xls-asr-vi-40h / eval.py

Upload lm-boosted decoder

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	#!/usr/bin/env python3
	import argparse
	import re
	from typing import Dict

	from datasets import Audio, Dataset, load_dataset, load_metric

	from transformers import AutoFeatureExtractor, pipeline, AutomaticSpeechRecognitionPipeline

	from transformers import Wav2Vec2CTCTokenizer

	class Wav2Vec2WordpieceTokenizer(Wav2Vec2CTCTokenizer):
	def __init__(
	self,
	vocab_file,
	bos_token="<s>",
	eos_token="</s>",
	unk_token="<unk>",
	pad_token="<pad>",
	word_delimiter_token="\|",
	do_lower_case=False,
	**kwargs
	):
	super().__init__(
	vocab_file=vocab_file,
	unk_token=unk_token,
	bos_token=bos_token,
	eos_token=eos_token,
	pad_token=pad_token,
	do_lower_case=do_lower_case,
	word_delimiter_token=word_delimiter_token,
	**kwargs,
	)

	self._create_trie(self.all_special_tokens_extended)

	def _tokenize(self, text, **kwargs):
	"""
	Converts a string in a sequence of tokens (string), using the tokenizer.
	"""
	special_cases = set(['gia', 'qui', 'quy', 'que', 'qua'])
	output_tokens = []
	for token_idx, token in enumerate(text.split()):
	if token in special_cases:
	sub_tokens = [token[:2], token[2:]]
	else:
	end = len(token)
	sub_tokens = []
	while end > 0:
	start = 0
	cur_substr = None
	while start < end:
	substr = token[start:end]
	if substr in self.encoder:
	cur_substr = substr
	break
	start += 1
	if cur_substr is None:
	sub_tokens.insert(0, self.unk_token)
	end = start - 1
	else:
	sub_tokens.insert(0, cur_substr)
	end = start

	if token_idx > 0:
	output_tokens.append(self.word_delimiter_token)
	output_tokens.extend(sub_tokens)
	return output_tokens

	def decode_ids(
	self,
	token_ids,
	skip_special_tokens = False,
	clean_up_tokenization_spaces = True,
	group_tokens: bool = True,
	spaces_between_special_tokens: bool = False,
	) -> str:
	# For compatible with speechbrain interfaces
	return self.decode(
	token_ids,
	skip_special_tokens=skip_special_tokens,
	clean_up_tokenization_spaces=clean_up_tokenization_spaces,
	group_tokens=group_tokens,
	spaces_between_special_tokens=spaces_between_special_tokens
	)

	def log_results(result: Dataset, args: Dict[str, str]):
	"""DO NOT CHANGE. This function computes and logs the result metrics."""

	log_outputs = args.log_outputs
	dataset_id = "_".join(args.dataset.split("/") + [args.config, args.split])

	# load metric
	wer = load_metric("wer")
	cer = load_metric("cer")

	# compute metrics
	wer_result = wer.compute(references=result["target"], predictions=result["prediction"])
	cer_result = cer.compute(references=result["target"], predictions=result["prediction"])

	# print & log results
	result_str = f"WER: {wer_result}\n" f"CER: {cer_result}"
	print(result_str)

	with open(f"{dataset_id}_eval_results.txt", "w") as f:
	f.write(result_str)

	# log all results in text file. Possibly interesting for analysis
	if log_outputs is not None:
	pred_file = f"log_{dataset_id}_predictions.txt"
	target_file = f"log_{dataset_id}_targets.txt"

	with open(pred_file, "w") as p, open(target_file, "w") as t:

	# mapping function to write output
	def write_to_file(batch, i):
	p.write(f"{i}" + "\n")
	p.write(batch["prediction"] + "\n")
	t.write(f"{i}" + "\n")
	t.write(batch["target"] + "\n")

	result.map(write_to_file, with_indices=True)


	def normalize_text(text: str) -> str:
	"""DO ADAPT FOR YOUR USE CASE. this function normalizes the target text."""

	chars_to_ignore_regex = '[,?.!\-\;\:"“%‘”�—’…–\|]' # noqa: W605 IMPORTANT: this should correspond to the chars that were ignored during training

	text = re.sub(chars_to_ignore_regex, "", text.lower())

	# In addition, we can normalize the target text, e.g. removing new lines characters etc...
	# note that order is important here!
	token_sequences_to_ignore = ["\n\n", "\n", " ", " "]

	for t in token_sequences_to_ignore:
	text = " ".join(text.split(t))

	return text


	def main(args):
	# load dataset
	dataset = load_dataset(args.dataset, args.config, split=args.split, use_auth_token=True)

	# for testing: only process the first two examples as a test
	dataset = dataset.select(range(10))

	# load processor
	feature_extractor = AutoFeatureExtractor.from_pretrained(args.model_id)
	sampling_rate = feature_extractor.sampling_rate

	# load tokenizer
	tokenizer = Wav2Vec2WordpieceTokenizer(
	vocab_file = args.model_id + 'vocab.json',
	)

	# resample audio
	dataset = dataset.cast_column("audio", Audio(sampling_rate=sampling_rate))

	# load eval pipeline
	asr = pipeline(
	"automatic-speech-recognition",
	model=args.model_id,
	tokenizer = tokenizer
	)
	# asr = AutomaticSpeechRecognitionPipeline(

	# )
	# map function to decode audio
	def map_to_pred(batch):
	prediction = asr(
	batch["audio"]["array"], chunk_length_s=args.chunk_length_s, stride_length_s=args.stride_length_s
	)

	batch["prediction"] = prediction["text"]
	batch["target"] = normalize_text(batch["sentence"])
	return batch

	# run inference on all examples
	result = dataset.map(map_to_pred, remove_columns=dataset.column_names)

	# compute and log_results
	# do not change function below
	log_results(result, args)


	if __name__ == "__main__":
	parser = argparse.ArgumentParser()

	parser.add_argument(
	"--model_id", type=str, required=True, help="Model identifier. Should be loadable with 🤗 Transformers"
	)
	parser.add_argument(
	"--dataset",
	type=str,
	required=True,
	help="Dataset name to evaluate the `model_id`. Should be loadable with 🤗 Datasets",
	)
	parser.add_argument(
	"--config", type=str, required=True, help="Config of the dataset. E.g. `'en'` for Common Voice"
	)
	parser.add_argument("--split", type=str, required=True, help="Split of the dataset. E.g. `'test'`")
	parser.add_argument(
	"--chunk_length_s", type=float, default=None, help="Chunk length in seconds. Defaults to 5 seconds."
	)
	parser.add_argument(
	"--stride_length_s", type=float, default=None, help="Stride of the audio chunks. Defaults to 1 second."
	)
	parser.add_argument(
	"--log_outputs", action="store_true", help="If defined, write outputs to log file for analysis."
	)
	args = parser.parse_args()

	main(args)