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# Implementation of the WER method, exposed publicly
_default_transform = tr.Compose(
[
tr.RemoveMultipleSpaces(),
tr.Strip(),
tr.SentencesToListOfWords(),
tr.RemoveEmptyStrings(),
]
)
_standardize_transform = tr.Compose(
[
tr.ToLowerCase(),
tr.ExpandCommonEnglishContractions(),
tr.RemoveKaldiNonWords(),
tr.RemoveWhiteSpace(replace_by_space=True),
]
)
def wer(
truth: Union[str, List[str]],
hypothesis: Union[str, List[str]],
truth_transform: Union[tr.Compose, tr.AbstractTransform] = _default_transform,
hypothesis_transform: Union[tr.Compose, tr.AbstractTransform] = _default_transform,
**kwargs
) -> float:
"""
Calculate the WER between between a set of ground-truth sentences and a set of
hypothesis sentences.