Moreno La Quatra

Create eval.py

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

	import torch
	from src.data.normalization import normalize_string
	from datasets import Audio, Dataset, load_dataset, load_metric

	from transformers import (
	AutoFeatureExtractor,
	pipeline,
	AutoTokenizer,
	Wav2Vec2Processor,
	Wav2Vec2ProcessorWithLM,
	Wav2Vec2ForCTC,
	AutoConfig,
	)


	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, invalid_chars_regex: str, to_lower: bool) -> str:
	"""DO ADAPT FOR YOUR USE CASE. this function normalizes the target text."""
	text = normalize_string(text)
	text = text.lower() if to_lower else text.upper()

	text = re.sub(invalid_chars_regex, " ", text)
	text = re.sub("\s+", " ", text).strip()

	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

	if args.ctcdecode:
	processor = Wav2Vec2ProcessorWithLM.from_pretrained(args.model_id)
	decoder = processor.decoder
	else:
	processor = Wav2Vec2Processor.from_pretrained(args.model_id)
	decoder = None

	feature_extractor = processor.feature_extractor
	tokenizer = processor.tokenizer
	sampling_rate = feature_extractor.sampling_rate

	config = AutoConfig.from_pretrained(args.model_id)
	model = Wav2Vec2ForCTC.from_pretrained(args.model_id)

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

	# load eval pipeline
	if args.device is None:
	args.device = 0 if torch.cuda.is_available() else -1

	asr = pipeline(
	"automatic-speech-recognition",
	model=model,
	config=config,
	feature_extractor=feature_extractor,
	decoder=decoder,
	tokenizer=tokenizer,
	device=args.device,
	)

	# build normalizer config
	tokenizer = AutoTokenizer.from_pretrained(args.model_id)
	tokens = [
	x for x in tokenizer.convert_ids_to_tokens(range(0, tokenizer.vocab_size))
	]
	special_tokens = [
	tokenizer.pad_token,
	tokenizer.word_delimiter_token,
	tokenizer.unk_token,
	tokenizer.bos_token,
	tokenizer.eos_token,
	]
	non_special_tokens = [x for x in tokens if x not in special_tokens]
	invalid_chars_regex = f"[^\s{re.escape(''.join(set(non_special_tokens)))}]"
	normalize_to_lower = False
	for token in non_special_tokens:
	if token.isalpha() and token.islower():
	normalize_to_lower = True
	break

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

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

	def map_and_decode(batch):
	inputs = processor(
	batch["audio"]["array"],
	sampling_rate=batch["audio"]["sampling_rate"],
	return_tensors="pt",
	)
	with torch.no_grad():
	logits = model(**inputs).logits
	transcription = processor.batch_decode(logits.numpy()).text
	batch["prediction"] = transcription
	batch["target"] = normalize_text(
	batch["sentence"], invalid_chars_regex, normalize_to_lower
	)
	return batch

	# transcription = .lower()
	# 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.",
	)
	parser.add_argument(
	"--ctcdecode",
	action="store_true",
	help="Apply the ctc decoder to the output (only if present in the model card).",
	)
	parser.add_argument(
	"--device",
	type=int,
	default=None,
	help="The device to run the pipeline on. -1 for CPU (default), 0 for the first GPU and so on.",
	)
	parser.add_argument(
	"--beam_width",
	type=int,
	default=1,
	help="Beam width used by the pyctc decoder.",
	)
	args = parser.parse_args()

	main(args)