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ruT5-ASR

Model was trained by bond005 to correct errors in the ASR output (in particular, output of Wav2Vec2-Large-Ru-Golos). The model is based on ruT5-base.

Usage

To correct ASR outputs the model can be used as a standalone sequence-to-sequence model as follows:

from transformers import T5ForConditionalGeneration, T5Tokenizer
import torch


def rescore(text: str, tokenizer: T5Tokenizer,
            model: T5ForConditionalGeneration) -> str:
    if len(text) == 0:  # if an input text is empty, then we return an empty text too
        return ''
    ru_letters = set('аоуыэяеёюибвгдйжзклмнпрстфхцчшщьъ')
    punct = set('.,:/\\?!()[]{};"\'-')
    x = tokenizer(text, return_tensors='pt', padding=True).to(model.device)
    max_size = int(x.input_ids.shape[1] * 1.5 + 10)
    min_size = 3
    if x.input_ids.shape[1] <= min_size:
        return text  # we don't rescore a very short text
    out = model.generate(**x, do_sample=False, num_beams=5,
                         max_length=max_size, min_length=min_size)
    res = tokenizer.decode(out[0], skip_special_tokens=True).lower().strip()
    res = ' '.join(res.split())
    postprocessed = ''
    for cur in res:
        if cur.isspace() or (cur in punct):
            postprocessed += ' '
        elif cur in ru_letters:
            postprocessed += cur
    return (' '.join(postprocessed.strip().split())).replace('ё', 'е')


# load model and tokenizer
tokenizer_for_rescoring = T5Tokenizer.from_pretrained('bond005/ruT5-ASR')
model_for_rescoring = T5ForConditionalGeneration.from_pretrained('bond005/ruT5-ASR')
if torch.cuda.is_available():
    model_for_rescoring = model_for_rescoring.cuda()

input_examples = [
    'уласны в москве интерне только в большом году что лепровели',
    'мороз и солнце день чудесный',
    'нейро сети эта харошо',
    'да'
]

for src in input_examples:
    rescored = rescore(src, tokenizer_for_rescoring, model_for_rescoring)
    print(f'{src} -> {rescored}')

уласны в москве интерне только в большом году что лепровели -> у нас в москве интернет только в прошлом году что ли провели
мороз и солнце день чудесный -> мороз и солнце день чудесный
нейро сети эта харошо -> нейросети это хорошо
да -> да

Evaluation

This model was evaluated on the test subsets of SberDevices Golos, Common Voice 6.0 (Russian part), and Russian Librispeech, but it was trained on the training subset of SberDevices Golos only. You can see the evaluation script on other datasets, including Russian Librispeech and SOVA RuDevices, on my Kaggle web-page https://www.kaggle.com/code/bond005/wav2vec2-t5-ru-eval

Comparison with "pure" Wav2Vec2-Large-Ru-Golos (WER, %):

dataset name	pure ASR	ASR with rescoring
Voxforge Ru	27.08	40.48
Russian LibriSpeech	21.87	23.77
Sova RuDevices	25.41	20.13
Golos Crowd	10.14	9.42
Golos Farfield	20.35	17.99
CommonVoice Ru	18.55	11.60

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