GitHub - ai-forever/sage: SAGE: Spelling correction, corruption and evaluation for multiple languages

SAGE

Spelling correction, corruption and evaluation for multiple languages

Install | Models | Evaluation | SBSC | Augmentex | Papers

SAGE (Spell checking via Augmentation and Generative distribution Emulation) is a complete solution that you need when working on a spelling problem:

💯 Spelling correction with State-of-the-art pre-trained 🤗Transformer models:
- sage-fredt5-large
- sage-fredt5-distilled-95m
- sage-mt5-large
- sage-m2m100-1.2B
- T5-large
- M2M100-1.2B [Earlier release]
- M2M100-418M [Earlier release]
- FredT5-large [Earlier release]
You can test them out right here
🧩 Augment your data with spelling corruption algorithms, take a look at a quick demo
📊 Evaluate performance of spelling correction tools.

News

🔥 [2024-01-18]: Our paper "A Methodology for Generative Spelling Correction via Natural Spelling Errors Emulation across Multiple Domains and Languages" is accepted for EACL 2024 conference!

💥 [2024-04-11]: SAGE v1.1.0 is finally out: a comprehensive note about the details of release can be found here.

Installation

Regular install

git clone https://github.com/ai-forever/sage.git
cd sage
pip install .

To install extra requirements that you are going to need when working with ERRANT-based metric run

pip install -e ".[errant]"

or just

pip install -e .[errant]

Editable install

git clone https://github.com/ai-forever/sage.git
cd sage
pip install -e .

and proceed with extra requirements install as above.

Quick demo

Lets spoil some text:

import sage
from sage.spelling_corruption import SBSCConfig, SBSCCorruptor
from sage.utils import DatasetsAvailable

text = "Заметьте, не я это предложил!"

# Instantiate SBSC corruptor from a dataset with errors in medical anamnesis
config = SBSCConfig(
    reference_dataset_name_or_path=DatasetsAvailable.MedSpellchecker.name,
    reference_dataset_split="test"
)
corruptor = SBSCCorruptor.from_config(config)

corruptor.corrupt(text, seed=1)
# 'Заиетьте, не я эт о пред ложил!'

... now with Augmentex:

import sage
from sage.spelling_corruption import WordAugConfig, WordAugCorruptor

text = "Заметьте, не я это предложил!"

# Instantiate WordAugCorruptor corruptor with a custom set of parameters
config = WordAugConfig(
    min_aug=1,
    max_aug=5,
    unit_prob=0.4,
)
corruptor = WordAugCorruptor.from_config(config)

corruptor.corrupt(text, seed=1)
# 'это не предложил! Заметьте, я'

... or for the English language:

import os
from sage.spelling_corruption import SBSCConfig, SBSCCorruptor

text = "Screw you guys, I am going home. (c)"

# Instantiate SBSC corruptor from a JFLEG dataset
config = SBSCConfig(
    lang="en",
    reference_dataset_name_or_path=os.path.join("data", "example_data", "jfleg"),
)
corruptor = SBSCCorruptor.from_config(config)

corruptor.corrupt(text, seed=1)
# 'Screw you kuys, I am going home. (c)'

Now we can use our models to restore the initial text back:

from sage.spelling_correction import AvailableCorrectors
from sage.spelling_correction import RuM2M100ModelForSpellingCorrection, T5ModelForSpellingCorruption

text_ru = "Замтьте не я это предложил"
text_en = "Screw you kuys, I am going home. (c)"

corrector_fred = T5ModelForSpellingCorruption.from_pretrained(AvailableCorrectors.sage_fredt5_large.value)
corrector_m2m = RuM2M100ModelForSpellingCorrection.from_pretrained(AvailableCorrectors.m2m100_1B.value)
corrector_en = T5ModelForSpellingCorruption.from_pretrained(AvailableCorrectors.ent5_large.value)

print(corrector_fred.correct(text_ru))
# ['Заметьте, не я это предложил.']

print(corrector_m2m.correct(text_ru))
# ['Заметьте не я это предложил']

print(corrector_en.correct(text_en, prefix="grammar: "))
# ['Screw you guys, I am going home. (c)']

Evaluate performance of the models on open benchmarks for spelling correction:

import os
import torch
from sage.utils import DatasetsAvailable
from sage.spelling_correction import AvailableCorrectors
from sage.spelling_correction import T5ModelForSpellingCorruption

corrector_fred_95m = T5ModelForSpellingCorruption.from_pretrained(AvailableCorrectors.sage_fredt5_distilled_95m.value)
corrector_mt5 = T5ModelForSpellingCorruption.from_pretrained(AvailableCorrectors.sage_mt5_large.value)

corrector_fred_95m.model.to(torch.device("cuda:0"))
corrector_mt5.model.to(torch.device("cuda:0"))

metrics = corrector_fred_95m.evaluate("RUSpellRU", metrics=["errant", "ruspelleval"], batch_size=32)
print(metrics)
# {'CASE_Precision': 94.41, 'CASE_Recall': 92.55, 'CASE_F1': 93.47, 'SPELL_Precision': 77.52, 'SPELL_Recall': 64.09, 'SPELL_F1': 70.17, 'PUNCT_Precision': 86.77, 'PUNCT_Recall': 80.59, 'PUNCT_F1': 83.56, 'YO_Precision': 46.21, 'YO_Recall': 73.83, 'YO_F1': 56.84, 'Precision': 83.48, 'Recall': 74.75, 'F1': 78.87}

metrics = corrector_mt5.evaluate("/content/sage/data/example_data/jfleg", metrics=["ruspelleval"], batch_size=16)
print(metrics)
# {'Precision': 75.94, 'Recall': 88.15, 'F1': 81.59}

NOTE: if you are launching code snippet in Colab you'd probably end up with MEMORY ERROR, so manage evaluation procedures so that you meet available device's restrictions. As a feasible workaround you can execute

del corrector_fred_95m.model

to free some space.

Spelling Corruption

We implemented two methods for spelling corruption. Statistic-based Spelling Corruption (SBSC) aims to mimic human behaviour when making an error. While Augmentex relies on rule-based heuristics and common errors and mistypings especially those committed while typing text on a keyboard.

🚀 Both methods proved their effectiveness for spelling correction systems and celebrated substantial performance gains fully reported in our Paper.

Statistic-based Spelling Corruption (SBSC)

This method is thoroughly described in our another Paper and in this 🗣️Talk.

Briefly, SBSC follows two simple steps:

🧠 Analyze errors, their type and positions in a source text;
✏️ Reproduce errors from the source text in a new sentence;

🧠 To analyze errors in a source sentence we need its corresponding correction in order to build Levenshtein matrix, traverse it back starting from the bottom right entry and determine the exact position and type of an error. We then aggregate all obtained statistics and normalize it to valid discrete distributions.

✏️ "Reproduce" step is even less complicated: we just sample number of errors per sentence, their types and relative positions from corresponding distributions and apply them to a correct sentence.

As stated, you need a parallel dataset to "fit" SBSC. We provide a set of four datasets with natural errors covering exhaustive range of domains:

RUSpellRU: texts collected from LiveJournal, with manually corrected typos and errors;
MultidomainGold: examples from 7 text sources, including the open web, news, social media, reviews, subtitles, policy documents and literary works;
MedSpellChecker: texts with errors from medical anamnesis;
GitHubTypoCorpusRu: spelling errors and typos in commits from GitHub;

You can use them as simple as

import sage
from sage.spelling_corruption import SBSCConfig, SBSCCorruptor
from sage.utils import DatasetsAvailable

# Instantiate SBSC corruptor from a dataset with errors in medical anamnesis
config = SBSCConfig(
    reference_dataset_name_or_path=DatasetsAvailable.MedSpellchecker.name,
    reference_dataset_split="test"
)
corruptor = SBSCCorruptor.from_config(config)

... or you can initialize your SBSC from locally stored dataset:

import os
from sage.spelling_corruption import SBSCConfig, SBSCCorruptor

# Instantiate SBSC corruptor from a JFLEG dataset
config = SBSCConfig(
    lang="en",
    reference_dataset_name_or_path=os.path.join("data", "example_data", "jfleg"),
)
corruptor = SBSCCorruptor.from_config(config)

✅ To check how good SBSC actually approximates original errors, you can plot side-by-side graphs of original and synthetically generated distributions:

To access these graphs you can simply

from sage.utils import load_available_dataset_from_hf, draw_and_save_errors_distributions_comparison_charts
from sage.spelling_corruption.sbsc.labeler import process_mistypings
from sage.spelling_corruption import SBSCCorruptor

sources, corrections = load_available_dataset_from_hf("RUSpellRU", for_labeler=True, split="train")
ruspellru_stats, ruspellru_confusion_matrix, ruspellru_typos_cnt = process_mistypings(sources, corrections)

corruptor = SBSCCorruptor.from_default_config()
spoiled_sentences = corruptor.batch_corrupt(corrections)

sbsc_stats, sbsc_confusion_matrix, sbsc_typos_cnt = process_mistypings(spoiled_sentences, corrections)

draw_and_save_errors_distributions_comparison_charts(
    actual_typos_cnt = sbsc_typos_cnt,
    reference_typos_cnt=ruspellru_typos_cnt,
    actual_stats=sbsc_stats,
    reference_stats=ruspellru_stats,
    path_to_save="ruspellru_sbsc.jpg"
)

Augmentex

Augmentex introduces rule-based and common statistic (empowered by KartaSlov project) approach to insert errors in text. It is fully described again in the Paper and in this 🗣️Talk.

🖇️ Augmentex allows you to operate on two levels of granularity when it comes to text corruption and offers you sets of specific methods suited for particular level:

Word level:
- replace - replace a random word with its incorrect counterpart;
- delete - delete random word;
- swap - swap two random words;
- stopword - add random words from stop-list;
- reverse - change a case of the first letter of a random word;
Character level:
- shift - randomly swaps upper / lower case in a string;
- orfo - substitute correct characters with their common incorrect counterparts;
- typo - substitute correct characters as if they are mistyped on a keyboard;
- delete - delete random character;
- multiply - multiply random character;
- swap - swap two adjacent characters;
- insert - insert random character;

To access Augmentex you only need these few manipulations:

from sage.spelling_corruption import CharAugConfig, CharAugCorruptor

config = CharAugConfig(
    unit_prob=0.3, # proportion of characters that is going to undergo edits
    min_aug=1, # minimum number of edits
    max_aug=5, # maximum number of edits 
    mult_num=3 # `multiply` edit
)
corruptor = CharAugCorruptor.from_config(config)

... or like this:

from sage.spelling_corruption import WordAugConfig, WordAugCorruptor

config = WordAugConfig(
    unit_prob=0.4, # proportion of characters that is going to undergo edits
    min_aug=1, # minimum number of edits
    max_aug=5, # maximum number of edits 
)
corruptor = WordAugCorruptor.from_config(config)

Augmentex has been created by our fellow team, the project has its own repo, do not forget to take a look!

Spelling Correction

Our methodology for obtaining model with optimal performance on spellchecking task is thoroughly described in our Paper. And the algorithm is simple and generally consists of two steps:

Pre-train model on extensive parallel corpus with synthetically generated errors;
Fine-tune on combinations of available datasets for spelling correction with "human-made" errors;

We use Augmentex and SBSC for both generating large synthetic corpora and augmenting datasets with natural errors. The family of pre-trained correctors now amounts for 8 models.

We've 6 🤗Transformer models for Russian 🇷🇺:

sage-fredt5-large
sage-fredt5-distilled-95m
sage-m2m100-1.2B
M2M100-1.2B [Earlier release]
M2M100-418M [Earlier release]
FredT5-large [Earlier release]

And two models for English 🇬🇧:

Models for the Russian language have been pre-trained on combination of Russian Wikipedia and videos transcriptions with artificial errors generated by SBSC on statistics gathered from train split of RUSpellRU. Correctors for English trained on mixture of English Wikipedia articles and news posts with synthetic errors inserted by SBSC fitted on statistics from 5k subsample of BEA60k.

📚 We also validate our solutions on available datasets with "human-made" errors:

RUSpellRU: texts collected from LiveJournal, with manually corrected typos and errors;
MultidomainGold: examples from 7 text sources, including the open web, news, social media, reviews, subtitles, policy documents and literary works;
MedSpellChecker: texts with errors from medical anamnesis;
GitHubTypoCorpusRu: spelling errors and typos in commits from GitHub;
BEA60K: English spelling errors collected from several domains;
JFLEG: 1601 sentences in English, which contain about 2 thousand spelling errors;

📈 Here we report evaluation of some setups:

Zero-shot evaluation of pre-trained checkpoints;
Additional fine-tuning (ft.) on the target dataset;

Full list of setups and corresponding performances are in the Paper.

RUSpellRU, MultidomainGold, MedSpellChecker and GitHubTypoCorpusRu come from spellcheck_punctuation_benchmark. The benchmark accounts for both punctuation and spelling errors. For the simplicity and better representativeness we report results only for those models (sage-fredt5-large, sage-fredt5-distilled-95m) that deal with both types of errors (the Russian language). The detailed metrics for other checkpoints can be found either in the Paper, post or corresponding model card.

NOTE: MedSpellChecker and GitHubTypoCorpusRu do not have train split, so their performance on Pre-train + fine-tune setup is reported as a result of fine-tuning on combination of RUSpellRU and MultidomainGold datasets.

RUSpellRU Evaluation

Model	Pr. (spell)	Rec. (spell)	F1 (spell)	Pr. (punc)	Rec. (punc)	F1 (punc)	Pr. (case)	Rec. (case)	F1 (case)
sage-ai-service	90.3	86.3	88.2	90.3	86.6	88.4	95.2	95.9	95.6
sage-fredt5-large	57.3	68.0	62.2	86.7	46.1	60.2	92.1	67.8	78.1
sage-fredt5-large (ft.)	88.4	80.9	84.5	88.2	85.3	86.8	95.5	94.0	94.7
sage-fredt5-distilled-95m (ft.)	83.5	74.8	78.9	86.8	80.6	83.6	94.4	92.5	93.5
gpt-3.5-turbo	33.6	58.5	42.7	85.9	64.6	73.7	84.9	73.9	79.0
gpt-4	54.9	76.7	64.0	84.0	82.3	83.2	91.5	90.2	90.9

MultidomainGold Evaluation

Model	Pr. (spell)	Rec. (spell)	F1 (spell)	Pr. (punc)	Rec. (punc)	F1 (punc)	Pr. (case)	Rec. (case)	F1 (case)
sage-ai-service	81.6	77.7	79.6	70.2	67.5	68.8	80.5	80.5	80.5
sage-fredt5-large	43.4	49.7	46.3	21.8	21.3	21.6	58.8	23.9	34.0
sage-fredt5-large (ft.)	80.3	75.1	77.6	69.0	66.5	67.7	78.6	80.0	79.3
sage-fredt5-distilled-95m (ft.)	77.2	69.9	73.4	66.8	63.4	65.0	76.8	79.1	77.9
gpt-3.5-turbo	18.8	48.1	27.1	42.0	31.8	36.2	47.1	51.3	49.1
gpt-4	25.4	68.0	37.0	57.8	54.3	56.0	54.0	67.5	60.0

MedSpellchecker Evaluation

Model	Pr. (spell)	Rec. (spell)	F1 (spell)	Pr. (punc)	Rec. (punc)	F1 (punc)	Pr. (case)	Rec. (case)	F1 (case)
sage-ai-service	71.3	73.5	72.4	75.1	69.2	72.0	80.9	72.8	76.6
sage-fredt5-large	35.2	54.5	42.8	19.2	13.2	15.7	48.7	36.8	41.9
sage-fredt5-large (ft.)	72.5	72.2	72.3	74.6	66.4	70.3	79.3	85.1	82.1
sage-fredt5-distilled-95m (ft.)	65.1	64.8	64.9	78.6	63.1	70.0	63.5	74.7	68.7
gpt-3.5-turbo	14.7	45.9	22.3	69.9	52.3	59.8	26.4	41.8	32.3
gpt-4	37.8	72.3	49.6	81.4	64.3	71.9	73.0	62.1	67.1

GitHubTypoCorpusRu Evaluation

Model	Pr. (spell)	Rec. (spell)	F1 (spell)	Pr. (punc)	Rec. (punc)	F1 (punc)	Pr. (case)	Rec. (case)	F1 (case)
sage-ai-service	70.8	56.3	62.7	48.9	35.8	41.4	32.9	45.3	38.1
sage-fredt5-large	46.0	46.6	46.3	22.7	18.3	20.2	12.0	13.2	12.6
sage-fredt5-large (ft.)	67.5	53.2	59.5	48.5	38.0	42.6	37.3	50.0	42.7
sage-fredt5-distilled-95m (ft.)	57.8	48.5	52.7	45.2	39.5	42.1	29.9	46.2	36.3
gpt-3.5-turbo	23.7	38.7	29.4	37.6	23.3	28.7	19.6	35.9	25.3
gpt-4	27.0	52.8	35.7	45.9	32.6	38.2	25.7	36.8	30.2

BEA60K Evaluation

Model	Precision	Recall	F1
sage-mt5-large	64.7	83.8	73.0
T5-large-spell	66.5	83.1	73.9
gpt-3.5-turbo	66.9	84.1	74.5
gpt-4	68.6	85.2	76.0
Bert	65.8	79.6	72.0
SC-LSTM	62.2	80.3	72.0

JFLEG Evaluation

Model	Precision	Recall	F1
sage-mt5-large	74.9	88.4	81.1
T5-large-spell	83.4	84.3	83.8
gpt-3.5-turbo	77.8	88.6	82.9
gpt-4	77.9	88.3	82.8
Bert	78.5	85.4	81.8
SC-LSTM	80.6	86.1	83.2

RUSpellRU, MultidomainGold, MedSpellChecker and GitHubTypoCorpusRu are available as HuggingFace datasets here and through the API of our library:

from sage.utils import load_available_dataset_from_hf, DatasetsAvailable

print([dataset.name for dataset in DatasetsAvailable])
# ['MultidomainGold', 'RUSpellRU', 'MedSpellchecker', 'GitHubTypoCorpusRu', 'MultidomainGold_orth', 'RUSpellRU_orth', 'MedSpellchecker_orth', 'GitHubTypoCorpusRu_orth']

gold_dataset = load_available_dataset_from_hf(DatasetsAvailable.MultidomainGold.name, for_labeler=False)
print(len(gold_dataset))
# 7675

sources, corrections = load_available_dataset_from_hf(DatasetsAvailable.RUSpellRU.name, for_labeler=True, split="train")
print(len(sources), len(corrections))
# 2000 2000

Evaluation

We also provide functionality to evaluate the performance of spelling correction systems and rank them.

🎯 Currently two options are available:

ruspelleval;
ERRANT-based metric adapted for the Russian language;

Both algorithms output Precision, Recall and F1 scores that can be interpreted like the following:

Precision: one minus share of unnecessary amendments;
Recall: proportion of expected corrections;
F1: famous geometric mean of aforementioned two;

You can obtain these metrics simply by

from sage.evaluation import Scorer
from sage.utils import DatasetsAvailable, load_available_dataset_from_hf

sources, corrections = load_available_dataset_from_hf(DatasetsAvailable.RUSpellRU.name, for_labeler=True, split="test")

scorer = Scorer()
metrics = scorer.score(sources, corrections, corrections, metrics=["ruspelleval", "errant"])
print(metrics)
# {'Precision': 100.0, 'Recall': 100.0, 'F1': 100.0, 'CASE_Precision': 100.0, 'CASE_Recall': 100.0, 'CASE_F1': 100.0, 'SPELL_Precision': 100.0, 'SPELL_Recall': 100.0, 'SPELL_F1': 100.0, 'PUNCT_Precision': 100.0, 'PUNCT_Recall': 100.0, 'PUNCT_F1': 100.0, 'YO_Precision': 100.0, 'YO_Recall': 100.0, 'YO_F1': 100.0}

... or by directly assessing the model:

import os
import torch
from sage.utils import DatasetsAvailable
from sage.spelling_correction import AvailableCorrectors
from sage.spelling_correction import T5ModelForSpellingCorruption

corrector_fred_95m = T5ModelForSpellingCorruption.from_pretrained(AvailableCorrectors.sage_fredt5_distilled_95m.value)
corrector_mt5 = T5ModelForSpellingCorruption.from_pretrained(AvailableCorrectors.sage_mt5_large.value)

corrector_fred_95m.model.to(torch.device("cuda:0"))
corrector_mt5.model.to(torch.device("cuda:0"))

metrics = corrector_fred_95m.evaluate("RUSpellRU", metrics=["errant", "ruspelleval"], batch_size=32)
print(metrics)
# {'CASE_Precision': 94.41, 'CASE_Recall': 92.55, 'CASE_F1': 93.47, 'SPELL_Precision': 77.52, 'SPELL_Recall': 64.09, 'SPELL_F1': 70.17, 'PUNCT_Precision': 86.77, 'PUNCT_Recall': 80.59, 'PUNCT_F1': 83.56, 'YO_Precision': 46.21, 'YO_Recall': 73.83, 'YO_F1': 56.84, 'Precision': 83.48, 'Recall': 74.75, 'F1': 78.87}

metrics = corrector_mt5.evaluate("/content/sage/data/example_data/jfleg", metrics=["ruspelleval"], batch_size=16)
print(metrics)
# {'Precision': 75.94, 'Recall': 88.15, 'F1': 81.59}

The metrics output by ERRANT based algorithm are indicated by the corresponding prefix, which refers to the specific type of errors:

CASE: erroneously used case;
SPELL: spelling and grammar errors;
PUNCT: punctuation errors;
YO: unnecessary replacement of "YO" (ё) letter;

📌 Credit for evaluation script of ruspelleval metric goes to Aleksei Sorokin and his notable work in proceedings of SpellRueval.

Citation

If you want to know more about our work take a look at these publications:

💥 Our EACL 2024 Paper provides a thorough description of the methodology used to obtain SOTA models for spelling corrections as well the comprehensive reports of all experiments that have been carried out.

💫 While our Dialogue-2023 Paper focuses on exploiting resources for the task of spelling correction and procedures on obtaining high-quality parallel corpuses.

@inproceedings{martynov-etal-2024-methodology,
    title = "A Methodology for Generative Spelling Correction via Natural Spelling Errors Emulation across Multiple Domains and Languages",
    author = "Martynov, Nikita  and
      Baushenko, Mark  and
      Kozlova, Anastasia  and
      Kolomeytseva, Katerina  and
      Abramov, Aleksandr  and
      Fenogenova, Alena",
    editor = "Graham, Yvette  and
      Purver, Matthew",
    booktitle = "Findings of the Association for Computational Linguistics: EACL 2024",
    month = mar,
    year = "2024",
    address = "St. Julian{'}s, Malta",
    publisher = "Association for Computational Linguistics",
    url = "https://aclanthology.org/2024.findings-eacl.10",
    pages = "138--155",
    abstract = "Large language models excel in text generation and generalization, however they face challenges in text editing tasks, especially in correcting spelling errors and mistyping.In this paper, we present a methodology for generative spelling correction (SC), tested on English and Russian languages and potentially can be extended to any language with minor changes. Our research mainly focuses on exploring natural spelling errors and mistyping in texts and studying how those errors can be emulated in correct sentences to enrich generative models{'} pre-train procedure effectively. We investigate the effects of emulations in various text domains and examine two spelling corruption techniques: 1) first one mimics human behavior when making a mistake through leveraging statistics of errors from a particular dataset, and 2) second adds the most common spelling errors, keyboard miss clicks, and some heuristics within the texts.We conducted experiments employing various corruption strategies, models{'} architectures, and sizes in the pre-training and fine-tuning stages and evaluated the models using single-domain and multi-domain test sets. As a practical outcome of our work, we introduce SAGE (Spell checking via Augmentation and Generative distribution Emulation).",
}

@inproceedings{martynov2023augmentation,
  title={Augmentation methods for spelling corruptions},
  author={Martynov, Nikita and Baushenko, Mark and Abramov, Alexander and Fenogenova, Alena},
  booktitle={Proceedings of the International Conference “Dialogue},
  volume={2023},
  year={2023}
}

📌 Feel free to ask any questions regarding our work at corresponding point of contact:

[email protected]

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Spelling correction, corruption and evaluation for multiple languages

Install | Models | Evaluation | SBSC | Augmentex | Papers

News

Table of contents

Installation

Regular install

Editable install

Quick demo

Spelling Corruption

Statistic-based Spelling Corruption (SBSC)

Augmentex

Spelling Correction

RUSpellRU Evaluation

MultidomainGold Evaluation

MedSpellchecker Evaluation

GitHubTypoCorpusRu Evaluation

BEA60K Evaluation

JFLEG Evaluation

Evaluation

Citation

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Spelling correction, corruption and evaluation for multiple languages

Install | Models | Evaluation | SBSC | Augmentex | Papers

News

Table of contents

Installation

Regular install

Editable install

Quick demo

Spelling Corruption

Statistic-based Spelling Corruption (SBSC)

Augmentex

Spelling Correction

RUSpellRU Evaluation

MultidomainGold Evaluation

MedSpellchecker Evaluation

GitHubTypoCorpusRu Evaluation

BEA60K Evaluation

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