eval script with normalization

eval.py

@@ -0,0 +1,195 @@
+#!/usr/bin/env python3
+import argparse
+import re
+from typing import Dict
+
+import torch
+from datasets import Audio, Dataset, load_dataset, load_metric
+
+from transformers import AutoFeatureExtractor, pipeline
+
+import re
+from num2words import num2words
+
+
+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 spell_num(text):
+    l = []
+    for t in text.split():
+        if t.isdigit():
+            l.append(num2words(t, lang='de'))
+        else:
+            l.append(t)
+    
+    return ' '.join(l)
+
+ALLOWED_CHARS = {
+    'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+    'ä', 'ö', 'ü',
+    '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
+    ' ',
+    ',', ';', ':', '.', '?', '!',
+}
+WHITESPACE_REGEX = re.compile(r'[ \t]+')
+
+
+def preprocess_transcript_for_corpus(transcript):
+    transcript = transcript.lower()
+    transcript = transcript.replace('á', 'a')
+    transcript = transcript.replace('à', 'a')
+    transcript = transcript.replace('â', 'a')
+    transcript = transcript.replace('ç', 'c')
+    transcript = transcript.replace('é', 'e')
+    transcript = transcript.replace('è', 'e')
+    transcript = transcript.replace('ê', 'e')
+    transcript = transcript.replace('í', 'i')
+    transcript = transcript.replace('ì', 'i')
+    transcript = transcript.replace('î', 'i')
+    transcript = transcript.replace('ñ', 'n')
+    transcript = transcript.replace('ó', 'o')
+    transcript = transcript.replace('ò', 'o')
+    transcript = transcript.replace('ô', 'o')
+    transcript = transcript.replace('ú', 'u')
+    transcript = transcript.replace('ù', 'u')
+    transcript = transcript.replace('û', 'u')
+    transcript = transcript.replace('ș', 's')
+    transcript = transcript.replace('ş', 's')
+    transcript = transcript.replace('ß', 'ss')
+    transcript = transcript.replace('-', ' ')
+    # Not used consistently, better to replace with space as well
+    transcript = transcript.replace('–', ' ')
+    transcript = transcript.replace('/', ' ')
+    transcript = WHITESPACE_REGEX.sub(' ', transcript)
+    transcript = ''.join([char for char in transcript if char in ALLOWED_CHARS])
+    transcript = WHITESPACE_REGEX.sub(' ', transcript)
+    transcript = spell_num(transcript)
+    transcript = transcript.replace('ß', 'ss')
+    transcript = transcript.strip()
+
+    return transcript
+
+def normalize_text(text: str) -> str:
+    """DO ADAPT FOR YOUR USE CASE. this function normalizes the target text."""
+
+    text = preprocess_transcript_for_corpus(txt)
+    chars_to_ignore_regex = '[,?.!\-\;\:"“%‘”�—’…–]'  
+    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.strip()
+
+
+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
+
+    # 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=args.model_id, device=args.device)
+
+    # 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."
+    )
+    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.",
+    )
+    args = parser.parse_args()
+
+    main(args)