spello

A Fast and Accurate SpellCorrection using Sound and Edit-distance based Correction available in English and Hindi language.

What is it • Installation • Getting Started

What is it

Spello is a spellcorrection model built with combination of two models, Phoneme and Symspell Phoneme Model uses Soundex algo in background and suggests correct spellings using phonetic concepts to identify similar sounding words. On the other hand, Symspell Model uses concept of edit-distance in order to suggest correct spellings. Spello get's you best of both, taking into consideration context of the word as well.
Currently, this module is available for English(en) and Hindi(hi).

💾 Installation

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Install spello via `pip`

$ pip install spello

You can either train a new model from scratch or use pre-trained model. Alternatively you can also train model for your domain and use that on priority while use pre-trained model as a fallback

⚡ ️Getting Started

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1. Model Initialisation

Initialise the model for one of the suppored languages.

>>> from spello.model import SpellCorrectionModel  
>>> sp = SpellCorrectionModel(language='en')  

2. Model Training - New Model

You can choose to train model by providing data in one of the following format

• List of text or sentences.
• Dict having word and their corresponding count.

Training providing list of sentences

>>> sp.train(['I want to play cricket', 'this is a text corpus'])

Training providing words counter

>>> sp.train({'i': 2, 'want': 1, 'play': 1, 'cricket': 10, 'mumbai': 5})

List of text is a recommended type for training data as here model also tries to learn context in which words are appearing, which further help to find best possible suggestion in case more than one suggestions are suggested by symspell or phoneme model

3. Model Prediction

>>> sp.spell_correct('i wnt to plai kricket')  
{'original_text': 'i wnt to plai kricket',
 'spell_corrected_text': 'i want to play cricket',
 'correction_dict': {'wnt': 'want', 'plai': 'play', 'kricket': 'cricket'}
}

4. Save Model

Call the save method to save the trained model at given model dir

>>> sp.save(model_save_dir='/home/ubuntu/')
'/home/ubuntu/model.pkl' # saved model path

5. Load Model

Load the trained model from saved path, First initialise the model and call the load method

>>> from spello.model import SpellCorrectionModel
>>> sp = SpellCorrectionModel(language='en')
>>> sp.load('/home/ubuntu/model.pkl')

6. Customize Configuration of Model (Optional)

Here, you are also provided to customize various configuration of the model like

• Setting minumum and maximum length eligible for spellcorrection

>>> sp.config.min_length_for_spellcorrection = 4 # default is 3
>>> sp.config.max_length_for_spellcorrection = 12 # default is 15

• Setting Max edit distance allowed for each char level for symspell and phoneme model

>>> sp.config.symspell_allowed_distance_map = {2:0, 3: 1, 4: 2, 5: 3, 6: 3, 7: 4, 8: 4, 9:5, 10:5, 11:5, 12:5, 13: 6, 14: 6, 15: 6, 16: 6, 17: 6, 18: 6, 19: 6, 20: 6}
# above dict signifies max edit distance possible for word of length 6 is 3, for length 7 is 4 and so on..

To reset to default config

>>> sp.set_default_config()

there are many more configurations which you can set, check this file for more details

Get Started with Pre-trained Models

We have trained a basic model on 30K news + 30k wikipedia sentences
Follow below steps to get started with these model

• Download a pretrained model from below links

  language	model	size	md5 hash
  en	en.pkl.zip	84M	ec55760a7e25846bafe90b0c9ce9b09f
  en	en_large.pkl.zip	284M	9a4f5069b2395c9d5a1e8b9929e0c0a9
  hi	hi.pkl.zip	75M	ad8681161932fdbb8b1368bb16b9644a
  hi	hi_large.pkl.zip	341M	0cc73068f88a73612e7dd84434ad61e6

• Unzip the downloaded file

• Init and Load the model by specifying path of unzipped file

>>> from spello.model import SpellCorrectionModel
>>> sp = SpellCorrectionModel(language='en')
>>> sp.load('/path/to/file/en.pkl')

• Run the spell correction

>>> sp.spell_correct('i wnt to plei futbal')
{'original_text': 'i wnt to plei futbal',
 'spell_corrected_text': 'i want to play football',
 'correction_dict': {'wnt': 'want', 'plei': 'play', 'futbal': 'football'}
}

To train model for other languages, you can download data from here and follow training process.

Credits

This software uses the following open source packages:

• libindic
• symspell

Contribution guidelines

This project follows the all-contributors specification. Contributions of any kind welcome!

Please read the contribution guidelines first.

Future Scope / Limitations

One of the limitations of the current model is, it does not suggest corrections for any grammatical mistakes or for words in the vocabulary of the model. For example, in a sentence “I want to by Apple”, it will not suggest any correction for “by” as it is a valid English word but the correct replacement should be "buy".

In a future release, we will be adding features to suggest corrections for improper use word in a sentence.

Citing

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If you use spello in a scientific publication, we would appreciate references to the following BibTex entry:

@misc{haptik2020spello,
  title={spello},
  author={Srivastava Aman, Reddy SL Ruthvik },
  howpublished={\url{https://github.com/hellohaptik/spello}},
  year={2020}
}