstream=t,this.windowSize=e,this.upstreamExhausted=!1,this.random=w.alea(r||s.util.now().toString()),this.lastRead=Promise.resolve({value:null,done:!1})}async next(){return this.lastRead=this.lastRead.then((()=>this.serialNext())),this.lastRead}randomInt(t){return Math.floor(this.random()*t)}chooseIndex(){return this.randomInt(this.buffer.length())}async serialNext(){for(this.upstreamExhausted||this.refill();!this.buffer.isEmpty();){const t=this.chooseIndex(),e=await this.buffer.shuffleExcise(t);if(!e.done)return this.refill(),e;this.upstreamExhausted=!0}return{value:null,done:!0}}}class U{constructor(){this.size=null}batch(t,e=!0){const r=this;let n;return s.util.assert(t>0,(()=>`batchSize needs to be positive, but it is\n      ${t}`)),n=this.size===1/0||null==this.size?this.size:e?Math.ceil(this.size/t):Math.floor(this.size/t),Q((async()=>(await r.iterator()).columnMajorBatch(t,e,X)),n)}concatenate(t){const e=this;let r;return r=this.size===1/0||t.size===1/0?1/0:null!=this.size&&null!=t.size?this.size+t.size:null,Q((async()=>(await e.iterator()).concatenate(await t.iterator())),r)}filter(t){const e=this;let r;return r=this.size===1/0?1/0:null,Q((async()=>(await e.iterator()).filter((e=>s.tidy((()=>t(e)))))),r)}async forEachAsync(t){return(await this.iterator()).forEachAsync(t)}map(t){const e=this;return Q((async()=>(await e.iterator()).map((e=>s.tidy((()=>t(e)))))),this.size)}mapAsync(t){const e=this;return Q((async()=>(await e.iterator()).mapAsync(t)),this.size)}prefetch(t){if(null==t)throw new RangeError("`Dataset.prefetch()` requires bufferSize to be specified.");const e=this;return Q((async()=>(await e.iterator()).prefetch(t)),this.size)}repeat(t){const e=this;let r;return r=null!=this.size&&t>0?this.size*t:0===t?0:null!=this.size&&(void 0===t||t<0)?1/0:null,Q((async()=>{const r=T((async()=>({value:await e.iterator(),done:!1})));return s=r.take(t),new q(s,n);var s,n}),r)}skip(t){const e=this;let r;return r=null!=this.size&&t>=0&&this.size>=t?this.size-t:null!=this.size&&(this.size<t||void 0===t||t<0)?0:null,Q((async()=>(await e.iterator()).skip(t)),r)}shuffle(t,e,r=!0){if(null==t||t<0)throw null==this.size?new RangeError("`Dataset.shuffle()` requires bufferSize to be specified."):new RangeError(`\`Dataset.shuffle()\` requires bufferSize to be specified.  If your data fits in main memory (for regular JS objects), and/or GPU memory (for \`tf.Tensor\`s), consider setting bufferSize to the dataset size (${this.size} elements)`);const n=this,i=w.alea(e||s.util.now().toString());return Q((async()=>{let e=i.int32();return r&&(e+=i.int32()),(await n.iterator()).shuffle(t,e.toString())}),this.size)}take(t){const e=this;let r;return r=null!=this.size&&this.size>t?t:null!=this.size&&this.size<=t?this.size:null,Q((async()=>(await e.iterator()).take(t)),r)}async toArray(){if(this.size===1/0)throw new Error("Can not convert infinite data stream to array.");return(await this.iterator()).toArray()}async toArrayForTest(){if(this.size===1/0)throw new Error("Can not convert infinite data stream to array.");return(await this.iterator()).toArrayForTest()}}function Q(t,e=null){return new class extends U{constructor(){super(...arguments),this.size=e}async iterator(){return t()}}}function X(t){if(null===t)return null;const e=t[0];if(null==(r=e)||null===(n=r)||"object"!=typeof n&&"function"!=typeof n||Array.isArray(r)||"object"==typeof r&&r instanceof s.Tensor||s.util.isTypedArray(r)){return{value:function(t){if(0===t.length)throw new Error("Can't make a batch of zero elements.");return t[0]instanceof s.Tensor?s.stack(t):s.tensor(t)}(t),recurse:!1}}var r,n;return{value:null,recurse:!0}}U.MAX_BUFFER_SIZE=1e4;class G extends U{constructor(t){super(),this.input=t}async iterator(){return(await this.input.iterator()).decodeUTF8().split("\n").map((t=>(t.endsWith("\r")&&(t=t.slice(0,-1)),t)))}}const Z='"',J=Symbol("out"),Y=Symbol("field"),K=Symbol("quote"),tt=Symbol("quoteafterquote"),et=Symbol("quoteinquote");class rt extends U{constructor(t,r){super(),this.input=t,this.hasHeader=!0,this.fullColumnNames=null,this.columnNamesValidated=!1,this.columnConfigs=null,this.configuredColumnsOnly=!1,this.delimiter=",",this.delimWhitespace=!1,this.base=new G(t),r||(r={}),this.hasHeader=!1!==r.hasHeader,this.fullColumnNames=r.columnNames,this.columnConfigs=r.columnConfigs,this.configuredColumnsOnly=r.configuredColumnsOnly,r.delimWhitespace?(e.util.assert(null==r.delimiter,(()=>"Delimiter should not be provided when delimWhitespace is true.")),this.delimWhitespace=!0,this.delimiter=" "):this.delimiter=r.delimiter?r.delimiter:","}async columnNames(){return this.columnNamesValidated||await this.setColumnNames(),this.configuredColumnsOnly?Object.keys(this.columnConfigs):this.fullColumnNames}async setColumnNames(){const t=await this.maybeReadHeaderLine();if(!this.fullColumnNames&&!t)throw new Error("Column names must be provided if there is no header line.");this.fullColumnNames&&t&&e.util.assert(t.length===this.fullColumnNames.length,(()=>"The length of provided columnNames ("+this.fullColumnNames.length.toString()+") does not match the length of the header line read from file ("+t.length.toString()+").")),this.fullColumnNames||(this.fullColumnNames=t);const r=this.fullColumnNames.reduce(((t,e)=>(t[e]=t[e]+1||1,t)),{}),s=Object.keys(r).filter((t=>r[t]>1));if(e.util.assert(0===s.length,(()=>"Duplicate column names found: "+s.toString())),this.columnConfigs)for(const t of Object.keys(this.columnConfigs)){if(-1===this.fullColumnNames.indexOf(t))throw new Error('The key "'+t+'" provided in columnConfigs does not match any of the column names ('+this.fullColumnNames.toString()+").")}this.columnNamesValidated=!0}async maybeReadHeaderLine(){if(this.hasHeader){const t=await this.base.iterator(),e=await t.next();if(e.done)throw new Error("No data was found for CSV parsing.");const r=e.value;return this.parseRow(r,!1)}return null}async iterator(){this.columnNamesValidated||await this.setColumnNames();let t=await this.base.iterator();return this.hasHeader&&(t=t.skip(1)),t.map((t=>this.makeDataElement(t)))}makeDataElement(t){const e=this.parseRow(t),r={},s={};for(let n=0;n<this.fullColumnNames.length;n++){const i=this.fullColumnNames[n],a=this.columnConfigs?this.columnConfigs[i]:null;if(!this.configuredColumnsOnly||a){const o=e[n];let u=null;if(""===o)if(a&&void 0!==a.default)u=a.default;else{if(a&&(a.required||a.isLabel))throw new Error(`Required column ${i} is empty in this line: ${t}`);u=void 0}else{const t=Number(o);if(isNaN(t))u=a&&"bool"===a.dtype?this.getBoolean(o):o;else if(a&&a.dtype)switch(a.dtype){case"float32":default:u=t;break;case"int32":u=Math.floor(t);break;case"bool":u=this.getBoolean(o)}else u=t}a&&a.isLabel?s[i]=u:r[i]=u}}return 0===Object.keys(s).length?r:{xs:r,ys:s}}getBoolean(t){return"1"===t||"true"===t.toLowerCase()?1:0}parseRow(t,e=!0){const r=[];let s=0;const n=t.length;let i=J;for(let e=0;e<n;e++)switch(i){case J:switch(t.charAt(e)){case Z:s=e+1,i=K;break;case this.delimiter:if(s=e+1," "===this.delimiter&&this.delimWhitespace)break;r.push(""),i=J;break;default:i=Y,s=e}break;case Y:if(t.charAt(e)===this.delimiter)r.push(t.substring(s,e)),i=J,s=e+1;break;case K:if(t.charAt(e)===Z)i=tt;break;case tt:switch(t.charAt(e)){case this.delimiter:r.push(t.substring(s,e-1)),i=J,s=e+1;break;case Z:i=K;break;default:i=et}break;case et:if(t.charAt(e)===Z)i=K}if(i===tt?r.push(t.substring(s,n-1)):r.push(t.substring(s)),e&&r.length!==this.fullColumnNames.length)throw new Error(`Invalid row in csv file. Should have ${this.fullColumnNames.length} elements in a row, but got ${r}`);return r}}class st extends k{constructor(t){super(),this.microphoneConfig=t,this.isClosed=!1,this.fftSize=t.fftSize||1024;const e=Math.log2(this.fftSize);if(this.fftSize<0||e<4||e>14||!Number.isInteger(e))throw new Error(`Invalid fftSize: it must be a power of 2 between 2 to 4 and 2 to 14, but got ${this.fftSize}`);if(this.numFrames=t.numFramesPerSpectrogram||43,this.sampleRateHz=t.sampleRateHz,this.columnTruncateLength=t.columnTruncateLength||this.fftSize,this.audioTrackConstraints=t.audioTrackConstraints,this.smoothingTimeConstant=t.smoothingTimeConstant||0,this.includeSpectrogram=!1!==t.includeSpectrogram,this.includeWaveform=!0===t.includeWaveform,!this.includeSpectrogram&&!this.includeWaveform)throw new Error("Both includeSpectrogram and includeWaveform are false. At least one type of data should be returned.")}summary(){return"microphone"}static async create(t={}){if(!e.env().get("IS_BROWSER"))throw new Error("microphone API is only supported in browser environment.");const r=new st(t);return await r.start(),r}async start(){try{this.stream=await navigator.mediaDevices.getUserMedia({audio:null==this.audioTrackConstraints||this.audioTrackConstraints,video:!1})}catch(t){throw new Error(`Error thrown while initializing video stream: ${t.message}`)}if(!this.stream)throw new Error("Could not obtain audio from microphone.");const t=window.AudioContext||window.webkitAudioContext;if(this.audioContext=new t,this.sampleRateHz){if(this.audioContext.sampleRate!==this.sampleRateHz)throw new Error(`Mismatch in sampling rate: Expected: ${this.sampleRateHz}; Actual: ${this.audioContext.sampleRate}`)}else this.sampleRateHz=this.audioContext.sampleRate;const e=this.audioContext.createMediaStreamSource(this.stream);this.analyser=this.audioContext.createAnalyser(),this.analyser.fftSize=2*this.fftSize,this.analyser.smoothingTimeConstant=this.smoothingTimeConstant,e.connect(this.analyser),this.freqData=new Float32Array(this.fftSize),this.timeData=new Float32Array(this.fftSize)}async next(){if(this.isClosed)return{value:null,done:!0};let t,e;const r=await this.getAudioData();if(this.includeSpectrogram){const e=this.flattenQueue(r.freqDataQueue);t=this.getTensorFromAudioDataArray(e,[this.numFrames,this.columnTruncateLength,1])}if(this.includeWaveform){const t=this.flattenQueue(r.timeDataQueue);e=this.getTensorFromAudioDataArray(t,[this.numFrames*this.fftSize,1])}return{value:{spectrogram:t,waveform:e},done:!1}}async capture(){return(await this.next()).value}async getAudioData(){const t=[],e=[];let r=0;return new Promise((s=>{const n=setInterval((()=>{this.includeSpectrogram&&(this.analyser.getFloatFrequencyData(this.freqData),this.freqData[0]===-1/0&&s({freqDataQueue:t,timeDataQueue:e}),t.push(this.freqData.slice(0,this.columnTruncateLength))),this.includeWaveform&&(this.analyser.getFloatTimeDomainData(this.timeData),e.push(this.timeData.slice())),++r===this.numFrames&&(clearInterval(n),s({freqDataQueue:t,timeDataQueue:e}))}),this.fftSize/this.sampleRateHz*1e3)}))}stop(){this.isClosed||(this.isClosed=!0,this.analyser.disconnect(),this.audioContext.close(),null!=this.stream&&this.stream.getTracks().length>0&&this.stream.getTracks()[0].stop())}toArray(){throw new Error("Can not convert infinite audio stream to array.")}getSampleRate(){return this.sampleRateHz}flattenQueue(t){const e=t[0].length,r=new Float32Array(t.length*e);return t.forEach(((t,s)=>r.set(t,s*e))),r}getTensorFromAudioDataArray(t,r){const s=new Float32Array(e.util.sizeFromShape(r));return s.set(t,s.length-t.length),e.tensor(s,r)}}class nt extends k{constructor(t,r){if(super(),this.webcamVideoElement=t,this.webcamConfig=r,this.isClosed=!0,this.resize=!1,this.needToResize())if(this.resize=!0,this.cropSize=[this.webcamConfig.resizeHeight,this.webcamConfig.resizeWidth],this.cropBoxInd=e.tensor1d([0],"int32"),this.webcamConfig.centerCrop){const t=1*this.webcamConfig.resizeWidth/this.webcamVideoElement.width,r=1*this.webcamConfig.resizeHeight/this.webcamVideoElement.height,s=(1-t)/2,n=(1-r)/2,i=s+t,a=r+n;this.cropBox=e.tensor2d([n,s,a,i],[1,4])}else this.cropBox=e.tensor2d([0,0,1,1],[1,4])}summary(){return"webcam"}static async create(t,r={}){if(!e.env().get("IS_BROWSER"))throw new Error("tf.data.webcam is only supported in browser environment.");if(!t){if(t=document.createElement("video"),!r.resizeWidth||!r.resizeHeight)throw new Error("Please provide webcam video element, or resizeWidth and resizeHeight to create a hidden video element.");t.width=r.resizeWidth,t.height=r.resizeHeight}const s=new nt(t,r);return await s.start(),s}async start(){this.webcamConfig.facingMode&&e.util.assert("user"===this.webcamConfig.facingMode||"environment"===this.webcamConfig.facingMode,(()=>`Invalid webcam facing mode: ${this.webcamConfig.facingMode}. Please provide 'user' or 'environment'`));try{this.stream=await navigator.mediaDevices.getUserMedia({video:{deviceId:this.webcamConfig.deviceId,facingMode:this.webcamConfig.facingMode?this.webcamConfig.facingMode:"user",width:this.webcamVideoElement.width,height:this.webcamVideoElement.height}})}catch(t){throw t.message=`Error thrown while initializing video stream: ${t.message}`,t}if(!this.stream)throw new Error("Could not obtain video from webcam.");try{this.webcamVideoElement.srcObject=this.stream}catch(t){console.log(t),this.webcamVideoElement.src=window.URL.createObjectURL(this.stream)}return this.webcamVideoElement.play(),this.isClosed=!1,new Promise((t=>{this.webcamVideoElement.onloadedmetadata=()=>{t()}}))}async next(){if(this.isClosed)return{value:null,done:!0};let t;try{t=e.browser.fromPixels(this.webcamVideoElement)}catch(t){throw new Error(`Error thrown converting video to pixels: ${JSON.stringify(t)}`)}if(!this.resize)return{value:t,done:!1};try{return{value:this.cropAndResizeFrame(t),done:!1}}catch(t){throw new Error(`Error thrown cropping the video: ${t.message}`)}finally{t.dispose()}}needToResize(){return!(!this.webcamConfig.resizeWidth||!this.webcamConfig.resizeHeight||this.webcamVideoElement.width===this.webcamConfig.resizeWidth&&this.webcamVideoElement.height===this.webcamConfig.resizeHeight)}cropAndResizeFrame(t){return e.tidy((()=>{const r=e.expandDims(e.cast(t,"float32"),0);let s;s=e.image.cropAndResize(r,this.cropBox,this.cropBoxInd,this.cropSize,"bilinear");const n=s.shape;return e.reshape(s,n.slice(1))}))}async capture(){return(await this.next()).value}stop(){this.stream.getTracks().forEach((t=>t.stop()));try{this.webcamVideoElement.srcObject=null}catch(t){console.log(t),this.webcamVideoElement.src=null}this.isClosed=!0}toArray(){throw new Error("Can not convert infinite video stream to array.")}}class it{}class at extends k{split(t){return new ot(this,t)}}class ot extends at{constructor(t,e){super(),this.upstream=t,this.impl=new ut(t,e)}summary(){return this.impl.summary()}async next(){return this.impl.next()}}class ut extends P{constructor(t,e){super(),this.upstream=t,this.separator=e,this.carryover=""}summary(){return`${this.upstream.summary()} -> Split('${this.separator}')`}async pump(){const t=await this.upstream.next();if(t.done)return""!==this.carryover&&(this.outputQueue.push(this.carryover),this.carryover="",!0);const e=t.value.split(this.separator);e[0]=this.carryover+e[0];for(const t of e.slice(0,-1))this.outputQueue.push(t);return this.carryover=e[e.length-1],!0}}class ht extends k{decodeUTF8(){return new lt(this)}}class lt extends at{constructor(t){super(),this.upstream=t,this.impl=new ct(t)}summary(){return this.impl.summary()}async next(){return this.impl.next()}}class ct extends P{constructor(t){if(super(),this.upstream=t,e.env().get("IS_BROWSER"))this.decoder=new TextDecoder("utf-8");else{const{StringDecoder:t}=require("string_decoder");this.decoder=new t("utf8")}}summary(){return`${this.upstream.summary()} -> Utf8`}async pump(){const t=await this.upstream.next();let r,s;return!t.done&&(r=t.value,s=e.env().get("IS_BROWSER")?this.decoder.decode(r,{stream:!0}):this.decoder.write(Buffer.from(r.buffer)),this.outputQueue.push(s),!0)}}class ft extends ht{constructor(t,r={}){super(),this.file=t,this.options=r,e.util.assert(t instanceof Uint8Array||!!e.env().get("IS_BROWSER")&&(t instanceof File||t instanceof Blob),(()=>"FileChunkIterator only supports File, Blob and Uint8Array right now.")),this.offset=r.offset||0,this.chunkSize=r.chunkSize||1048576}summary(){return`FileChunks ${this.file}`}async next(){if(this.offset>=(this.file instanceof Uint8Array?this.file.byteLength:this.file.size))return{value:null,done:!0};const t=new Promise(((t,e)=>{const r=this.offset+this.chunkSize;if(this.file instanceof Uint8Array)t(new Uint8Array(this.file.slice(this.offset,r)));else{const s=new FileReader;s.onload=r=>{let n=s.result;if(n instanceof ArrayBuffer&&(n=new Uint8Array(n)),!(n instanceof Uint8Array))return e(new TypeError("FileReader returned unknown type."));t(n)},s.onabort=t=>e(new Error("Aborted")),s.onerror=t=>e(new Error(t.type));const n=this.file.slice(this.offset,r);s.readAsArrayBuffer(n)}this.offset=r}));return{value:await t,done:!1}}}const dt=t=>({method:t.method,headers:t.headers,body:t.body,mode:t.mode,credentials:t.credentials,cache:t.cache,redirect:t.redirect,referrer:t.referrer,integrity:t.integrity});function mt(t){return"string"==typeof t&&"file://"===t.slice(0,7)}class pt extends it{constructor(t,e={}){super(),this.input=t,this.options=e}async iterator(){if(mt(this.input)&&e.env().get("IS_NODE")){const t=require("fs");this.input=t.readFileSync(this.input.slice(7))}return new ft(this.input,this.options)}}class wt extends it{constructor(t,e={}){super(),this.url=t,this.fileOptions=e}async iterator(){return mt(this.url)?new pt(this.url,this.fileOptions).iterator():async function(t,r={},s){let n,i;"string"==typeof t?n=t:(n=t.url,i=dt(t));const a=await(s||e.util.fetch)(n,i);if(a.ok){const t=new Uint8Array(await a.arrayBuffer());return new ft(t,r)}throw new Error(a.statusText)}(this.url,this.fileOptions)}}t.CSVDataset=rt,t.Dataset=U,t.FileDataSource=pt,t.TextLineDataset=G,t.URLDataSource=wt,t.array=function(t){return Q((async()=>A(t)),t.length)},t.csv=function(t,e={}){return new rt(new wt(t),e)},t.func=function(t){const e=T(t);return Q((async()=>e))},t.generator=function(t){return Q((async()=>{const e=await t();return T((()=>e.next()))}))},t.microphone=async function(t){return st.create(t)},t.version_data="4.2.0",t.webcam=async function(t,e){return nt.create(t,e)},t.zip=function(t){if(!C(t))throw new Error("The argument to zip() must be an object or array.");let e;if(Array.isArray(t))for(let r=0;r<t.length;r++)e=null==e?t[r].size:Math.min(e,t[r].size);else if(t instanceof Object)for(const r in t)e=null==e?t[r].size:Math.min(e,t[r].size);return Q((async()=>function(t,e=p.FAIL){return new H(t,e)}(await b(t,(t=>{if(t instanceof U)return{value:t.iterator(),recurse:!1};if(C(t))return{value:null,recurse:!0};throw new Error("Leaves of the structure passed to zip() must be Datasets, not primitives.")})),p.SHORTEST)),e)},Object.defineProperty(t,"__esModule",{value:!0})}));
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k{constructor(t,e,r=!0){super(),this.upstream=t,this.batchSize=e,this.enableSmallLastBatch=r,this.lastRead=Promise.resolve({value:null,done:!1})}summary(){return`${this.upstream.summary()} -> RowMajorBatch`}async next(){return this.lastRead=this.lastRead.then((()=>this.serialNext())),this.lastRead}async serialNext(){const t=[];for(;t.length<this.batchSize;){const e=await this.upstream.next();if(e.done)return this.enableSmallLastBatch&&t.length>0?{value:t,done:!1}:{value:null,done:!0};t.push(e.value)}return{value:t,done:!1}}}class j extends k{constructor(t,e){super(),this.upstream=t,this.predicate=e,this.lastRead=Promise.resolve({value:null,done:!1})}summary(){return`${this.upstream.summary()} -> Filter`}async next(){return this.lastRead=this.lastRead.then((()=>this.serialNext())),this.lastRead}async serialNext(){for(;;){const t=await this.upstream.next();if(t.done||this.predicate(t.value))return t;s.dispose(t.value)}}}class M extends k{constructor(t,e){super(),this.upstream=t,this.transform=e}summary(){return`${this.upstream.summary()} -> Map`}async next(){const t=await this.upstream.next();if(t.done)return{value:null,done:!0};const e=s.tensor_util.getTensorsInContainer(t.value),r=this.transform(t.value),n=s.tensor_util.getTensorsInContainer(r);for(const t of e)s.tensor_util.isTensorInList(t,n)||t.dispose();return{value:r,done:!1}}}class B extends k{constructor(t,e){super(),this.upstream=t,this.handler=e,this.count=0,this.lastRead=Promise.resolve({value:null,done:!1})}summary(){return`${this.upstream.summary()} -> handleErrors`}async next(){return this.lastRead=this.lastRead.then((()=>this.serialNext())),this.lastRead}async serialNext(){for(;;)try{return await this.upstream.next()}catch(t){if(!this.handler(t))return{value:null,done:!0}}}}class $ extends k{constructor(t,e){super(),this.upstream=t,this.transform=e}summary(){return`${this.upstream.summary()} -> AsyncMap`}async next(){const t=await this.upstream.next();if(t.done)return{value:null,done:!0};const e=s.tensor_util.getTensorsInContainer(t.value),r=await this.transform(t.value),n=s.tensor_util.getTensorsInContainer(r);for(const t of e)s.tensor_util.isTensorInList(t,n)||t.dispose();return{value:r,done:!1}}}class P extends k{constructor(){super(),this.outputQueue=new R,this.lastRead=Promise.resolve({value:null,done:!1})}async next(){return this.lastRead=this.lastRead.then((()=>this.serialNext())),this.lastRead}async serialNext(){for(;0===this.outputQueue.length();)if(!await this.pump())return{value:null,done:!0};return{value:this.outputQueue.shift(),done:!1}}}class L extends P{constructor(t,e){super(),this.upstream=t,this.transform=e}summary(){return`${this.upstream.summary()} -> Flatmap`}async pump(){const t=await this.upstream.next();if(t.done)return!1;const e=s.tensor_util.getTensorsInContainer(t.value),r=this.transform(t.value),n=s.tensor_util.getTensorsInContainer(r);this.outputQueue.pushAll(r);for(const t of e)s.tensor_util.isTensorInList(t,n)||t.dispose();return!0}}class q extends k{constructor(t,e){super(),this.baseErrorHandler=e,this.lastRead=null,this.iterator=null,this.moreIterators=t}summary(){return"TODO: fill in upstream of chained summaries -> Chained"}async next(){return this.lastRead=this.readFromChain(this.lastRead),this.lastRead}async readFromChain(t){if(await t,null==this.iterator){const t=await this.moreIterators.next();if(t.done)return{value:null,done:!0};this.iterator=t.value,null!=this.baseErrorHandler&&(this.iterator=this.iterator.handleErrors(this.baseErrorHandler))}const e=await this.iterator.next();return e.done?(this.iterator=null,this.readFromChain(t)):e}}!function(t){t[t.FAIL=0]="FAIL",t[t.SHORTEST=1]="SHORTEST",t[t.LONGEST=2]="LONGEST"}(p||(p={}));class H extends k{constructor(t,e=p.FAIL){super(),this.iterators=t,this.mismatchMode=e,this.count=0,this.currentPromise=null}summary(){return"{TODO: fill in upstream of zip summaries} -> Zip"}async nextState(t){await t;let e=0,r=0;const s=await b(this.iterators,(function(t){if(t instanceof k){return{value:t.next().then((t=>(e++,t.done&&r++,t.value))),recurse:!1}}return{value:null,recurse:!0}}));if(e===r)return{value:null,done:!0};if(r>0)switch(this.mismatchMode){case p.FAIL:throw new Error(`Zipped streams should have the same length. Mismatched at element ${this.count}.`);case p.SHORTEST:return{value:null,done:!0};case p.LONGEST:}return this.count++,{value:s,done:!1}}async next(){return this.currentPromise=this.nextState(this.currentPromise),this.currentPromise}}class W extends k{constructor(t,e){super(),this.upstream=t,this.bufferSize=e,this.buffer=new S(e)}summary(){return`${this.upstream.summary()} -> Prefetch`}refill(){for(;!this.buffer.isFull();){const t=this.upstream.next();this.buffer.push(t)}}next(){return this.refill(),this.buffer.shift()}}class V extends W{constructor(t,e,r){super(t,e),this.upstream=t,this.windowSize=e,this.upstreamExhausted=!1,this.random=w.alea(r||s.util.now().toString()),this.lastRead=Promise.resolve({value:null,done:!1})}async next(){return this.lastRead=this.lastRead.then((()=>this.serialNext())),this.lastRead}randomInt(t){return Math.floor(this.random()*t)}chooseIndex(){return this.randomInt(this.buffer.length())}async serialNext(){for(this.upstreamExhausted||this.refill();!this.buffer.isEmpty();){const t=this.chooseIndex(),e=await this.buffer.shuffleExcise(t);if(!e.done)return this.refill(),e;this.upstreamExhausted=!0}return{value:null,done:!0}}}class U{constructor(){this.size=null}batch(t,e=!0){const r=this;let n;return s.util.assert(t>0,(()=>`batchSize needs to be positive, but it is\n      ${t}`)),n=this.size===1/0||null==this.size?this.size:e?Math.ceil(this.size/t):Math.floor(this.size/t),Q((async()=>(await r.iterator()).columnMajorBatch(t,e,X)),n)}concatenate(t){const e=this;let r;return r=this.size===1/0||t.size===1/0?1/0:null!=this.size&&null!=t.size?this.size+t.size:null,Q((async()=>(await e.iterator()).concatenate(await t.iterator())),r)}filter(t){const e=this;let r;return r=this.size===1/0?1/0:null,Q((async()=>(await e.iterator()).filter((e=>s.tidy((()=>t(e)))))),r)}async forEachAsync(t){return(await this.iterator()).forEachAsync(t)}map(t){const e=this;return Q((async()=>(await e.iterator()).map((e=>s.tidy((()=>t(e)))))),this.size)}mapAsync(t){const e=this;return Q((async()=>(await e.iterator()).mapAsync(t)),this.size)}prefetch(t){if(null==t)throw new RangeError("`Dataset.prefetch()` requires bufferSize to be specified.");const e=this;return Q((async()=>(await e.iterator()).prefetch(t)),this.size)}repeat(t){const e=this;let r;return r=null!=this.size&&t>0?this.size*t:0===t?0:null!=this.size&&(void 0===t||t<0)?1/0:null,Q((async()=>{const r=T((async()=>({value:await e.iterator(),done:!1})));return s=r.take(t),new q(s,n);var s,n}),r)}skip(t){const e=this;let r;return r=null!=this.size&&t>=0&&this.size>=t?this.size-t:null!=this.size&&(this.size<t||void 0===t||t<0)?0:null,Q((async()=>(await e.iterator()).skip(t)),r)}shuffle(t,e,r=!0){if(null==t||t<0)throw null==this.size?new RangeError("`Dataset.shuffle()` requires bufferSize to be specified."):new RangeError(`\`Dataset.shuffle()\` requires bufferSize to be specified.  If your data fits in main memory (for regular JS objects), and/or GPU memory (for \`tf.Tensor\`s), consider setting bufferSize to the dataset size (${this.size} elements)`);const n=this,i=w.alea(e||s.util.now().toString());return Q((async()=>{let e=i.int32();return r&&(e+=i.int32()),(await n.iterator()).shuffle(t,e.toString())}),this.size)}take(t){const e=this;let r;return r=null!=this.size&&this.size>t?t:null!=this.size&&this.size<=t?this.size:null,Q((async()=>(await e.iterator()).take(t)),r)}async toArray(){if(this.size===1/0)throw new Error("Can not convert infinite data stream to array.");return(await this.iterator()).toArray()}async toArrayForTest(){if(this.size===1/0)throw new Error("Can not convert infinite data stream to array.");return(await this.iterator()).toArrayForTest()}}function Q(t,e=null){return new class extends U{constructor(){super(...arguments),this.size=e}async iterator(){return t()}}}function X(t){if(null===t)return null;const e=t[0];if(null==(r=e)||null===(n=r)||"object"!=typeof n&&"function"!=typeof n||Array.isArray(r)||"object"==typeof r&&r instanceof s.Tensor||s.util.isTypedArray(r)){return{value:function(t){if(0===t.length)throw new Error("Can't make a batch of zero elements.");return t[0]instanceof s.Tensor?s.stack(t):s.tensor(t)}(t),recurse:!1}}var r,n;return{value:null,recurse:!0}}U.MAX_BUFFER_SIZE=1e4;class G extends U{constructor(t){super(),this.input=t}async iterator(){return(await this.input.iterator()).decodeUTF8().split("\n").map((t=>(t.endsWith("\r")&&(t=t.slice(0,-1)),t)))}}const Z='"',J=Symbol("out"),Y=Symbol("field"),K=Symbol("quote"),tt=Symbol("quoteafterquote"),et=Symbol("quoteinquote");class rt extends U{async columnNames(){return this.columnNamesValidated||await this.setColumnNames(),this.configuredColumnsOnly?Object.keys(this.columnConfigs):this.fullColumnNames}async setColumnNames(){const t=await this.maybeReadHeaderLine();if(!this.fullColumnNames&&!t)throw new Error("Column names must be provided if there is no header line.");this.fullColumnNames&&t&&e.util.assert(t.length===this.fullColumnNames.length,(()=>"The length of provided columnNames ("+this.fullColumnNames.length.toString()+") does not match the length of the header line read from file ("+t.length.toString()+").")),this.fullColumnNames||(this.fullColumnNames=t);const r=this.fullColumnNames.reduce(((t,e)=>(t[e]=t[e]+1||1,t)),{}),s=Object.keys(r).filter((t=>r[t]>1));if(e.util.assert(0===s.length,(()=>"Duplicate column names found: "+s.toString())),this.columnConfigs)for(const t of Object.keys(this.columnConfigs)){if(-1===this.fullColumnNames.indexOf(t))throw new Error('The key "'+t+'" provided in columnConfigs does not match any of the column names ('+this.fullColumnNames.toString()+").")}this.columnNamesValidated=!0}async maybeReadHeaderLine(){if(this.hasHeader){const t=await this.base.iterator(),e=await t.next();if(e.done)throw new Error("No data was found for CSV parsing.");const r=e.value;return this.parseRow(r,!1)}return null}constructor(t,r){super(),this.input=t,this.hasHeader=!0,this.fullColumnNames=null,this.columnNamesValidated=!1,this.columnConfigs=null,this.configuredColumnsOnly=!1,this.delimiter=",",this.delimWhitespace=!1,this.base=new G(t),r||(r={}),this.hasHeader=!1!==r.hasHeader,this.fullColumnNames=r.columnNames,this.columnConfigs=r.columnConfigs,this.configuredColumnsOnly=r.configuredColumnsOnly,r.delimWhitespace?(e.util.assert(null==r.delimiter,(()=>"Delimiter should not be provided when delimWhitespace is true.")),this.delimWhitespace=!0,this.delimiter=" "):this.delimiter=r.delimiter?r.delimiter:","}async iterator(){this.columnNamesValidated||await this.setColumnNames();let t=await this.base.iterator();return this.hasHeader&&(t=t.skip(1)),t.map((t=>this.makeDataElement(t)))}makeDataElement(t){const e=this.parseRow(t),r={},s={};for(let n=0;n<this.fullColumnNames.length;n++){const i=this.fullColumnNames[n],a=this.columnConfigs?this.columnConfigs[i]:null;if(!this.configuredColumnsOnly||a){const o=e[n];let u=null;if(""===o)if(a&&void 0!==a.default)u=a.default;else{if(a&&(a.required||a.isLabel))throw new Error(`Required column ${i} is empty in this line: ${t}`);u=void 0}else{const t=Number(o);if(isNaN(t))u=a&&"bool"===a.dtype?this.getBoolean(o):o;else if(a&&a.dtype)switch(a.dtype){case"float32":default:u=t;break;case"int32":u=Math.floor(t);break;case"bool":u=this.getBoolean(o)}else u=t}a&&a.isLabel?s[i]=u:r[i]=u}}return 0===Object.keys(s).length?r:{xs:r,ys:s}}getBoolean(t){return"1"===t||"true"===t.toLowerCase()?1:0}parseRow(t,e=!0){const r=[];let s=0;const n=t.length;let i=J;for(let e=0;e<n;e++)switch(i){case J:switch(t.charAt(e)){case Z:s=e+1,i=K;break;case this.delimiter:if(s=e+1," "===this.delimiter&&this.delimWhitespace)break;r.push(""),i=J;break;default:i=Y,s=e}break;case Y:if(t.charAt(e)===this.delimiter)r.push(t.substring(s,e)),i=J,s=e+1;break;case K:if(t.charAt(e)===Z)i=tt;break;case tt:switch(t.charAt(e)){case this.delimiter:r.push(t.substring(s,e-1)),i=J,s=e+1;break;case Z:i=K;break;default:i=et}break;case et:if(t.charAt(e)===Z)i=K}if(i===tt?r.push(t.substring(s,n-1)):r.push(t.substring(s)),e&&r.length!==this.fullColumnNames.length)throw new Error(`Invalid row in csv file. Should have ${this.fullColumnNames.length} elements in a row, but got ${r}`);return r}}class st extends k{constructor(t){super(),this.microphoneConfig=t,this.isClosed=!1,this.fftSize=t.fftSize||1024;const e=Math.log2(this.fftSize);if(this.fftSize<0||e<4||e>14||!Number.isInteger(e))throw new Error(`Invalid fftSize: it must be a power of 2 between 2 to 4 and 2 to 14, but got ${this.fftSize}`);if(this.numFrames=t.numFramesPerSpectrogram||43,this.sampleRateHz=t.sampleRateHz,this.columnTruncateLength=t.columnTruncateLength||this.fftSize,this.audioTrackConstraints=t.audioTrackConstraints,this.smoothingTimeConstant=t.smoothingTimeConstant||0,this.includeSpectrogram=!1!==t.includeSpectrogram,this.includeWaveform=!0===t.includeWaveform,!this.includeSpectrogram&&!this.includeWaveform)throw new Error("Both includeSpectrogram and includeWaveform are false. At least one type of data should be returned.")}summary(){return"microphone"}static async create(t={}){if(!e.env().get("IS_BROWSER"))throw new Error("microphone API is only supported in browser environment.");const r=new st(t);return await r.start(),r}async start(){try{this.stream=await navigator.mediaDevices.getUserMedia({audio:null==this.audioTrackConstraints||this.audioTrackConstraints,video:!1})}catch(t){throw new Error(`Error thrown while initializing video stream: ${t.message}`)}if(!this.stream)throw new Error("Could not obtain audio from microphone.");const t=window.AudioContext||window.webkitAudioContext;if(this.audioContext=new t,this.sampleRateHz){if(this.audioContext.sampleRate!==this.sampleRateHz)throw new Error(`Mismatch in sampling rate: Expected: ${this.sampleRateHz}; Actual: ${this.audioContext.sampleRate}`)}else this.sampleRateHz=this.audioContext.sampleRate;const e=this.audioContext.createMediaStreamSource(this.stream);this.analyser=this.audioContext.createAnalyser(),this.analyser.fftSize=2*this.fftSize,this.analyser.smoothingTimeConstant=this.smoothingTimeConstant,e.connect(this.analyser),this.freqData=new Float32Array(this.fftSize),this.timeData=new Float32Array(this.fftSize)}async next(){if(this.isClosed)return{value:null,done:!0};let t,e;const r=await this.getAudioData();if(this.includeSpectrogram){const e=this.flattenQueue(r.freqDataQueue);t=this.getTensorFromAudioDataArray(e,[this.numFrames,this.columnTruncateLength,1])}if(this.includeWaveform){const t=this.flattenQueue(r.timeDataQueue);e=this.getTensorFromAudioDataArray(t,[this.numFrames*this.fftSize,1])}return{value:{spectrogram:t,waveform:e},done:!1}}async capture(){return(await this.next()).value}async getAudioData(){const t=[],e=[];let r=0;return new Promise((s=>{const n=setInterval((()=>{this.includeSpectrogram&&(this.analyser.getFloatFrequencyData(this.freqData),this.freqData[0]===-1/0&&s({freqDataQueue:t,timeDataQueue:e}),t.push(this.freqData.slice(0,this.columnTruncateLength))),this.includeWaveform&&(this.analyser.getFloatTimeDomainData(this.timeData),e.push(this.timeData.slice())),++r===this.numFrames&&(clearInterval(n),s({freqDataQueue:t,timeDataQueue:e}))}),this.fftSize/this.sampleRateHz*1e3)}))}stop(){this.isClosed||(this.isClosed=!0,this.analyser.disconnect(),this.audioContext.close(),null!=this.stream&&this.stream.getTracks().length>0&&this.stream.getTracks()[0].stop())}toArray(){throw new Error("Can not convert infinite audio stream to array.")}getSampleRate(){return this.sampleRateHz}flattenQueue(t){const e=t[0].length,r=new Float32Array(t.length*e);return t.forEach(((t,s)=>r.set(t,s*e))),r}getTensorFromAudioDataArray(t,r){const s=new Float32Array(e.util.sizeFromShape(r));return s.set(t,s.length-t.length),e.tensor(s,r)}}class nt extends k{constructor(t,r){if(super(),this.webcamVideoElement=t,this.webcamConfig=r,this.isClosed=!0,this.resize=!1,this.needToResize())if(this.resize=!0,this.cropSize=[this.webcamConfig.resizeHeight,this.webcamConfig.resizeWidth],this.cropBoxInd=e.tensor1d([0],"int32"),this.webcamConfig.centerCrop){const t=1*this.webcamConfig.resizeWidth/this.webcamVideoElement.width,r=1*this.webcamConfig.resizeHeight/this.webcamVideoElement.height,s=(1-t)/2,n=(1-r)/2,i=s+t,a=r+n;this.cropBox=e.tensor2d([n,s,a,i],[1,4])}else this.cropBox=e.tensor2d([0,0,1,1],[1,4])}summary(){return"webcam"}static async create(t,r={}){if(!e.env().get("IS_BROWSER"))throw new Error("tf.data.webcam is only supported in browser environment.");if(!t){if(t=document.createElement("video"),!r.resizeWidth||!r.resizeHeight)throw new Error("Please provide webcam video element, or resizeWidth and resizeHeight to create a hidden video element.");t.width=r.resizeWidth,t.height=r.resizeHeight}const s=new nt(t,r);return await s.start(),s}async start(){this.webcamConfig.facingMode&&e.util.assert("user"===this.webcamConfig.facingMode||"environment"===this.webcamConfig.facingMode,(()=>`Invalid webcam facing mode: ${this.webcamConfig.facingMode}. Please provide 'user' or 'environment'`));try{this.stream=await navigator.mediaDevices.getUserMedia({video:{deviceId:this.webcamConfig.deviceId,facingMode:this.webcamConfig.facingMode?this.webcamConfig.facingMode:"user",width:this.webcamVideoElement.width,height:this.webcamVideoElement.height}})}catch(t){throw t.message=`Error thrown while initializing video stream: ${t.message}`,t}if(!this.stream)throw new Error("Could not obtain video from webcam.");try{this.webcamVideoElement.srcObject=this.stream}catch(t){console.log(t),this.webcamVideoElement.src=window.URL.createObjectURL(this.stream)}return this.webcamVideoElement.play(),this.isClosed=!1,new Promise((t=>{this.webcamVideoElement.onloadedmetadata=()=>{t()}}))}async next(){if(this.isClosed)return{value:null,done:!0};let t;try{t=e.browser.fromPixels(this.webcamVideoElement)}catch(t){throw new Error(`Error thrown converting video to pixels: ${JSON.stringify(t)}`)}if(!this.resize)return{value:t,done:!1};try{return{value:this.cropAndResizeFrame(t),done:!1}}catch(t){throw new Error(`Error thrown cropping the video: ${t.message}`)}finally{t.dispose()}}needToResize(){return!(!this.webcamConfig.resizeWidth||!this.webcamConfig.resizeHeight||this.webcamVideoElement.width===this.webcamConfig.resizeWidth&&this.webcamVideoElement.height===this.webcamConfig.resizeHeight)}cropAndResizeFrame(t){return e.tidy((()=>{const r=e.expandDims(e.cast(t,"float32"),0);let s;s=e.image.cropAndResize(r,this.cropBox,this.cropBoxInd,this.cropSize,"bilinear");const n=s.shape;return e.reshape(s,n.slice(1))}))}async capture(){return(await this.next()).value}stop(){this.stream.getTracks().forEach((t=>t.stop()));try{this.webcamVideoElement.srcObject=null}catch(t){console.log(t),this.webcamVideoElement.src=null}this.isClosed=!0}toArray(){throw new Error("Can not convert infinite video stream to array.")}}class it{}class at extends k{split(t){return new ot(this,t)}}class ot extends at{constructor(t,e){super(),this.upstream=t,this.impl=new ut(t,e)}summary(){return this.impl.summary()}async next(){return this.impl.next()}}class ut extends P{constructor(t,e){super(),this.upstream=t,this.separator=e,this.carryover=""}summary(){return`${this.upstream.summary()} -> Split('${this.separator}')`}async pump(){const t=await this.upstream.next();if(t.done)return""!==this.carryover&&(this.outputQueue.push(this.carryover),this.carryover="",!0);const e=t.value.split(this.separator);e[0]=this.carryover+e[0];for(const t of e.slice(0,-1))this.outputQueue.push(t);return this.carryover=e[e.length-1],!0}}class ht extends k{decodeUTF8(){return new lt(this)}}class lt extends at{constructor(t){super(),this.upstream=t,this.impl=new ct(t)}summary(){return this.impl.summary()}async next(){return this.impl.next()}}class ct extends P{constructor(t){if(super(),this.upstream=t,e.env().get("IS_BROWSER"))this.decoder=new TextDecoder("utf-8");else{const{StringDecoder:t}=require("string_decoder");this.decoder=new t("utf8")}}summary(){return`${this.upstream.summary()} -> Utf8`}async pump(){const t=await this.upstream.next();let r,s;return!t.done&&(r=t.value,s=e.env().get("IS_BROWSER")?this.decoder.decode(r,{stream:!0}):this.decoder.write(Buffer.from(r.buffer)),this.outputQueue.push(s),!0)}}class ft extends ht{constructor(t,r={}){super(),this.file=t,this.options=r,e.util.assert(t instanceof Uint8Array||!!e.env().get("IS_BROWSER")&&(t instanceof File||t instanceof Blob),(()=>"FileChunkIterator only supports File, Blob and Uint8Array right now.")),this.offset=r.offset||0,this.chunkSize=r.chunkSize||1048576}summary(){return`FileChunks ${this.file}`}async next(){if(this.offset>=(this.file instanceof Uint8Array?this.file.byteLength:this.file.size))return{value:null,done:!0};const t=new Promise(((t,e)=>{const r=this.offset+this.chunkSize;if(this.file instanceof Uint8Array)t(new Uint8Array(this.file.slice(this.offset,r)));else{const s=new FileReader;s.onload=r=>{let n=s.result;if(n instanceof ArrayBuffer&&(n=new Uint8Array(n)),!(n instanceof Uint8Array))return e(new TypeError("FileReader returned unknown type."));t(n)},s.onabort=t=>e(new Error("Aborted")),s.onerror=t=>e(new Error(t.type));const n=this.file.slice(this.offset,r);s.readAsArrayBuffer(n)}this.offset=r}));return{value:await t,done:!1}}}const dt=t=>({method:t.method,headers:t.headers,body:t.body,mode:t.mode,credentials:t.credentials,cache:t.cache,redirect:t.redirect,referrer:t.referrer,integrity:t.integrity});function mt(t){return"string"==typeof t&&"file://"===t.slice(0,7)}class pt extends it{constructor(t,e={}){super(),this.input=t,this.options=e}async iterator(){if(mt(this.input)&&e.env().get("IS_NODE")){const t=require("fs");this.input=t.readFileSync(this.input.slice(7))}return new ft(this.input,this.options)}}class wt extends it{constructor(t,e={}){super(),this.url=t,this.fileOptions=e}async 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dist/tf-data.fesm.min.js

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next(){if(this.trav>=this.items.length)return{value:null,done:!0};const t=this.items[this.trav];return this.trav++,{value:N(t),done:!1}}}class $ extends j{constructor(t){super(),this.nextFn=t}summary(){return"Function call"}async next(){try{return this.nextFn()}catch(t){throw t.message=`Error thrown while iterating through a dataset: ${t.message}`,t}}}class H extends j{constructor(t){super(),this.upstream=t,this.lastRead=Promise.resolve({value:null,done:!1})}summary(){return`${this.upstream.summary()} -> Serial`}async next(){return this.lastRead=this.lastRead.then((()=>this.serialNext())),this.lastRead}async serialNext(){return this.upstream.next()}}class q extends j{constructor(t,e){super(),this.upstream=t,this.maxCount=e,this.count=0,this.lastRead=Promise.resolve({value:null,done:!1})}summary(){return`${this.upstream.summary()} -> Skip`}async next(){return this.lastRead=this.lastRead.then((()=>this.serialNext())),this.lastRead}async serialNext(){for(;this.count++<this.maxCount;){const e=await this.upstream.next();if(e.done)return e;t.dispose(e.value)}return this.upstream.next()}}class L extends j{constructor(t,e){super(),this.upstream=t,this.maxCount=e,this.count=0}summary(){return`${this.upstream.summary()} -> Take`}async next(){return this.count++>=this.maxCount?{value:null,done:!0}:this.upstream.next()}}class P extends j{constructor(t,e,r=!0){super(),this.upstream=t,this.batchSize=e,this.enableSmallLastBatch=r,this.lastRead=Promise.resolve({value:null,done:!1})}summary(){return`${this.upstream.summary()} -> RowMajorBatch`}async next(){return this.lastRead=this.lastRead.then((()=>this.serialNext())),this.lastRead}async serialNext(){const t=[];for(;t.length<this.batchSize;){const e=await this.upstream.next();if(e.done)return this.enableSmallLastBatch&&t.length>0?{value:t,done:!1}:{value:null,done:!0};t.push(e.value)}return{value:t,done:!1}}}class W extends j{constructor(t,e){super(),this.upstream=t,this.predicate=e,this.lastRead=Promise.resolve({value:null,done:!1})}summary(){return`${this.upstream.summary()} -> Filter`}async next(){return this.lastRead=this.lastRead.then((()=>this.serialNext())),this.lastRead}async serialNext(){for(;;){const e=await this.upstream.next();if(e.done||this.predicate(e.value))return e;t.dispose(e.value)}}}class V extends j{constructor(t,e){super(),this.upstream=t,this.transform=e}summary(){return`${this.upstream.summary()} -> Map`}async next(){const e=await this.upstream.next();if(e.done)return{value:null,done:!0};const r=t.tensor_util.getTensorsInContainer(e.value),s=this.transform(e.value),n=t.tensor_util.getTensorsInContainer(s);for(const e of r)t.tensor_util.isTensorInList(e,n)||e.dispose();return{value:s,done:!1}}}class U extends j{constructor(t,e){super(),this.upstream=t,this.handler=e,this.count=0,this.lastRead=Promise.resolve({value:null,done:!1})}summary(){return`${this.upstream.summary()} -> handleErrors`}async next(){return this.lastRead=this.lastRead.then((()=>this.serialNext())),this.lastRead}async serialNext(){for(;;)try{return await this.upstream.next()}catch(t){if(!this.handler(t))return{value:null,done:!0}}}}class Q extends j{constructor(t,e){super(),this.upstream=t,this.transform=e}summary(){return`${this.upstream.summary()} -> AsyncMap`}async next(){const e=await this.upstream.next();if(e.done)return{value:null,done:!0};const r=t.tensor_util.getTensorsInContainer(e.value),s=await this.transform(e.value),n=t.tensor_util.getTensorsInContainer(s);for(const e of r)t.tensor_util.isTensorInList(e,n)||e.dispose();return{value:s,done:!1}}}class X extends j{constructor(){super(),this.outputQueue=new D,this.lastRead=Promise.resolve({value:null,done:!1})}async next(){return this.lastRead=this.lastRead.then((()=>this.serialNext())),this.lastRead}async serialNext(){for(;0===this.outputQueue.length();)if(!await this.pump())return{value:null,done:!0};return{value:this.outputQueue.shift(),done:!1}}}class G extends X{constructor(t,e){super(),this.upstream=t,this.transform=e}summary(){return`${this.upstream.summary()} -> Flatmap`}async pump(){const e=await this.upstream.next();if(e.done)return!1;const r=t.tensor_util.getTensorsInContainer(e.value),s=this.transform(e.value),n=t.tensor_util.getTensorsInContainer(s);this.outputQueue.pushAll(s);for(const e of r)t.tensor_util.isTensorInList(e,n)||e.dispose();return!0}}class Z extends j{constructor(t,e){super(),this.baseErrorHandler=e,this.lastRead=null,this.iterator=null,this.moreIterators=t}summary(){return"TODO: fill in upstream of chained summaries -> Chained"}async next(){return this.lastRead=this.readFromChain(this.lastRead),this.lastRead}async readFromChain(t){if(await t,null==this.iterator){const t=await this.moreIterators.next();if(t.done)return{value:null,done:!0};this.iterator=t.value,null!=this.baseErrorHandler&&(this.iterator=this.iterator.handleErrors(this.baseErrorHandler))}const e=await this.iterator.next();return e.done?(this.iterator=null,this.readFromChain(t)):e}}!function(t){t[t.FAIL=0]="FAIL",t[t.SHORTEST=1]="SHORTEST",t[t.LONGEST=2]="LONGEST"}(z||(z={}));class J extends j{constructor(t,e=z.FAIL){super(),this.iterators=t,this.mismatchMode=e,this.count=0,this.currentPromise=null}summary(){return"{TODO: fill in upstream of zip summaries} -> Zip"}async nextState(t){await t;let e=0,r=0;const s=await k(this.iterators,(function(t){if(t instanceof j){return{value:t.next().then((t=>(e++,t.done&&r++,t.value))),recurse:!1}}return{value:null,recurse:!0}}));if(e===r)return{value:null,done:!0};if(r>0)switch(this.mismatchMode){case z.FAIL:throw new Error(`Zipped streams should have the same length. Mismatched at element ${this.count}.`);case z.SHORTEST:return{value:null,done:!0};case z.LONGEST:}return this.count++,{value:s,done:!1}}async next(){return this.currentPromise=this.nextState(this.currentPromise),this.currentPromise}}class Y extends j{constructor(t,e){super(),this.upstream=t,this.bufferSize=e,this.buffer=new _(e)}summary(){return`${this.upstream.summary()} -> Prefetch`}refill(){for(;!this.buffer.isFull();){const t=this.upstream.next();this.buffer.push(t)}}next(){return this.refill(),this.buffer.shift()}}class K extends Y{constructor(e,r,s){super(e,r),this.upstream=e,this.windowSize=r,this.upstreamExhausted=!1,this.random=E.alea(s||t.util.now().toString()),this.lastRead=Promise.resolve({value:null,done:!1})}async next(){return this.lastRead=this.lastRead.then((()=>this.serialNext())),this.lastRead}randomInt(t){return Math.floor(this.random()*t)}chooseIndex(){return this.randomInt(this.buffer.length())}async serialNext(){for(this.upstreamExhausted||this.refill();!this.buffer.isEmpty();){const t=this.chooseIndex(),e=await this.buffer.shuffleExcise(t);if(!e.done)return this.refill(),e;this.upstreamExhausted=!0}return{value:null,done:!0}}}class tt{constructor(){this.size=null}batch(e,r=!0){const s=this;let n;return t.util.assert(e>0,(()=>`batchSize needs to be positive, but it is\n      ${e}`)),n=this.size===1/0||null==this.size?this.size:r?Math.ceil(this.size/e):Math.floor(this.size/e),et((async()=>(await s.iterator()).columnMajorBatch(e,r,nt)),n)}concatenate(t){const e=this;let r;return r=this.size===1/0||t.size===1/0?1/0:null!=this.size&&null!=t.size?this.size+t.size:null,et((async()=>(await e.iterator()).concatenate(await t.iterator())),r)}filter(e){const r=this;let s;return s=this.size===1/0?1/0:null,et((async()=>(await r.iterator()).filter((r=>t.tidy((()=>e(r)))))),s)}async forEachAsync(t){return(await this.iterator()).forEachAsync(t)}map(e){const r=this;return et((async()=>(await r.iterator()).map((r=>t.tidy((()=>e(r)))))),this.size)}mapAsync(t){const e=this;return et((async()=>(await e.iterator()).mapAsync(t)),this.size)}prefetch(t){if(null==t)throw new RangeError("`Dataset.prefetch()` requires bufferSize to be specified.");const e=this;return et((async()=>(await e.iterator()).prefetch(t)),this.size)}repeat(t){const e=this;let r;return r=null!=this.size&&t>0?this.size*t:0===t?0:null!=this.size&&(void 0===t||t<0)?1/0:null,et((async()=>{const r=M((async()=>({value:await e.iterator(),done:!1})));return s=r.take(t),new Z(s,n);var s,n}),r)}skip(t){const e=this;let r;return r=null!=this.size&&t>=0&&this.size>=t?this.size-t:null!=this.size&&(this.size<t||void 0===t||t<0)?0:null,et((async()=>(await e.iterator()).skip(t)),r)}shuffle(e,r,s=!0){if(null==e||e<0)throw null==this.size?new RangeError("`Dataset.shuffle()` requires bufferSize to be specified."):new RangeError(`\`Dataset.shuffle()\` requires bufferSize to be specified.  If your data fits in main memory (for regular JS objects), and/or GPU memory (for \`tf.Tensor\`s), consider setting bufferSize to the dataset size (${this.size} elements)`);const n=this,i=E.alea(r||t.util.now().toString());return et((async()=>{let t=i.int32();return s&&(t+=i.int32()),(await n.iterator()).shuffle(e,t.toString())}),this.size)}take(t){const e=this;let r;return r=null!=this.size&&this.size>t?t:null!=this.size&&this.size<=t?this.size:null,et((async()=>(await e.iterator()).take(t)),r)}async toArray(){if(this.size===1/0)throw new Error("Can not convert infinite data stream to array.");return(await this.iterator()).toArray()}async toArrayForTest(){if(this.size===1/0)throw new Error("Can not convert infinite data stream to array.");return(await this.iterator()).toArrayForTest()}}function et(t,e=null){return new class extends tt{constructor(){super(...arguments),this.size=e}async iterator(){return t()}}}function rt(t){return et((async()=>O(t)),t.length)}function st(t){if(!F(t))throw new Error("The argument to zip() must be an object or array.");let e;if(Array.isArray(t))for(let r=0;r<t.length;r++)e=null==e?t[r].size:Math.min(e,t[r].size);else if(t instanceof Object)for(const r in t)e=null==e?t[r].size:Math.min(e,t[r].size);return et((async()=>function(t,e=z.FAIL){return new J(t,e)}(await k(t,(t=>{if(t instanceof tt)return{value:t.iterator(),recurse:!1};if(F(t))return{value:null,recurse:!0};throw new Error("Leaves of the structure passed to zip() must be Datasets, not primitives.")})),z.SHORTEST)),e)}function nt(e){if(null===e)return null;const r=e[0];if(null==(s=r)||null===(n=s)||"object"!=typeof n&&"function"!=typeof n||Array.isArray(s)||"object"==typeof s&&s instanceof t.Tensor||t.util.isTypedArray(s)){return{value:function(e){if(0===e.length)throw new Error("Can't make a batch of zero elements.");return e[0]instanceof t.Tensor?t.stack(e):t.tensor(e)}(e),recurse:!1}}var s,n;return{value:null,recurse:!0}}tt.MAX_BUFFER_SIZE=1e4;class it extends tt{constructor(t){super(),this.input=t}async iterator(){return(await this.input.iterator()).decodeUTF8().split("\n").map((t=>(t.endsWith("\r")&&(t=t.slice(0,-1)),t)))}}const at=Symbol("out"),ot=Symbol("field"),ut=Symbol("quote"),ht=Symbol("quoteafterquote"),lt=Symbol("quoteinquote");class ct extends tt{constructor(t,r){super(),this.input=t,this.hasHeader=!0,this.fullColumnNames=null,this.columnNamesValidated=!1,this.columnConfigs=null,this.configuredColumnsOnly=!1,this.delimiter=",",this.delimWhitespace=!1,this.base=new it(t),r||(r={}),this.hasHeader=!1!==r.hasHeader,this.fullColumnNames=r.columnNames,this.columnConfigs=r.columnConfigs,this.configuredColumnsOnly=r.configuredColumnsOnly,r.delimWhitespace?(e.assert(null==r.delimiter,(()=>"Delimiter should not be provided when delimWhitespace is true.")),this.delimWhitespace=!0,this.delimiter=" "):this.delimiter=r.delimiter?r.delimiter:","}async columnNames(){return this.columnNamesValidated||await this.setColumnNames(),this.configuredColumnsOnly?Object.keys(this.columnConfigs):this.fullColumnNames}async setColumnNames(){const t=await this.maybeReadHeaderLine();if(!this.fullColumnNames&&!t)throw new Error("Column names must be provided if there is no header line.");this.fullColumnNames&&t&&e.assert(t.length===this.fullColumnNames.length,(()=>"The length of provided columnNames ("+this.fullColumnNames.length.toString()+") does not match the length of the header line read from file ("+t.length.toString()+").")),this.fullColumnNames||(this.fullColumnNames=t);const r=this.fullColumnNames.reduce(((t,e)=>(t[e]=t[e]+1||1,t)),{}),s=Object.keys(r).filter((t=>r[t]>1));if(e.assert(0===s.length,(()=>"Duplicate column names found: "+s.toString())),this.columnConfigs)for(const t of Object.keys(this.columnConfigs)){if(-1===this.fullColumnNames.indexOf(t))throw new Error('The key "'+t+'" provided in columnConfigs does not match any of the column names ('+this.fullColumnNames.toString()+").")}this.columnNamesValidated=!0}async maybeReadHeaderLine(){if(this.hasHeader){const t=await this.base.iterator(),e=await t.next();if(e.done)throw new Error("No data was found for CSV parsing.");const r=e.value;return this.parseRow(r,!1)}return null}async iterator(){this.columnNamesValidated||await this.setColumnNames();let t=await this.base.iterator();return this.hasHeader&&(t=t.skip(1)),t.map((t=>this.makeDataElement(t)))}makeDataElement(t){const e=this.parseRow(t),r={},s={};for(let n=0;n<this.fullColumnNames.length;n++){const i=this.fullColumnNames[n],a=this.columnConfigs?this.columnConfigs[i]:null;if(!this.configuredColumnsOnly||a){const o=e[n];let u=null;if(""===o)if(a&&void 0!==a.default)u=a.default;else{if(a&&(a.required||a.isLabel))throw new Error(`Required column ${i} is empty in this line: ${t}`);u=void 0}else{const t=Number(o);if(isNaN(t))u=a&&"bool"===a.dtype?this.getBoolean(o):o;else if(a&&a.dtype)switch(a.dtype){case"float32":default:u=t;break;case"int32":u=Math.floor(t);break;case"bool":u=this.getBoolean(o)}else u=t}a&&a.isLabel?s[i]=u:r[i]=u}}return 0===Object.keys(s).length?r:{xs:r,ys:s}}getBoolean(t){return"1"===t||"true"===t.toLowerCase()?1:0}parseRow(t,e=!0){const r=[];let s=0;const n=t.length;let i=at;for(let e=0;e<n;e++)switch(i){case at:switch(t.charAt(e)){case'"':s=e+1,i=ut;break;case this.delimiter:if(s=e+1," "===this.delimiter&&this.delimWhitespace)break;r.push(""),i=at;break;default:i=ot,s=e}break;case ot:if(t.charAt(e)===this.delimiter)r.push(t.substring(s,e)),i=at,s=e+1;break;case ut:if('"'===t.charAt(e))i=ht;break;case ht:switch(t.charAt(e)){case this.delimiter:r.push(t.substring(s,e-1)),i=at,s=e+1;break;case'"':i=ut;break;default:i=lt}break;case lt:if('"'===t.charAt(e))i=ut}if(i===ht?r.push(t.substring(s,n-1)):r.push(t.substring(s)),e&&r.length!==this.fullColumnNames.length)throw new Error(`Invalid row in csv file. Should have ${this.fullColumnNames.length} elements in a row, but got ${r}`);return r}}class ft extends j{constructor(t){super(),this.microphoneConfig=t,this.isClosed=!1,this.fftSize=t.fftSize||1024;const e=Math.log2(this.fftSize);if(this.fftSize<0||e<4||e>14||!Number.isInteger(e))throw new Error(`Invalid fftSize: it must be a power of 2 between 2 to 4 and 2 to 14, but got ${this.fftSize}`);if(this.numFrames=t.numFramesPerSpectrogram||43,this.sampleRateHz=t.sampleRateHz,this.columnTruncateLength=t.columnTruncateLength||this.fftSize,this.audioTrackConstraints=t.audioTrackConstraints,this.smoothingTimeConstant=t.smoothingTimeConstant||0,this.includeSpectrogram=!1!==t.includeSpectrogram,this.includeWaveform=!0===t.includeWaveform,!this.includeSpectrogram&&!this.includeWaveform)throw new Error("Both includeSpectrogram and includeWaveform are false. At least one type of data should be returned.")}summary(){return"microphone"}static async create(t={}){if(!r().get("IS_BROWSER"))throw new Error("microphone API is only supported in browser environment.");const e=new ft(t);return await e.start(),e}async start(){try{this.stream=await navigator.mediaDevices.getUserMedia({audio:null==this.audioTrackConstraints||this.audioTrackConstraints,video:!1})}catch(t){throw new Error(`Error thrown while initializing video stream: ${t.message}`)}if(!this.stream)throw new Error("Could not obtain audio from microphone.");const t=window.AudioContext||window.webkitAudioContext;if(this.audioContext=new t,this.sampleRateHz){if(this.audioContext.sampleRate!==this.sampleRateHz)throw new Error(`Mismatch in sampling rate: Expected: ${this.sampleRateHz}; Actual: ${this.audioContext.sampleRate}`)}else this.sampleRateHz=this.audioContext.sampleRate;const e=this.audioContext.createMediaStreamSource(this.stream);this.analyser=this.audioContext.createAnalyser(),this.analyser.fftSize=2*this.fftSize,this.analyser.smoothingTimeConstant=this.smoothingTimeConstant,e.connect(this.analyser),this.freqData=new Float32Array(this.fftSize),this.timeData=new Float32Array(this.fftSize)}async next(){if(this.isClosed)return{value:null,done:!0};let t,e;const r=await this.getAudioData();if(this.includeSpectrogram){const e=this.flattenQueue(r.freqDataQueue);t=this.getTensorFromAudioDataArray(e,[this.numFrames,this.columnTruncateLength,1])}if(this.includeWaveform){const t=this.flattenQueue(r.timeDataQueue);e=this.getTensorFromAudioDataArray(t,[this.numFrames*this.fftSize,1])}return{value:{spectrogram:t,waveform:e},done:!1}}async capture(){return(await this.next()).value}async getAudioData(){const t=[],e=[];let r=0;return new Promise((s=>{const n=setInterval((()=>{this.includeSpectrogram&&(this.analyser.getFloatFrequencyData(this.freqData),this.freqData[0]===-1/0&&s({freqDataQueue:t,timeDataQueue:e}),t.push(this.freqData.slice(0,this.columnTruncateLength))),this.includeWaveform&&(this.analyser.getFloatTimeDomainData(this.timeData),e.push(this.timeData.slice())),++r===this.numFrames&&(clearInterval(n),s({freqDataQueue:t,timeDataQueue:e}))}),this.fftSize/this.sampleRateHz*1e3)}))}stop(){this.isClosed||(this.isClosed=!0,this.analyser.disconnect(),this.audioContext.close(),null!=this.stream&&this.stream.getTracks().length>0&&this.stream.getTracks()[0].stop())}toArray(){throw new Error("Can not convert infinite audio stream to array.")}getSampleRate(){return this.sampleRateHz}flattenQueue(t){const e=t[0].length,r=new Float32Array(t.length*e);return t.forEach(((t,s)=>r.set(t,s*e))),r}getTensorFromAudioDataArray(t,r){const n=new Float32Array(e.sizeFromShape(r));return n.set(t,n.length-t.length),s(n,r)}}class mt extends j{constructor(t,e){if(super(),this.webcamVideoElement=t,this.webcamConfig=e,this.isClosed=!0,this.resize=!1,this.needToResize())if(this.resize=!0,this.cropSize=[this.webcamConfig.resizeHeight,this.webcamConfig.resizeWidth],this.cropBoxInd=n([0],"int32"),this.webcamConfig.centerCrop){const t=1*this.webcamConfig.resizeWidth/this.webcamVideoElement.width,e=1*this.webcamConfig.resizeHeight/this.webcamVideoElement.height,r=(1-t)/2,s=(1-e)/2,n=r+t,a=e+s;this.cropBox=i([s,r,a,n],[1,4])}else this.cropBox=i([0,0,1,1],[1,4])}summary(){return"webcam"}static async create(t,e={}){if(!r().get("IS_BROWSER"))throw new Error("tf.data.webcam is only supported in browser environment.");if(!t){if(t=document.createElement("video"),!e.resizeWidth||!e.resizeHeight)throw new Error("Please provide webcam video element, or resizeWidth and resizeHeight to create a hidden video element.");t.width=e.resizeWidth,t.height=e.resizeHeight}const s=new mt(t,e);return await s.start(),s}async start(){this.webcamConfig.facingMode&&e.assert("user"===this.webcamConfig.facingMode||"environment"===this.webcamConfig.facingMode,(()=>`Invalid webcam facing mode: ${this.webcamConfig.facingMode}. Please provide 'user' or 'environment'`));try{this.stream=await navigator.mediaDevices.getUserMedia({video:{deviceId:this.webcamConfig.deviceId,facingMode:this.webcamConfig.facingMode?this.webcamConfig.facingMode:"user",width:this.webcamVideoElement.width,height:this.webcamVideoElement.height}})}catch(t){throw t.message=`Error thrown while initializing video stream: ${t.message}`,t}if(!this.stream)throw new Error("Could not obtain video from webcam.");try{this.webcamVideoElement.srcObject=this.stream}catch(t){console.log(t),this.webcamVideoElement.src=window.URL.createObjectURL(this.stream)}return this.webcamVideoElement.play(),this.isClosed=!1,new Promise((t=>{this.webcamVideoElement.onloadedmetadata=()=>{t()}}))}async next(){if(this.isClosed)return{value:null,done:!0};let t;try{t=a.fromPixels(this.webcamVideoElement)}catch(t){throw new Error(`Error thrown converting video to pixels: ${JSON.stringify(t)}`)}if(!this.resize)return{value:t,done:!1};try{return{value:this.cropAndResizeFrame(t),done:!1}}catch(t){throw new Error(`Error thrown cropping the video: ${t.message}`)}finally{t.dispose()}}needToResize(){return!(!this.webcamConfig.resizeWidth||!this.webcamConfig.resizeHeight||this.webcamVideoElement.width===this.webcamConfig.resizeWidth&&this.webcamVideoElement.height===this.webcamConfig.resizeHeight)}cropAndResizeFrame(t){return o((()=>{const e=u(h(t,"float32"),0);let r;r=l.cropAndResize(e,this.cropBox,this.cropBoxInd,this.cropSize,"bilinear");const s=r.shape;return c(r,s.slice(1))}))}async capture(){return(await this.next()).value}stop(){this.stream.getTracks().forEach((t=>t.stop()));try{this.webcamVideoElement.srcObject=null}catch(t){console.log(t),this.webcamVideoElement.src=null}this.isClosed=!0}toArray(){throw new Error("Can not convert infinite video stream to array.")}}class dt{}class pt extends j{split(t){return new wt(this,t)}}class wt extends pt{constructor(t,e){super(),this.upstream=t,this.impl=new yt(t,e)}summary(){return this.impl.summary()}async next(){return this.impl.next()}}class yt extends X{constructor(t,e){super(),this.upstream=t,this.separator=e,this.carryover=""}summary(){return`${this.upstream.summary()} -> Split('${this.separator}')`}async pump(){const t=await this.upstream.next();if(t.done)return""!==this.carryover&&(this.outputQueue.push(this.carryover),this.carryover="",!0);const e=t.value.split(this.separator);e[0]=this.carryover+e[0];for(const t of e.slice(0,-1))this.outputQueue.push(t);return this.carryover=e[e.length-1],!0}}class gt extends j{decodeUTF8(){return new xt(this)}}class xt extends pt{constructor(t){super(),this.upstream=t,this.impl=new vt(t)}summary(){return this.impl.summary()}async next(){return this.impl.next()}}class vt extends X{constructor(t){if(super(),this.upstream=t,r().get("IS_BROWSER"))this.decoder=new TextDecoder("utf-8");else{const{StringDecoder:t}=require("string_decoder");this.decoder=new t("utf8")}}summary(){return`${this.upstream.summary()} -> Utf8`}async pump(){const t=await this.upstream.next();let e,s;return!t.done&&(e=t.value,s=r().get("IS_BROWSER")?this.decoder.decode(e,{stream:!0}):this.decoder.write(Buffer.from(e.buffer)),this.outputQueue.push(s),!0)}}class bt extends gt{constructor(t,s={}){super(),this.file=t,this.options=s,e.assert(t instanceof Uint8Array||!!r().get("IS_BROWSER")&&(t instanceof File||t instanceof Blob),(()=>"FileChunkIterator only supports File, Blob and Uint8Array right now.")),this.offset=s.offset||0,this.chunkSize=s.chunkSize||1048576}summary(){return`FileChunks ${this.file}`}async next(){if(this.offset>=(this.file instanceof Uint8Array?this.file.byteLength:this.file.size))return{value:null,done:!0};const t=new Promise(((t,e)=>{const r=this.offset+this.chunkSize;if(this.file instanceof Uint8Array)t(new 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this.next()}async resolveWhile(t){let e=await this.next(),r=t(e.value);for(;!e.done&&r;)e=await this.next(),r=t(e.value)}handleErrors(t){return new U(this,t)}filter(t){return new W(this,t)}map(t){return new V(this,t)}mapAsync(t){return new Q(this,t)}serialMapAsync(t){return new Q(this,t).serial()}flatmap(t){return new G(this,t)}async forEachAsync(t){return this.map(t).resolveFully()}async serialForEach(t){return this.serialMapAsync(t).resolveWhile((t=>!0===t))}rowMajorBatch(t,e=!0){return new P(this,t,e)}columnMajorBatch(t,e=!0,r=T){return this.rowMajorBatch(t,e).map((t=>A(t,r)))}concatenate(t,e){return new Z(O([this,t]),e)}take(t){return t<0||null==t?this:new L(this,t)}skip(t){return t<0||null==t?this:new q(this,t)}prefetch(t){return new Y(this,t)}shuffle(t,e){return new K(this,t,e)}serial(){return new H(this)}}class B extends j{constructor(t){super(),this.items=t,this.trav=0}summary(){return`Array of ${this.items.length} items`}async next(){if(this.trav>=this.items.length)return{value:null,done:!0};const t=this.items[this.trav];return this.trav++,{value:N(t),done:!1}}}class $ extends j{constructor(t){super(),this.nextFn=t}summary(){return"Function call"}async next(){try{return this.nextFn()}catch(t){throw t.message=`Error thrown while iterating through a dataset: ${t.message}`,t}}}class H extends j{constructor(t){super(),this.upstream=t,this.lastRead=Promise.resolve({value:null,done:!1})}summary(){return`${this.upstream.summary()} -> Serial`}async next(){return this.lastRead=this.lastRead.then((()=>this.serialNext())),this.lastRead}async serialNext(){return this.upstream.next()}}class q extends j{constructor(t,e){super(),this.upstream=t,this.maxCount=e,this.count=0,this.lastRead=Promise.resolve({value:null,done:!1})}summary(){return`${this.upstream.summary()} -> Skip`}async next(){return this.lastRead=this.lastRead.then((()=>this.serialNext())),this.lastRead}async serialNext(){for(;this.count++<this.maxCount;){const e=await this.upstream.next();if(e.done)return e;t.dispose(e.value)}return this.upstream.next()}}class L extends j{constructor(t,e){super(),this.upstream=t,this.maxCount=e,this.count=0}summary(){return`${this.upstream.summary()} -> Take`}async next(){return this.count++>=this.maxCount?{value:null,done:!0}:this.upstream.next()}}class P extends j{constructor(t,e,r=!0){super(),this.upstream=t,this.batchSize=e,this.enableSmallLastBatch=r,this.lastRead=Promise.resolve({value:null,done:!1})}summary(){return`${this.upstream.summary()} -> RowMajorBatch`}async next(){return this.lastRead=this.lastRead.then((()=>this.serialNext())),this.lastRead}async serialNext(){const t=[];for(;t.length<this.batchSize;){const e=await this.upstream.next();if(e.done)return this.enableSmallLastBatch&&t.length>0?{value:t,done:!1}:{value:null,done:!0};t.push(e.value)}return{value:t,done:!1}}}class W extends j{constructor(t,e){super(),this.upstream=t,this.predicate=e,this.lastRead=Promise.resolve({value:null,done:!1})}summary(){return`${this.upstream.summary()} -> Filter`}async next(){return this.lastRead=this.lastRead.then((()=>this.serialNext())),this.lastRead}async serialNext(){for(;;){const e=await this.upstream.next();if(e.done||this.predicate(e.value))return e;t.dispose(e.value)}}}class V extends j{constructor(t,e){super(),this.upstream=t,this.transform=e}summary(){return`${this.upstream.summary()} -> Map`}async next(){const e=await this.upstream.next();if(e.done)return{value:null,done:!0};const r=t.tensor_util.getTensorsInContainer(e.value),s=this.transform(e.value),n=t.tensor_util.getTensorsInContainer(s);for(const e of r)t.tensor_util.isTensorInList(e,n)||e.dispose();return{value:s,done:!1}}}class U extends j{constructor(t,e){super(),this.upstream=t,this.handler=e,this.count=0,this.lastRead=Promise.resolve({value:null,done:!1})}summary(){return`${this.upstream.summary()} -> handleErrors`}async next(){return this.lastRead=this.lastRead.then((()=>this.serialNext())),this.lastRead}async serialNext(){for(;;)try{return await this.upstream.next()}catch(t){if(!this.handler(t))return{value:null,done:!0}}}}class Q extends j{constructor(t,e){super(),this.upstream=t,this.transform=e}summary(){return`${this.upstream.summary()} -> AsyncMap`}async next(){const e=await this.upstream.next();if(e.done)return{value:null,done:!0};const r=t.tensor_util.getTensorsInContainer(e.value),s=await this.transform(e.value),n=t.tensor_util.getTensorsInContainer(s);for(const e of r)t.tensor_util.isTensorInList(e,n)||e.dispose();return{value:s,done:!1}}}class X extends j{constructor(){super(),this.outputQueue=new D,this.lastRead=Promise.resolve({value:null,done:!1})}async next(){return this.lastRead=this.lastRead.then((()=>this.serialNext())),this.lastRead}async serialNext(){for(;0===this.outputQueue.length();)if(!await this.pump())return{value:null,done:!0};return{value:this.outputQueue.shift(),done:!1}}}class G extends X{constructor(t,e){super(),this.upstream=t,this.transform=e}summary(){return`${this.upstream.summary()} -> Flatmap`}async pump(){const e=await this.upstream.next();if(e.done)return!1;const r=t.tensor_util.getTensorsInContainer(e.value),s=this.transform(e.value),n=t.tensor_util.getTensorsInContainer(s);this.outputQueue.pushAll(s);for(const e of r)t.tensor_util.isTensorInList(e,n)||e.dispose();return!0}}class Z extends j{constructor(t,e){super(),this.baseErrorHandler=e,this.lastRead=null,this.iterator=null,this.moreIterators=t}summary(){return"TODO: fill in upstream of chained summaries -> Chained"}async next(){return this.lastRead=this.readFromChain(this.lastRead),this.lastRead}async readFromChain(t){if(await t,null==this.iterator){const t=await this.moreIterators.next();if(t.done)return{value:null,done:!0};this.iterator=t.value,null!=this.baseErrorHandler&&(this.iterator=this.iterator.handleErrors(this.baseErrorHandler))}const e=await this.iterator.next();return e.done?(this.iterator=null,this.readFromChain(t)):e}}!function(t){t[t.FAIL=0]="FAIL",t[t.SHORTEST=1]="SHORTEST",t[t.LONGEST=2]="LONGEST"}(z||(z={}));class J extends j{constructor(t,e=z.FAIL){super(),this.iterators=t,this.mismatchMode=e,this.count=0,this.currentPromise=null}summary(){return"{TODO: fill in upstream of zip summaries} -> Zip"}async nextState(t){await t;let e=0,r=0;const s=await k(this.iterators,(function(t){if(t instanceof j){return{value:t.next().then((t=>(e++,t.done&&r++,t.value))),recurse:!1}}return{value:null,recurse:!0}}));if(e===r)return{value:null,done:!0};if(r>0)switch(this.mismatchMode){case z.FAIL:throw new Error(`Zipped streams should have the same length. Mismatched at element ${this.count}.`);case z.SHORTEST:return{value:null,done:!0};case z.LONGEST:}return this.count++,{value:s,done:!1}}async next(){return this.currentPromise=this.nextState(this.currentPromise),this.currentPromise}}class Y extends j{constructor(t,e){super(),this.upstream=t,this.bufferSize=e,this.buffer=new _(e)}summary(){return`${this.upstream.summary()} -> Prefetch`}refill(){for(;!this.buffer.isFull();){const t=this.upstream.next();this.buffer.push(t)}}next(){return this.refill(),this.buffer.shift()}}class K extends Y{constructor(e,r,s){super(e,r),this.upstream=e,this.windowSize=r,this.upstreamExhausted=!1,this.random=E.alea(s||t.util.now().toString()),this.lastRead=Promise.resolve({value:null,done:!1})}async next(){return this.lastRead=this.lastRead.then((()=>this.serialNext())),this.lastRead}randomInt(t){return Math.floor(this.random()*t)}chooseIndex(){return this.randomInt(this.buffer.length())}async serialNext(){for(this.upstreamExhausted||this.refill();!this.buffer.isEmpty();){const t=this.chooseIndex(),e=await this.buffer.shuffleExcise(t);if(!e.done)return this.refill(),e;this.upstreamExhausted=!0}return{value:null,done:!0}}}class tt{constructor(){this.size=null}batch(e,r=!0){const s=this;let n;return t.util.assert(e>0,(()=>`batchSize needs to be positive, but it is\n      ${e}`)),n=this.size===1/0||null==this.size?this.size:r?Math.ceil(this.size/e):Math.floor(this.size/e),et((async()=>(await s.iterator()).columnMajorBatch(e,r,nt)),n)}concatenate(t){const e=this;let r;return r=this.size===1/0||t.size===1/0?1/0:null!=this.size&&null!=t.size?this.size+t.size:null,et((async()=>(await e.iterator()).concatenate(await t.iterator())),r)}filter(e){const r=this;let s;return s=this.size===1/0?1/0:null,et((async()=>(await r.iterator()).filter((r=>t.tidy((()=>e(r)))))),s)}async forEachAsync(t){return(await this.iterator()).forEachAsync(t)}map(e){const r=this;return et((async()=>(await r.iterator()).map((r=>t.tidy((()=>e(r)))))),this.size)}mapAsync(t){const e=this;return et((async()=>(await e.iterator()).mapAsync(t)),this.size)}prefetch(t){if(null==t)throw new RangeError("`Dataset.prefetch()` requires bufferSize to be specified.");const e=this;return et((async()=>(await e.iterator()).prefetch(t)),this.size)}repeat(t){const e=this;let r;return r=null!=this.size&&t>0?this.size*t:0===t?0:null!=this.size&&(void 0===t||t<0)?1/0:null,et((async()=>{const r=M((async()=>({value:await e.iterator(),done:!1})));return s=r.take(t),new Z(s,n);var s,n}),r)}skip(t){const e=this;let r;return r=null!=this.size&&t>=0&&this.size>=t?this.size-t:null!=this.size&&(this.size<t||void 0===t||t<0)?0:null,et((async()=>(await e.iterator()).skip(t)),r)}shuffle(e,r,s=!0){if(null==e||e<0)throw null==this.size?new RangeError("`Dataset.shuffle()` requires bufferSize to be specified."):new RangeError(`\`Dataset.shuffle()\` requires bufferSize to be specified.  If your data fits in main memory (for regular JS objects), and/or GPU memory (for \`tf.Tensor\`s), consider setting bufferSize to the dataset size (${this.size} elements)`);const n=this,i=E.alea(r||t.util.now().toString());return et((async()=>{let t=i.int32();return s&&(t+=i.int32()),(await n.iterator()).shuffle(e,t.toString())}),this.size)}take(t){const e=this;let r;return r=null!=this.size&&this.size>t?t:null!=this.size&&this.size<=t?this.size:null,et((async()=>(await e.iterator()).take(t)),r)}async toArray(){if(this.size===1/0)throw new Error("Can not convert infinite data stream to array.");return(await this.iterator()).toArray()}async toArrayForTest(){if(this.size===1/0)throw new Error("Can not convert infinite data stream to array.");return(await this.iterator()).toArrayForTest()}}function et(t,e=null){return new class extends tt{constructor(){super(...arguments),this.size=e}async iterator(){return t()}}}function rt(t){return et((async()=>O(t)),t.length)}function st(t){if(!F(t))throw new Error("The argument to zip() must be an object or array.");let e;if(Array.isArray(t))for(let r=0;r<t.length;r++)e=null==e?t[r].size:Math.min(e,t[r].size);else if(t instanceof Object)for(const r in t)e=null==e?t[r].size:Math.min(e,t[r].size);return et((async()=>function(t,e=z.FAIL){return new J(t,e)}(await k(t,(t=>{if(t instanceof tt)return{value:t.iterator(),recurse:!1};if(F(t))return{value:null,recurse:!0};throw new Error("Leaves of the structure passed to zip() must be Datasets, not primitives.")})),z.SHORTEST)),e)}function nt(e){if(null===e)return null;const r=e[0];if(null==(s=r)||null===(n=s)||"object"!=typeof n&&"function"!=typeof n||Array.isArray(s)||"object"==typeof s&&s instanceof t.Tensor||t.util.isTypedArray(s)){return{value:function(e){if(0===e.length)throw new Error("Can't make a batch of zero elements.");return e[0]instanceof t.Tensor?t.stack(e):t.tensor(e)}(e),recurse:!1}}var s,n;return{value:null,recurse:!0}}tt.MAX_BUFFER_SIZE=1e4;class it extends tt{constructor(t){super(),this.input=t}async iterator(){return(await this.input.iterator()).decodeUTF8().split("\n").map((t=>(t.endsWith("\r")&&(t=t.slice(0,-1)),t)))}}const at=Symbol("out"),ot=Symbol("field"),ut=Symbol("quote"),ht=Symbol("quoteafterquote"),lt=Symbol("quoteinquote");class ct extends tt{async columnNames(){return this.columnNamesValidated||await this.setColumnNames(),this.configuredColumnsOnly?Object.keys(this.columnConfigs):this.fullColumnNames}async setColumnNames(){const t=await this.maybeReadHeaderLine();if(!this.fullColumnNames&&!t)throw new Error("Column names must be provided if there is no header line.");this.fullColumnNames&&t&&e.assert(t.length===this.fullColumnNames.length,(()=>"The length of provided columnNames ("+this.fullColumnNames.length.toString()+") does not match the length of the header line read from file ("+t.length.toString()+").")),this.fullColumnNames||(this.fullColumnNames=t);const r=this.fullColumnNames.reduce(((t,e)=>(t[e]=t[e]+1||1,t)),{}),s=Object.keys(r).filter((t=>r[t]>1));if(e.assert(0===s.length,(()=>"Duplicate column names found: "+s.toString())),this.columnConfigs)for(const t of Object.keys(this.columnConfigs)){if(-1===this.fullColumnNames.indexOf(t))throw new Error('The key "'+t+'" provided in columnConfigs does not match any of the column names ('+this.fullColumnNames.toString()+").")}this.columnNamesValidated=!0}async maybeReadHeaderLine(){if(this.hasHeader){const t=await this.base.iterator(),e=await t.next();if(e.done)throw new Error("No data was found for CSV parsing.");const r=e.value;return this.parseRow(r,!1)}return null}constructor(t,r){super(),this.input=t,this.hasHeader=!0,this.fullColumnNames=null,this.columnNamesValidated=!1,this.columnConfigs=null,this.configuredColumnsOnly=!1,this.delimiter=",",this.delimWhitespace=!1,this.base=new it(t),r||(r={}),this.hasHeader=!1!==r.hasHeader,this.fullColumnNames=r.columnNames,this.columnConfigs=r.columnConfigs,this.configuredColumnsOnly=r.configuredColumnsOnly,r.delimWhitespace?(e.assert(null==r.delimiter,(()=>"Delimiter should not be provided when delimWhitespace is true.")),this.delimWhitespace=!0,this.delimiter=" "):this.delimiter=r.delimiter?r.delimiter:","}async iterator(){this.columnNamesValidated||await this.setColumnNames();let t=await this.base.iterator();return this.hasHeader&&(t=t.skip(1)),t.map((t=>this.makeDataElement(t)))}makeDataElement(t){const e=this.parseRow(t),r={},s={};for(let n=0;n<this.fullColumnNames.length;n++){const i=this.fullColumnNames[n],a=this.columnConfigs?this.columnConfigs[i]:null;if(!this.configuredColumnsOnly||a){const o=e[n];let u=null;if(""===o)if(a&&void 0!==a.default)u=a.default;else{if(a&&(a.required||a.isLabel))throw new Error(`Required column ${i} is empty in this line: ${t}`);u=void 0}else{const t=Number(o);if(isNaN(t))u=a&&"bool"===a.dtype?this.getBoolean(o):o;else if(a&&a.dtype)switch(a.dtype){case"float32":default:u=t;break;case"int32":u=Math.floor(t);break;case"bool":u=this.getBoolean(o)}else u=t}a&&a.isLabel?s[i]=u:r[i]=u}}return 0===Object.keys(s).length?r:{xs:r,ys:s}}getBoolean(t){return"1"===t||"true"===t.toLowerCase()?1:0}parseRow(t,e=!0){const r=[];let s=0;const n=t.length;let i=at;for(let e=0;e<n;e++)switch(i){case at:switch(t.charAt(e)){case'"':s=e+1,i=ut;break;case this.delimiter:if(s=e+1," "===this.delimiter&&this.delimWhitespace)break;r.push(""),i=at;break;default:i=ot,s=e}break;case ot:if(t.charAt(e)===this.delimiter)r.push(t.substring(s,e)),i=at,s=e+1;break;case ut:if('"'===t.charAt(e))i=ht;break;case ht:switch(t.charAt(e)){case this.delimiter:r.push(t.substring(s,e-1)),i=at,s=e+1;break;case'"':i=ut;break;default:i=lt}break;case lt:if('"'===t.charAt(e))i=ut}if(i===ht?r.push(t.substring(s,n-1)):r.push(t.substring(s)),e&&r.length!==this.fullColumnNames.length)throw new Error(`Invalid row in csv file. Should have ${this.fullColumnNames.length} elements in a row, but got ${r}`);return r}}class ft extends j{constructor(t){super(),this.microphoneConfig=t,this.isClosed=!1,this.fftSize=t.fftSize||1024;const e=Math.log2(this.fftSize);if(this.fftSize<0||e<4||e>14||!Number.isInteger(e))throw new Error(`Invalid fftSize: it must be a power of 2 between 2 to 4 and 2 to 14, but got ${this.fftSize}`);if(this.numFrames=t.numFramesPerSpectrogram||43,this.sampleRateHz=t.sampleRateHz,this.columnTruncateLength=t.columnTruncateLength||this.fftSize,this.audioTrackConstraints=t.audioTrackConstraints,this.smoothingTimeConstant=t.smoothingTimeConstant||0,this.includeSpectrogram=!1!==t.includeSpectrogram,this.includeWaveform=!0===t.includeWaveform,!this.includeSpectrogram&&!this.includeWaveform)throw new Error("Both includeSpectrogram and includeWaveform are false. At least one type of data should be returned.")}summary(){return"microphone"}static async create(t={}){if(!r().get("IS_BROWSER"))throw new Error("microphone API is only supported in browser environment.");const e=new ft(t);return await e.start(),e}async start(){try{this.stream=await navigator.mediaDevices.getUserMedia({audio:null==this.audioTrackConstraints||this.audioTrackConstraints,video:!1})}catch(t){throw new Error(`Error thrown while initializing video stream: ${t.message}`)}if(!this.stream)throw new Error("Could not obtain audio from microphone.");const t=window.AudioContext||window.webkitAudioContext;if(this.audioContext=new t,this.sampleRateHz){if(this.audioContext.sampleRate!==this.sampleRateHz)throw new Error(`Mismatch in sampling rate: Expected: ${this.sampleRateHz}; Actual: ${this.audioContext.sampleRate}`)}else this.sampleRateHz=this.audioContext.sampleRate;const e=this.audioContext.createMediaStreamSource(this.stream);this.analyser=this.audioContext.createAnalyser(),this.analyser.fftSize=2*this.fftSize,this.analyser.smoothingTimeConstant=this.smoothingTimeConstant,e.connect(this.analyser),this.freqData=new Float32Array(this.fftSize),this.timeData=new Float32Array(this.fftSize)}async next(){if(this.isClosed)return{value:null,done:!0};let t,e;const r=await this.getAudioData();if(this.includeSpectrogram){const e=this.flattenQueue(r.freqDataQueue);t=this.getTensorFromAudioDataArray(e,[this.numFrames,this.columnTruncateLength,1])}if(this.includeWaveform){const t=this.flattenQueue(r.timeDataQueue);e=this.getTensorFromAudioDataArray(t,[this.numFrames*this.fftSize,1])}return{value:{spectrogram:t,waveform:e},done:!1}}async capture(){return(await this.next()).value}async getAudioData(){const t=[],e=[];let r=0;return new Promise((s=>{const n=setInterval((()=>{this.includeSpectrogram&&(this.analyser.getFloatFrequencyData(this.freqData),this.freqData[0]===-1/0&&s({freqDataQueue:t,timeDataQueue:e}),t.push(this.freqData.slice(0,this.columnTruncateLength))),this.includeWaveform&&(this.analyser.getFloatTimeDomainData(this.timeData),e.push(this.timeData.slice())),++r===this.numFrames&&(clearInterval(n),s({freqDataQueue:t,timeDataQueue:e}))}),this.fftSize/this.sampleRateHz*1e3)}))}stop(){this.isClosed||(this.isClosed=!0,this.analyser.disconnect(),this.audioContext.close(),null!=this.stream&&this.stream.getTracks().length>0&&this.stream.getTracks()[0].stop())}toArray(){throw new Error("Can not convert infinite audio stream to array.")}getSampleRate(){return this.sampleRateHz}flattenQueue(t){const e=t[0].length,r=new Float32Array(t.length*e);return t.forEach(((t,s)=>r.set(t,s*e))),r}getTensorFromAudioDataArray(t,r){const n=new Float32Array(e.sizeFromShape(r));return n.set(t,n.length-t.length),s(n,r)}}class mt extends j{constructor(t,e){if(super(),this.webcamVideoElement=t,this.webcamConfig=e,this.isClosed=!0,this.resize=!1,this.needToResize())if(this.resize=!0,this.cropSize=[this.webcamConfig.resizeHeight,this.webcamConfig.resizeWidth],this.cropBoxInd=n([0],"int32"),this.webcamConfig.centerCrop){const t=1*this.webcamConfig.resizeWidth/this.webcamVideoElement.width,e=1*this.webcamConfig.resizeHeight/this.webcamVideoElement.height,r=(1-t)/2,s=(1-e)/2,n=r+t,a=e+s;this.cropBox=i([s,r,a,n],[1,4])}else this.cropBox=i([0,0,1,1],[1,4])}summary(){return"webcam"}static async create(t,e={}){if(!r().get("IS_BROWSER"))throw new Error("tf.data.webcam is only supported in browser environment.");if(!t){if(t=document.createElement("video"),!e.resizeWidth||!e.resizeHeight)throw new Error("Please provide webcam video element, or resizeWidth and resizeHeight to create a hidden video element.");t.width=e.resizeWidth,t.height=e.resizeHeight}const s=new mt(t,e);return await s.start(),s}async start(){this.webcamConfig.facingMode&&e.assert("user"===this.webcamConfig.facingMode||"environment"===this.webcamConfig.facingMode,(()=>`Invalid webcam facing mode: ${this.webcamConfig.facingMode}. Please provide 'user' or 'environment'`));try{this.stream=await navigator.mediaDevices.getUserMedia({video:{deviceId:this.webcamConfig.deviceId,facingMode:this.webcamConfig.facingMode?this.webcamConfig.facingMode:"user",width:this.webcamVideoElement.width,height:this.webcamVideoElement.height}})}catch(t){throw t.message=`Error thrown while initializing video stream: ${t.message}`,t}if(!this.stream)throw new Error("Could not obtain video from webcam.");try{this.webcamVideoElement.srcObject=this.stream}catch(t){console.log(t),this.webcamVideoElement.src=window.URL.createObjectURL(this.stream)}return this.webcamVideoElement.play(),this.isClosed=!1,new Promise((t=>{this.webcamVideoElement.onloadedmetadata=()=>{t()}}))}async next(){if(this.isClosed)return{value:null,done:!0};let t;try{t=a.fromPixels(this.webcamVideoElement)}catch(t){throw new Error(`Error thrown converting video to pixels: ${JSON.stringify(t)}`)}if(!this.resize)return{value:t,done:!1};try{return{value:this.cropAndResizeFrame(t),done:!1}}catch(t){throw new Error(`Error thrown cropping the video: ${t.message}`)}finally{t.dispose()}}needToResize(){return!(!this.webcamConfig.resizeWidth||!this.webcamConfig.resizeHeight||this.webcamVideoElement.width===this.webcamConfig.resizeWidth&&this.webcamVideoElement.height===this.webcamConfig.resizeHeight)}cropAndResizeFrame(t){return o((()=>{const e=u(h(t,"float32"),0);let r;r=l.cropAndResize(e,this.cropBox,this.cropBoxInd,this.cropSize,"bilinear");const s=r.shape;return c(r,s.slice(1))}))}async capture(){return(await this.next()).value}stop(){this.stream.getTracks().forEach((t=>t.stop()));try{this.webcamVideoElement.srcObject=null}catch(t){console.log(t),this.webcamVideoElement.src=null}this.isClosed=!0}toArray(){throw new Error("Can not convert infinite video stream to array.")}}class dt{}class pt extends j{split(t){return new wt(this,t)}}class wt extends 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iterator(){return zt(this.url)?new Et(this.url,this.fileOptions).iterator():async function(t,r={},s){let n,i;"string"==typeof t?n=t:(n=t.url,i=Ct(t));const a=await(s||e.fetch)(n,i);if(a.ok){const t=new Uint8Array(await a.arrayBuffer());return new bt(t,r)}throw new Error(a.statusText)}(this.url,this.fileOptions)}}function At(t,e={}){return new ct(new St(t),e)}function Rt(t){const e=M(t);return et((async()=>e))}function Tt(t){return et((async()=>{const e=await t();return M((()=>e.next()))}))}async function kt(t,e){return mt.create(t,e)}async function Ft(t){return ft.create(t)}const Nt="4.3.0";export{ct as CSVDataset,tt as Dataset,Et as FileDataSource,it as TextLineDataset,St as URLDataSource,rt as array,At as csv,Rt as func,Tt as generator,Ft as microphone,Nt as version_data,kt as webcam,st as zip};
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dist/tf-data.min.js

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t(e)}))}))]}}))}))}),this.size===1/0?1/0:null)},t.prototype.forEachAsync=function(t){return u(this,void 0,void 0,(function(){return s(this,(function(e){switch(e.label){case 0:return[4,this.iterator()];case 1:return[2,e.sent().forEachAsync(t)]}}))}))},t.prototype.map=function(t){var e=this,n=this;return tt((function(){return u(e,void 0,void 0,(function(){return s(this,(function(e){switch(e.label){case 0:return[4,n.iterator()];case 1:return[2,e.sent().map((function(e){return r.tidy((function(){return t(e)}))}))]}}))}))}),this.size)},t.prototype.mapAsync=function(t){var e=this,n=this;return tt((function(){return u(e,void 0,void 0,(function(){return s(this,(function(e){switch(e.label){case 0:return[4,n.iterator()];case 1:return[2,e.sent().mapAsync(t)]}}))}))}),this.size)},t.prototype.prefetch=function(t){var e=this;if(null==t)throw new RangeError("`Dataset.prefetch()` requires bufferSize to be specified.");var n=this;return tt((function(){return u(e,void 0,void 0,(function(){return s(this,(function(e){switch(e.label){case 0:return[4,n.iterator()];case 1:return[2,e.sent().prefetch(t)]}}))}))}),this.size)},t.prototype.repeat=function(t){var e=this,n=this;return tt((function(){return u(e,void 0,void 0,(function(){var e,r=this;return s(this,(function(i){return e=D((function(){return u(r,void 0,void 0,(function(){var t;return s(this,(function(e){switch(e.label){case 0:return t={},[4,n.iterator()];case 1:return[2,(t.value=e.sent(),t.done=!1,t)]}}))}))})),[2,(o=e.take(t),new Z(o,a))];var o,a}))}))}),null!=this.size&&t>0?this.size*t:0===t?0:null!=this.size&&(void 0===t||t<0)?1/0:null)},t.prototype.skip=function(t){var e=this,n=this;return tt((function(){return u(e,void 0,void 0,(function(){return s(this,(function(e){switch(e.label){case 0:return[4,n.iterator()];case 1:return[2,e.sent().skip(t)]}}))}))}),null!=this.size&&t>=0&&this.size>=t?this.size-t:null!=this.size&&(this.size<t||void 0===t||t<0)?0:null)},t.prototype.shuffle=function(t,e,n){var i=this;if(void 0===n&&(n=!0),null==t||t<0)throw null==this.size?new RangeError("`Dataset.shuffle()` requires bufferSize to be specified."):new RangeError("`Dataset.shuffle()` requires bufferSize to be specified.  If your data fits in main memory (for regular JS objects), and/or GPU memory (for `tf.Tensor`s), consider setting "+"bufferSize to the dataset size (".concat(this.size," elements)"));var o=this,a=C.alea(e||r.util.now().toString());return tt((function(){return u(i,void 0,void 0,(function(){var e;return s(this,(function(r){switch(r.label){case 0:return e=a.int32(),n&&(e+=a.int32()),[4,o.iterator()];case 1:return[2,r.sent().shuffle(t,e.toString())]}}))}))}),this.size)},t.prototype.take=function(t){var e=this,n=this;return tt((function(){return u(e,void 0,void 0,(function(){return s(this,(function(e){switch(e.label){case 0:return[4,n.iterator()];case 1:return[2,e.sent().take(t)]}}))}))}),null!=this.size&&this.size>t?t:null!=this.size&&this.size<=t?this.size:null)},t.prototype.toArray=function(){return u(this,void 0,void 0,(function(){return s(this,(function(t){switch(t.label){case 0:if(this.size===1/0)throw new Error("Can not convert infinite data stream to 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r.Tensor?r.stack(t):r.tensor(t)}(t),recurse:!1}:{value:null,recurse:!0}}$.MAX_BUFFER_SIZE=1e4;var nt=function(t){function e(e){var n=t.call(this)||this;return n.input=e,n}return o(e,t),e.prototype.iterator=function(){return u(this,void 0,void 0,(function(){var t,e;return s(this,(function(n){switch(n.label){case 0:return[4,this.input.iterator()];case 1:return t=n.sent(),e=t.decodeUTF8(),[2,e.split("\n").map((function(t){return t.endsWith("\r")&&(t=t.slice(0,-1)),t}))]}}))}))},e}($),rt='"',it=Symbol("out"),ot=Symbol("field"),ut=Symbol("quote"),st=Symbol("quoteafterquote"),at=Symbol("quoteinquote"),ct=function(t){function n(n,r){var i=t.call(this)||this;return i.input=n,i.hasHeader=!0,i.fullColumnNames=null,i.columnNamesValidated=!1,i.columnConfigs=null,i.configuredColumnsOnly=!1,i.delimiter=",",i.delimWhitespace=!1,i.base=new nt(n),r||(r={}),i.hasHeader=!1!==r.hasHeader,i.fullColumnNames=r.columnNames,i.columnConfigs=r.columnConfigs,i.configuredColumnsOnly=r.configuredColumnsOnly,r.delimWhitespace?(e.util.assert(null==r.delimiter,(function(){return"Delimiter should not be provided when delimWhitespace is true."})),i.delimWhitespace=!0,i.delimiter=" "):i.delimiter=r.delimiter?r.delimiter:",",i}return o(n,t),n.prototype.columnNames=function(){return u(this,void 0,void 0,(function(){return s(this,(function(t){switch(t.label){case 0:return this.columnNamesValidated?[3,2]:[4,this.setColumnNames()];case 1:t.sent(),t.label=2;case 2:return[2,this.configuredColumnsOnly?Object.keys(this.columnConfigs):this.fullColumnNames]}}))}))},n.prototype.setColumnNames=function(){return u(this,void 0,void 0,(function(){var t,n,r,i,o,u,c,l,f=this;return s(this,(function(s){switch(s.label){case 0:return[4,this.maybeReadHeaderLine()];case 1:if(t=s.sent(),!this.fullColumnNames&&!t)throw new Error("Column names must be provided if there is no header line.");if(this.fullColumnNames&&t&&e.util.assert(t.length===this.fullColumnNames.length,(function(){return"The length of provided columnNames ("+f.fullColumnNames.length.toString()+") does not match the length of the header line read from file ("+t.length.toString()+")."})),this.fullColumnNames||(this.fullColumnNames=t),n=this.fullColumnNames.reduce((function(t,e){return t[e]=t[e]+1||1,t}),{}),r=Object.keys(n).filter((function(t){return n[t]>1})),e.util.assert(0===r.length,(function(){return"Duplicate column names found: "+r.toString()})),this.columnConfigs)try{for(i=a(Object.keys(this.columnConfigs)),o=i.next();!o.done;o=i.next())if(u=o.value,-1===this.fullColumnNames.indexOf(u))throw new Error('The key "'+u+'" provided in columnConfigs does not match any of the column names ('+this.fullColumnNames.toString()+").")}catch(t){c={error:t}}finally{try{o&&!o.done&&(l=i.return)&&l.call(i)}finally{if(c)throw c.error}}return this.columnNamesValidated=!0,[2]}}))}))},n.prototype.maybeReadHeaderLine=function(){return u(this,void 0,void 0,(function(){var t,e;return s(this,(function(n){switch(n.label){case 0:return this.hasHeader?[4,this.base.iterator()]:[3,3];case 1:return[4,n.sent().next()];case 2:if((t=n.sent()).done)throw new Error("No data was found for CSV parsing.");return e=t.value,[2,this.parseRow(e,!1)];case 3:return[2,null]}}))}))},n.prototype.iterator=function(){return u(this,void 0,void 0,(function(){var t,e=this;return s(this,(function(n){switch(n.label){case 0:return this.columnNamesValidated?[3,2]:[4,this.setColumnNames()];case 1:n.sent(),n.label=2;case 2:return[4,this.base.iterator()];case 3:return t=n.sent(),this.hasHeader&&(t=t.skip(1)),[2,t.map((function(t){return e.makeDataElement(t)}))]}}))}))},n.prototype.makeDataElement=function(t){for(var e=this.parseRow(t),n={},r={},i=0;i<this.fullColumnNames.length;i++){var o=this.fullColumnNames[i],u=this.columnConfigs?this.columnConfigs[o]:null;if(!this.configuredColumnsOnly||u){var s=e[i],a=null;if(""===s)if(u&&void 0!==u.default)a=u.default;else{if(u&&(u.required||u.isLabel))throw new Error("Required column ".concat(o," is empty in this line: ").concat(t));a=void 0}else{var c=Number(s);if(isNaN(c))a=u&&"bool"===u.dtype?this.getBoolean(s):s;else if(u&&u.dtype)switch(u.dtype){case"float32":default:a=c;break;case"int32":a=Math.floor(c);break;case"bool":a=this.getBoolean(s)}else a=c}u&&u.isLabel?r[o]=a:n[o]=a}}return 0===Object.keys(r).length?n:{xs:n,ys:r}},n.prototype.getBoolean=function(t){return"1"===t||"true"===t.toLowerCase()?1:0},n.prototype.parseRow=function(t,e){void 0===e&&(e=!0);for(var n=[],r=0,i=t.length,o=it,u=0;u<i;u++)switch(o){case it:switch(t.charAt(u)){case rt:r=u+1,o=ut;break;case this.delimiter:if(r=u+1," "===this.delimiter&&this.delimWhitespace)break;n.push(""),o=it;break;default:o=ot,r=u}break;case ot:if(t.charAt(u)===this.delimiter)n.push(t.substring(r,u)),o=it,r=u+1;break;case ut:if(t.charAt(u)===rt)o=st;break;case st:switch(t.charAt(u)){case this.delimiter:n.push(t.substring(r,u-1)),o=it,r=u+1;break;case rt:o=ut;break;default:o=at}break;case at:if(t.charAt(u)===rt)o=ut}if(o===st?n.push(t.substring(r,i-1)):n.push(t.substring(r)),e&&n.length!==this.fullColumnNames.length)throw new Error("Invalid row in csv file. Should have ".concat(this.fullColumnNames.length," elements in a row, but got ").concat(n));return n},n}($),lt=function(t){function n(e){var n=t.call(this)||this;n.microphoneConfig=e,n.isClosed=!1,n.fftSize=e.fftSize||1024;var r=Math.log2(n.fftSize);if(n.fftSize<0||r<4||r>14||!Number.isInteger(r))throw new Error("Invalid fftSize: it must be a power of 2 between "+"2 to 4 and 2 to 14, but got ".concat(n.fftSize));if(n.numFrames=e.numFramesPerSpectrogram||43,n.sampleRateHz=e.sampleRateHz,n.columnTruncateLength=e.columnTruncateLength||n.fftSize,n.audioTrackConstraints=e.audioTrackConstraints,n.smoothingTimeConstant=e.smoothingTimeConstant||0,n.includeSpectrogram=!1!==e.includeSpectrogram,n.includeWaveform=!0===e.includeWaveform,!n.includeSpectrogram&&!n.includeWaveform)throw new Error("Both includeSpectrogram and includeWaveform are false. At least one type of data should be returned.");return n}return o(n,t),n.prototype.summary=function(){return"microphone"},n.create=function(t){return void 0===t&&(t={}),u(this,void 0,void 0,(function(){var r;return s(this,(function(i){switch(i.label){case 0:if(!e.env().get("IS_BROWSER"))throw new Error("microphone API is only supported in browser environment.");return[4,(r=new n(t)).start()];case 1:return i.sent(),[2,r]}}))}))},n.prototype.start=function(){return u(this,void 0,void 0,(function(){var t,e,n,r;return s(this,(function(i){switch(i.label){case 0:return i.trys.push([0,2,,3]),t=this,[4,navigator.mediaDevices.getUserMedia({audio:null==this.audioTrackConstraints||this.audioTrackConstraints,video:!1})];case 1:return t.stream=i.sent(),[3,3];case 2:throw e=i.sent(),new Error("Error thrown while initializing video stream: ".concat(e.message));case 3:if(!this.stream)throw new Error("Could not obtain audio from microphone.");if(n=window.AudioContext||window.webkitAudioContext,this.audioContext=new n,this.sampleRateHz){if(this.audioContext.sampleRate!==this.sampleRateHz)throw new Error("Mismatch in sampling rate: "+"Expected: ".concat(this.sampleRateHz,"; ")+"Actual: ".concat(this.audioContext.sampleRate))}else this.sampleRateHz=this.audioContext.sampleRate;return r=this.audioContext.createMediaStreamSource(this.stream),this.analyser=this.audioContext.createAnalyser(),this.analyser.fftSize=2*this.fftSize,this.analyser.smoothingTimeConstant=this.smoothingTimeConstant,r.connect(this.analyser),this.freqData=new Float32Array(this.fftSize),this.timeData=new Float32Array(this.fftSize),[2]}}))}))},n.prototype.next=function(){return u(this,void 0,void 0,(function(){var t,e,n,r,i;return s(this,(function(o){switch(o.label){case 0:return this.isClosed?[2,{value:null,done:!0}]:[4,this.getAudioData()];case 1:return n=o.sent(),this.includeSpectrogram&&(r=this.flattenQueue(n.freqDataQueue),t=this.getTensorFromAudioDataArray(r,[this.numFrames,this.columnTruncateLength,1])),this.includeWaveform&&(i=this.flattenQueue(n.timeDataQueue),e=this.getTensorFromAudioDataArray(i,[this.numFrames*this.fftSize,1])),[2,{value:{spectrogram:t,waveform:e},done:!1}]}}))}))},n.prototype.capture=function(){return u(this,void 0,void 0,(function(){return s(this,(function(t){switch(t.label){case 0:return[4,this.next()];case 1:return[2,t.sent().value]}}))}))},n.prototype.getAudioData=function(){return u(this,void 0,void 0,(function(){var t,e,n,r=this;return s(this,(function(i){return t=[],e=[],n=0,[2,new Promise((function(i){var o=setInterval((function(){r.includeSpectrogram&&(r.analyser.getFloatFrequencyData(r.freqData),r.freqData[0]===-1/0&&i({freqDataQueue:t,timeDataQueue:e}),t.push(r.freqData.slice(0,r.columnTruncateLength))),r.includeWaveform&&(r.analyser.getFloatTimeDomainData(r.timeData),e.push(r.timeData.slice())),++n===r.numFrames&&(clearInterval(o),i({freqDataQueue:t,timeDataQueue:e}))}),r.fftSize/r.sampleRateHz*1e3)}))]}))}))},n.prototype.stop=function(){this.isClosed||(this.isClosed=!0,this.analyser.disconnect(),this.audioContext.close(),null!=this.stream&&this.stream.getTracks().length>0&&this.stream.getTracks()[0].stop())},n.prototype.toArray=function(){throw new Error("Can not convert infinite audio stream to array.")},n.prototype.getSampleRate=function(){return this.sampleRateHz},n.prototype.flattenQueue=function(t){var e=t[0].length,n=new Float32Array(t.length*e);return t.forEach((function(t,r){return n.set(t,r*e)})),n},n.prototype.getTensorFromAudioDataArray=function(t,n){var r=new Float32Array(e.util.sizeFromShape(n));return r.set(t,r.length-t.length),e.tensor(r,n)},n}(j),ft=function(t){function n(n,r){var i=t.call(this)||this;if(i.webcamVideoElement=n,i.webcamConfig=r,i.isClosed=!0,i.resize=!1,i.needToResize())if(i.resize=!0,i.cropSize=[i.webcamConfig.resizeHeight,i.webcamConfig.resizeWidth],i.cropBoxInd=e.tensor1d([0],"int32"),i.webcamConfig.centerCrop){var o=1*i.webcamConfig.resizeWidth/i.webcamVideoElement.width,u=1*i.webcamConfig.resizeHeight/i.webcamVideoElement.height,s=(1-o)/2,a=(1-u)/2,c=s+o,l=u+a;i.cropBox=e.tensor2d([a,s,l,c],[1,4])}else i.cropBox=e.tensor2d([0,0,1,1],[1,4]);return i}return o(n,t),n.prototype.summary=function(){return"webcam"},n.create=function(t,r){return void 0===r&&(r={}),u(this,void 0,void 0,(function(){var i;return s(this,(function(o){switch(o.label){case 0:if(!e.env().get("IS_BROWSER"))throw new Error("tf.data.webcam is only supported in browser environment.");if(!t){if(t=document.createElement("video"),!r.resizeWidth||!r.resizeHeight)throw new Error("Please provide webcam video element, or resizeWidth and resizeHeight to create a hidden video element.");t.width=r.resizeWidth,t.height=r.resizeHeight}return[4,(i=new n(t,r)).start()];case 1:return o.sent(),[2,i]}}))}))},n.prototype.start=function(){return u(this,void 0,void 0,(function(){var t,n,r=this;return s(this,(function(i){switch(i.label){case 0:this.webcamConfig.facingMode&&e.util.assert("user"===this.webcamConfig.facingMode||"environment"===this.webcamConfig.facingMode,(function(){return"Invalid webcam facing mode: ".concat(r.webcamConfig.facingMode,". ")+"Please provide 'user' or 'environment'"})),i.label=1;case 1:return i.trys.push([1,3,,4]),t=this,[4,navigator.mediaDevices.getUserMedia({video:{deviceId:this.webcamConfig.deviceId,facingMode:this.webcamConfig.facingMode?this.webcamConfig.facingMode:"user",width:this.webcamVideoElement.width,height:this.webcamVideoElement.height}})];case 2:return t.stream=i.sent(),[3,4];case 3:throw(n=i.sent()).message="Error thrown while initializing video stream: ".concat(n.message),n;case 4:if(!this.stream)throw new Error("Could not obtain video from webcam.");try{this.webcamVideoElement.srcObject=this.stream}catch(t){console.log(t),this.webcamVideoElement.src=window.URL.createObjectURL(this.stream)}return this.webcamVideoElement.play(),this.isClosed=!1,[2,new Promise((function(t){r.webcamVideoElement.onloadedmetadata=function(){t()}}))]}}))}))},n.prototype.next=function(){return u(this,void 0,void 0,(function(){var t;return 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o(e,t),e.prototype.next=function(){return u(this,void 0,void 0,(function(){var t=this;return s(this,(function(e){return this.lastRead=this.lastRead.then((function(){return t.serialNext()})),[2,this.lastRead]}))}))},e.prototype.randomInt=function(t){return Math.floor(this.random()*t)},e.prototype.chooseIndex=function(){return this.randomInt(this.buffer.length())},e.prototype.serialNext=function(){return u(this,void 0,void 0,(function(){var t,e;return s(this,(function(n){switch(n.label){case 0:this.upstreamExhausted||this.refill(),n.label=1;case 1:return this.buffer.isEmpty()?[3,3]:(t=this.chooseIndex(),[4,this.buffer.shuffleExcise(t)]);case 2:return(e=n.sent()).done?(this.upstreamExhausted=!0,[3,1]):(this.refill(),[2,e]);case 3:return[2,{value:null,done:!0}]}}))}))},e}(Y),$=function(){function t(){this.size=null}return t.prototype.batch=function(t,e){var n=this;void 0===e&&(e=!0);var i=this;return r.util.assert(t>0,(function(){return"batchSize needs to be positive, but it is\n      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o=this.fullColumnNames[i],u=this.columnConfigs?this.columnConfigs[o]:null;if(!this.configuredColumnsOnly||u){var s=e[i],a=null;if(""===s)if(u&&void 0!==u.default)a=u.default;else{if(u&&(u.required||u.isLabel))throw new Error("Required column ".concat(o," is empty in this line: ").concat(t));a=void 0}else{var c=Number(s);if(isNaN(c))a=u&&"bool"===u.dtype?this.getBoolean(s):s;else if(u&&u.dtype)switch(u.dtype){case"float32":default:a=c;break;case"int32":a=Math.floor(c);break;case"bool":a=this.getBoolean(s)}else a=c}u&&u.isLabel?r[o]=a:n[o]=a}}return 0===Object.keys(r).length?n:{xs:n,ys:r}},n.prototype.getBoolean=function(t){return"1"===t||"true"===t.toLowerCase()?1:0},n.prototype.parseRow=function(t,e){void 0===e&&(e=!0);for(var n=[],r=0,i=t.length,o=it,u=0;u<i;u++)switch(o){case it:switch(t.charAt(u)){case rt:r=u+1,o=ut;break;case this.delimiter:if(r=u+1," "===this.delimiter&&this.delimWhitespace)break;n.push(""),o=it;break;default:o=ot,r=u}break;case ot:if(t.charAt(u)===this.delimiter)n.push(t.substring(r,u)),o=it,r=u+1;break;case ut:if(t.charAt(u)===rt)o=st;break;case st:switch(t.charAt(u)){case this.delimiter:n.push(t.substring(r,u-1)),o=it,r=u+1;break;case rt:o=ut;break;default:o=at}break;case at:if(t.charAt(u)===rt)o=ut}if(o===st?n.push(t.substring(r,i-1)):n.push(t.substring(r)),e&&n.length!==this.fullColumnNames.length)throw new Error("Invalid row in csv file. Should have ".concat(this.fullColumnNames.length," elements in a row, but got ").concat(n));return n},n}($),lt=function(t){function n(e){var n=t.call(this)||this;n.microphoneConfig=e,n.isClosed=!1,n.fftSize=e.fftSize||1024;var r=Math.log2(n.fftSize);if(n.fftSize<0||r<4||r>14||!Number.isInteger(r))throw new Error("Invalid fftSize: it must be a power of 2 between "+"2 to 4 and 2 to 14, but got ".concat(n.fftSize));if(n.numFrames=e.numFramesPerSpectrogram||43,n.sampleRateHz=e.sampleRateHz,n.columnTruncateLength=e.columnTruncateLength||n.fftSize,n.audioTrackConstraints=e.audioTrackConstraints,n.smoothingTimeConstant=e.smoothingTimeConstant||0,n.includeSpectrogram=!1!==e.includeSpectrogram,n.includeWaveform=!0===e.includeWaveform,!n.includeSpectrogram&&!n.includeWaveform)throw new Error("Both includeSpectrogram and includeWaveform are false. At least one type of data should be returned.");return n}return o(n,t),n.prototype.summary=function(){return"microphone"},n.create=function(t){return void 0===t&&(t={}),u(this,void 0,void 0,(function(){var r;return s(this,(function(i){switch(i.label){case 0:if(!e.env().get("IS_BROWSER"))throw new Error("microphone API is only supported in browser environment.");return[4,(r=new n(t)).start()];case 1:return i.sent(),[2,r]}}))}))},n.prototype.start=function(){return u(this,void 0,void 0,(function(){var t,e,n,r;return s(this,(function(i){switch(i.label){case 0:return i.trys.push([0,2,,3]),t=this,[4,navigator.mediaDevices.getUserMedia({audio:null==this.audioTrackConstraints||this.audioTrackConstraints,video:!1})];case 1:return t.stream=i.sent(),[3,3];case 2:throw e=i.sent(),new Error("Error thrown while initializing video stream: ".concat(e.message));case 3:if(!this.stream)throw new Error("Could not obtain audio from microphone.");if(n=window.AudioContext||window.webkitAudioContext,this.audioContext=new n,this.sampleRateHz){if(this.audioContext.sampleRate!==this.sampleRateHz)throw new Error("Mismatch in sampling rate: "+"Expected: ".concat(this.sampleRateHz,"; ")+"Actual: ".concat(this.audioContext.sampleRate))}else this.sampleRateHz=this.audioContext.sampleRate;return r=this.audioContext.createMediaStreamSource(this.stream),this.analyser=this.audioContext.createAnalyser(),this.analyser.fftSize=2*this.fftSize,this.analyser.smoothingTimeConstant=this.smoothingTimeConstant,r.connect(this.analyser),this.freqData=new Float32Array(this.fftSize),this.timeData=new Float32Array(this.fftSize),[2]}}))}))},n.prototype.next=function(){return u(this,void 0,void 0,(function(){var t,e,n,r,i;return s(this,(function(o){switch(o.label){case 0:return this.isClosed?[2,{value:null,done:!0}]:[4,this.getAudioData()];case 1:return n=o.sent(),this.includeSpectrogram&&(r=this.flattenQueue(n.freqDataQueue),t=this.getTensorFromAudioDataArray(r,[this.numFrames,this.columnTruncateLength,1])),this.includeWaveform&&(i=this.flattenQueue(n.timeDataQueue),e=this.getTensorFromAudioDataArray(i,[this.numFrames*this.fftSize,1])),[2,{value:{spectrogram:t,waveform:e},done:!1}]}}))}))},n.prototype.capture=function(){return u(this,void 0,void 0,(function(){return s(this,(function(t){switch(t.label){case 0:return[4,this.next()];case 1:return[2,t.sent().value]}}))}))},n.prototype.getAudioData=function(){return u(this,void 0,void 0,(function(){var t,e,n,r=this;return s(this,(function(i){return t=[],e=[],n=0,[2,new Promise((function(i){var o=setInterval((function(){r.includeSpectrogram&&(r.analyser.getFloatFrequencyData(r.freqData),r.freqData[0]===-1/0&&i({freqDataQueue:t,timeDataQueue:e}),t.push(r.freqData.slice(0,r.columnTruncateLength))),r.includeWaveform&&(r.analyser.getFloatTimeDomainData(r.timeData),e.push(r.timeData.slice())),++n===r.numFrames&&(clearInterval(o),i({freqDataQueue:t,timeDataQueue:e}))}),r.fftSize/r.sampleRateHz*1e3)}))]}))}))},n.prototype.stop=function(){this.isClosed||(this.isClosed=!0,this.analyser.disconnect(),this.audioContext.close(),null!=this.stream&&this.stream.getTracks().length>0&&this.stream.getTracks()[0].stop())},n.prototype.toArray=function(){throw new Error("Can not convert infinite audio stream to array.")},n.prototype.getSampleRate=function(){return this.sampleRateHz},n.prototype.flattenQueue=function(t){var e=t[0].length,n=new Float32Array(t.length*e);return t.forEach((function(t,r){return n.set(t,r*e)})),n},n.prototype.getTensorFromAudioDataArray=function(t,n){var r=new Float32Array(e.util.sizeFromShape(n));return r.set(t,r.length-t.length),e.tensor(r,n)},n}(j),ft=function(t){function n(n,r){var i=t.call(this)||this;if(i.webcamVideoElement=n,i.webcamConfig=r,i.isClosed=!0,i.resize=!1,i.needToResize())if(i.resize=!0,i.cropSize=[i.webcamConfig.resizeHeight,i.webcamConfig.resizeWidth],i.cropBoxInd=e.tensor1d([0],"int32"),i.webcamConfig.centerCrop){var o=1*i.webcamConfig.resizeWidth/i.webcamVideoElement.width,u=1*i.webcamConfig.resizeHeight/i.webcamVideoElement.height,s=(1-o)/2,a=(1-u)/2,c=s+o,l=u+a;i.cropBox=e.tensor2d([a,s,l,c],[1,4])}else i.cropBox=e.tensor2d([0,0,1,1],[1,4]);return i}return o(n,t),n.prototype.summary=function(){return"webcam"},n.create=function(t,r){return void 0===r&&(r={}),u(this,void 0,void 0,(function(){var i;return s(this,(function(o){switch(o.label){case 0:if(!e.env().get("IS_BROWSER"))throw new Error("tf.data.webcam is only supported in browser environment.");if(!t){if(t=document.createElement("video"),!r.resizeWidth||!r.resizeHeight)throw new Error("Please provide webcam video element, or resizeWidth and resizeHeight to create a hidden video element.");t.width=r.resizeWidth,t.height=r.resizeHeight}return[4,(i=new n(t,r)).start()];case 1:return o.sent(),[2,i]}}))}))},n.prototype.start=function(){return u(this,void 0,void 0,(function(){var t,n,r=this;return s(this,(function(i){switch(i.label){case 0:this.webcamConfig.facingMode&&e.util.assert("user"===this.webcamConfig.facingMode||"environment"===this.webcamConfig.facingMode,(function(){return"Invalid webcam facing mode: ".concat(r.webcamConfig.facingMode,". ")+"Please provide 'user' or 'environment'"})),i.label=1;case 1:return i.trys.push([1,3,,4]),t=this,[4,navigator.mediaDevices.getUserMedia({video:{deviceId:this.webcamConfig.deviceId,facingMode:this.webcamConfig.facingMode?this.webcamConfig.facingMode:"user",width:this.webcamVideoElement.width,height:this.webcamVideoElement.height}})];case 2:return t.stream=i.sent(),[3,4];case 3:throw(n=i.sent()).message="Error thrown while initializing video stream: ".concat(n.message),n;case 4:if(!this.stream)throw new Error("Could not obtain video from webcam.");try{this.webcamVideoElement.srcObject=this.stream}catch(t){console.log(t),this.webcamVideoElement.src=window.URL.createObjectURL(this.stream)}return this.webcamVideoElement.play(),this.isClosed=!1,[2,new Promise((function(t){r.webcamVideoElement.onloadedmetadata=function(){t()}}))]}}))}))},n.prototype.next=function(){return u(this,void 0,void 0,(function(){var t;return s(this,(function(n){if(this.isClosed)return[2,{value:null,done:!0}];try{t=e.browser.fromPixels(this.webcamVideoElement)}catch(t){throw new Error("Error thrown converting video to pixels: ".concat(JSON.stringify(t)))}if(!this.resize)return[2,{value:t,done:!1}];try{return[2,{value:this.cropAndResizeFrame(t),done:!1}]}catch(t){throw new Error("Error thrown cropping the video: ".concat(t.message))}finally{t.dispose()}return[2]}))}))},n.prototype.needToResize=function(){return!(!this.webcamConfig.resizeWidth||!this.webcamConfig.resizeHeight||this.webcamVideoElement.width===this.webcamConfig.resizeWidth&&this.webcamVideoElement.height===this.webcamConfig.resizeHeight)},n.prototype.cropAndResizeFrame=function(t){var n=this;return e.tidy((function(){var r,i=e.expandDims(e.cast(t,"float32"),0),o=(r=e.image.cropAndResize(i,n.cropBox,n.cropBoxInd,n.cropSize,"bilinear")).shape;return e.reshape(r,o.slice(1))}))},n.prototype.capture=function(){return u(this,void 0,void 0,(function(){return s(this,(function(t){switch(t.label){case 0:return[4,this.next()];case 1:return[2,t.sent().value]}}))}))},n.prototype.stop=function(){this.stream.getTracks().forEach((function(t){return t.stop()}));try{this.webcamVideoElement.srcObject=null}catch(t){console.log(t),this.webcamVideoElement.src=null}this.isClosed=!0},n.prototype.toArray=function(){throw new Error("Can not convert infinite video stream to array.")},n}(j),ht=function(){},dt=function(t){function e(){return null!==t&&t.apply(this,arguments)||this}return o(e,t),e.prototype.split=function(t){return new pt(this,t)},e}(j),pt=function(t){function e(e,n){var r=t.call(this)||this;return r.upstream=e,r.impl=new vt(e,n),r}return o(e,t),e.prototype.summary=function(){return this.impl.summary()},e.prototype.next=function(){return u(this,void 0,void 0,(function(){return s(this,(function(t){return[2,this.impl.next()]}))}))},e}(dt),vt=function(t){function e(e,n){var r=t.call(this)||this;return r.upstream=e,r.separator=n,r.carryover="",r}return o(e,t),e.prototype.summary=function(){return"".concat(this.upstream.summary()," -> Split('").concat(this.separator,"')")},e.prototype.pump=function(){return u(this,void 0,void 0,(function(){var t,e,n,r,i,o,u;return s(this,(function(s){switch(s.label){case 0:return[4,this.upstream.next()];case 1:if((t=s.sent()).done)return""===this.carryover?[2,!1]:(this.outputQueue.push(this.carryover),this.carryover="",[2,!0]);(e=t.value.split(this.separator))[0]=this.carryover+e[0];try{for(n=a(e.slice(0,-1)),r=n.next();!r.done;r=n.next())i=r.value,this.outputQueue.push(i)}catch(t){o={error:t}}finally{try{r&&!r.done&&(u=n.return)&&u.call(n)}finally{if(o)throw o.error}}return this.carryover=e[e.length-1],[2,!0]}}))}))},e}(X),mt=function(t){function e(){return null!==t&&t.apply(this,arguments)||this}return o(e,t),e.prototype.decodeUTF8=function(){return new yt(this)},e}(j),yt=function(t){function e(e){var n=t.call(this)||this;return n.upstream=e,n.impl=new wt(e),n}return o(e,t),e.prototype.summary=function(){return this.impl.summary()},e.prototype.next=function(){return u(this,void 0,void 0,(function(){return s(this,(function(t){return[2,this.impl.next()]}))}))},e}(dt),wt=function(t){function n(n){var r=t.call(this)||this;if(r.upstream=n,e.env().get("IS_BROWSER"))r.decoder=new TextDecoder("utf-8");else{var i=require("string_decoder").StringDecoder;r.decoder=new i("utf8")}return r}return o(n,t),n.prototype.summary=function(){return"".concat(this.upstream.summary()," -> Utf8")},n.prototype.pump=function(){return u(this,void 0,void 0,(function(){var t,n,r;return s(this,(function(i){switch(i.label){case 0:return[4,this.upstream.next()];case 1:return(t=i.sent()).done?[2,!1]:(n=t.value,r=e.env().get("IS_BROWSER")?this.decoder.decode(n,{stream:!0}):this.decoder.write(Buffer.from(n.buffer)),this.outputQueue.push(r),[2,!0])}}))}))},n}(X),bt=function(t){function n(n,r){void 0===r&&(r={});var i=t.call(this)||this;return i.file=n,i.options=r,e.util.assert(n instanceof Uint8Array||!!e.env().get("IS_BROWSER")&&(n instanceof File||n instanceof Blob),(function(){return"FileChunkIterator only supports File, Blob and Uint8Array right now."})),i.offset=r.offset||0,i.chunkSize=r.chunkSize||1048576,i}return o(n,t),n.prototype.summary=function(){return"FileChunks ".concat(this.file)},n.prototype.next=function(){return u(this,void 0,void 0,(function(){var t,e,n=this;return s(this,(function(r){switch(r.label){case 0:return this.offset>=(this.file instanceof Uint8Array?this.file.byteLength:this.file.size)?[2,{value:null,done:!0}]:(t=new Promise((function(t,e){var r=n.offset+n.chunkSize;if(n.file instanceof Uint8Array)t(new Uint8Array(n.file.slice(n.offset,r)));else{var i=new FileReader;i.onload=function(n){var r=i.result;if(r instanceof ArrayBuffer&&(r=new Uint8Array(r)),!(r instanceof Uint8Array))return e(new TypeError("FileReader returned unknown type."));t(r)},i.onabort=function(t){return e(new Error("Aborted"))},i.onerror=function(t){return e(new Error(t.type))};var o=n.file.slice(n.offset,r);i.readAsArrayBuffer(o)}n.offset=r})),e={},[4,t]);case 1:return[2,(e.value=r.sent(),e.done=!1,e)]}}))}))},n}(mt);function gt(t,n,r){return void 0===n&&(n={}),u(this,void 0,void 0,(function(){var i,o,u,a,c;return s(this,(function(s){switch(s.label){case 0:return"string"==typeof t?i=t:(i=t.url,o=xt(t)),[4,(r||e.util.fetch)(i,o)];case 1:return(u=s.sent()).ok?(c=Uint8Array.bind,[4,u.arrayBuffer()]):[3,3];case 2:return a=new(c.apply(Uint8Array,[void 0,s.sent()])),[2,new bt(a,n)];case 3:throw new Error(u.statusText)}}))}))}var xt=function(t){return{method:t.method,headers:t.headers,body:t.body,mode:t.mode,credentials:t.credentials,cache:t.cache,redirect:t.redirect,referrer:t.referrer,integrity:t.integrity}};function Ct(t){return"string"==typeof t&&"file://"===t.slice(0,7)}var zt=function(t){function n(e,n){void 0===n&&(n={});var r=t.call(this)||this;return r.input=e,r.options=n,r}return o(n,t),n.prototype.iterator=function(){return u(this,void 0,void 0,(function(){var t;return s(this,(function(n){return Ct(this.input)&&e.env().get("IS_NODE")&&(t=require("fs"),this.input=t.readFileSync(this.input.slice(7))),[2,new bt(this.input,this.options)]}))}))},n}(ht),Et=function(t){function e(e,n){void 0===n&&(n={});var r=t.call(this)||this;return r.url=e,r.fileOptions=n,r}return o(e,t),e.prototype.iterator=function(){return u(this,void 0,void 0,(function(){return s(this,(function(t){return Ct(this.url)?[2,new zt(this.url,this.fileOptions).iterator()]:[2,gt(this.url,this.fileOptions)]}))}))},e}(ht);t.CSVDataset=ct,t.Dataset=$,t.FileDataSource=zt,t.TextLineDataset=nt,t.URLDataSource=Et,t.array=function(t){var e=this;return tt((function(){return u(e,void 0,void 0,(function(){return s(this,(function(e){return[2,N(t)]}))}))}),t.length)},t.csv=function(t,e){return void 0===e&&(e={}),new ct(new Et(t),e)},t.func=function(t){var e=this,n=D(t);return tt((function(){return u(e,void 0,void 0,(function(){return s(this,(function(t){return[2,n]}))}))}))},t.generator=function(t){var e=this;return tt((function(){return u(e,void 0,void 0,(function(){var e;return s(this,(function(n){switch(n.label){case 0:return[4,t()];case 1:return e=n.sent(),[2,D((function(){return e.next()}))]}}))}))}))},t.microphone=function(t){return u(this,void 0,void 0,(function(){return s(this,(function(e){return[2,lt.create(t)]}))}))},t.version_data="4.3.0",t.webcam=function(t,e){return u(this,void 0,void 0,(function(){return s(this,(function(n){return[2,ft.create(t,e)]}))}))},t.zip=function(t){var e,n=this;if(!T(t))throw new Error("The argument to zip() must be an object or array.");if(Array.isArray(t))for(var r=0;r<t.length;r++)e=null==e?t[r].size:Math.min(e,t[r].size);else if(t instanceof Object)for(var i in t)e=null==e?t[i].size:Math.min(e,t[i].size);return tt((function(){return u(n,void 0,void 0,(function(){var e;return s(this,(function(n){switch(n.label){case 0:return[4,R(t,(function(t){if(t instanceof $)return{value:t.iterator(),recurse:!1};if(T(t))return{value:null,recurse:!0};throw new Error("Leaves of the structure passed to zip() must be Datasets, not primitives.")}))];case 1:return e=n.sent(),[2,(r=e,i=I.SHORTEST,void 0===i&&(i=I.FAIL),new J(r,i))]}var r,i}))}))}),e)},Object.defineProperty(t,"__esModule",{value:!0})}));
 //# sourceMappingURL=tf-data.min.js.map

dist/types.d.ts

@@ -20,4 +20,4 @@ /**
 import { DataType, TensorContainer } from '@tensorflow/tfjs-core';
-export declare type Container<T> = ContainerObject<T> | ContainerArray<T>;
-export declare type ContainerOrT<T> = Container<T> | T;
+export type Container<T> = ContainerObject<T> | ContainerArray<T>;
+export type ContainerOrT<T> = Container<T> | T;
 export interface ContainerObject<T> {
@@ -31,3 +31,3 @@ [x: string]: ContainerOrT<T>;
  */
-export declare type FileElement = File | Blob | Uint8Array;
+export type FileElement = File | Blob | Uint8Array;
 /**
@@ -34,0 +34,0 @@ * A dictionary containing column level configurations when reading and decoding

dist/util/deep_map.d.ts

@@ -25,3 +25,3 @@ /**
  */
-export declare type DeepMapResult = {
+export type DeepMapResult = {
     value: any;
@@ -78,3 +78,3 @@ recurse: boolean;
  */
-export declare type DeepMapAsyncResult = {
+export type DeepMapAsyncResult = {
     value: Promise<any>;
@@ -81,0 +81,0 @@ recurse: boolean;

dist/version.d.ts

 /** @license See the LICENSE file. */
 /// <amd-module name="@tensorflow/tfjs-data/dist/version" />
-declare const version = "4.2.0";
+declare const version = "4.3.0";
 export { version };

dist/version.js

 /** @license See the LICENSE file. */
 // This code is auto-generated, do not modify this file!
-const version = '4.2.0';
+const version = '4.3.0';
 export { version };
-//# sourceMappingURL=data:application/json;base64,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
+//# sourceMappingURL=data:application/json;base64,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

package.json

 {
   "name": "@tensorflow/tfjs-data",
-  "version": "4.2.0",
+  "version": "4.3.0",
   "description": "TensorFlow Data API in JavaScript",
@@ -35,3 +35,3 @@ "private": false,
   "peerDependencies": {
-    "@tensorflow/tfjs-core": "4.2.0",
+    "@tensorflow/tfjs-core": "4.3.0",
     "seedrandom": "^3.0.5"
@@ -38,0 +38,0 @@ },

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The maintainer of the package marked it as deprecated. This could indicate that a single version should not be used, or that the package is no longer maintained and any new vulnerabilities will not be fixed.

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1

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