





from jiwer import compute_measures

import datasets


UpperCAmelCase     :     str							=	"""\
@inproceedings{inproceedings,
    author = {Morris, Andrew and Maier, Viktoria and Green, Phil},
    year = {2004},
    month = {01},
    pages = {},
    title = {From WER and RIL to MER and WIL: improved evaluation measures for connected speech recognition.}
}
"""

UpperCAmelCase     :     Dict							=	"""\
Word error rate (WER) is a common metric of the performance of an automatic speech recognition system.

The general difficulty of measuring performance lies in the fact that the recognized word sequence can have a different length from the reference word sequence (supposedly the correct one). The WER is derived from the Levenshtein distance, working at the word level instead of the phoneme level. The WER is a valuable tool for comparing different systems as well as for evaluating improvements within one system. This kind of measurement, however, provides no details on the nature of translation errors and further work is therefore required to identify the main source(s) of error and to focus any research effort.

This problem is solved by first aligning the recognized word sequence with the reference (spoken) word sequence using dynamic string alignment. Examination of this issue is seen through a theory called the power law that states the correlation between perplexity and word error rate.

Word error rate can then be computed as:

WER = (S + D + I) / N = (S + D + I) / (S + D + C)

where

S is the number of substitutions,
D is the number of deletions,
I is the number of insertions,
C is the number of correct words,
N is the number of words in the reference (N=S+D+C).

This value indicates the average number of errors per reference word. The lower the value, the better the
performance of the ASR system with a WER of 0 being a perfect score.
"""

UpperCAmelCase     :     Dict							=	"""
Compute WER score of transcribed segments against references.

Args:
    references: List of references for each speech input.
    predictions: List of transcriptions to score.
    concatenate_texts (bool, default=False): Whether to concatenate all input texts or compute WER iteratively.

Returns:
    (float): the word error rate

Examples:

    >>> predictions = [\"this is the prediction\", \"there is an other sample\"]
    >>> references = [\"this is the reference\", \"there is another one\"]
    >>> wer = datasets.load_metric(\"wer\")
    >>> wer_score = wer.compute(predictions=predictions, references=references)
    >>> print(wer_score)
    0.5
"""







@datasets.utils.file_utils.add_start_docstrings(_DESCRIPTION						,    _KWARGS_DESCRIPTION)
class     __lowerCAmelCase	(   datasets.Metric):







      def        _lowercase  (   self							)       ->						Any:



        '''simple docstring'''




        return datasets.MetricInfo(
            description=_DESCRIPTION		,				citation=_CITATION		,				inputs_description=_KWARGS_DESCRIPTION		,				features=datasets.Features(
                {
                    "predictions": datasets.Value("string"		,				id="sequence"							),
                    "references": datasets.Value("string"		,				id="sequence"							),
                }							)		,				codebase_urls=["https://github.com/jitsi/jiwer/"]		,				reference_urls=[
                "https://en.wikipedia.org/wiki/Word_error_rate",
            ]		,				)







      def        _lowercase  (   self		,				lowerCAmelCase__=None		,				lowerCAmelCase__=None		,				lowerCAmelCase__=False							)       ->						Union[str, Any]:



        '''simple docstring'''




        if concatenate_texts:
          return compute_measures(lowerCAmelCase__		,				lowerCAmelCase__							)["wer"]
        else:
          a__     : int  =0
          a__     : Optional[int]  =0
          for prediction, reference in zip(lowerCAmelCase__		,				lowerCAmelCase__							):
            a__     : Tuple  =compute_measures(lowerCAmelCase__		,				lowerCAmelCase__							)
            incorrect += measures["substitutions"] + measures["deletions"] + measures["insertions"]
            total += measures["substitutions"] + measures["deletions"] + measures["hits"]
          return incorrect / total













import warnings

from transformers import AutoTokenizer
from transformers.utils import is_torch_available
from transformers.utils.generic import ExplicitEnum

from ...processing_utils import ProcessorMixin


if is_torch_available():
     import torch







class     __lowerCAmelCase	(   UpperCamelCase__):
      _lowercase    : Any            =      """char"""
      _lowercase    : str            =      """bpe"""
      _lowercase    : List[Any]            =      """wp"""
UpperCAmelCase     :     List[Any]							=	(DecodeType.CHARACTER, DecodeType.BPE, DecodeType.WORDPIECE)







class     __lowerCAmelCase	(   UpperCamelCase__):
      _lowercase    : Tuple            =      ["""image_processor""", """char_tokenizer"""]
      _lowercase    : Any            =      """ViTImageProcessor"""
      _lowercase    : Optional[Any]            =      """MgpstrTokenizer"""







      def __init__(   self		,				lowerCAmelCase__=None		,				lowerCAmelCase__=None		,				**lowerCAmelCase__							)       ->						Optional[Any]:



        '''simple docstring'''




        a__     : Optional[int]  =None
        if "feature_extractor" in kwargs:
          warnings.warn(
              "The `feature_extractor` argument is deprecated and will be removed in v5, use `image_processor`"
              " instead."		,				lowerCAmelCase__		,				)
          a__     : List[str]  =kwargs.pop("feature_extractor"							)

        a__     : List[str]  =image_processor if image_processor is not None else feature_extractor
        if image_processor is None:
          raise ValueError("You need to specify an `image_processor`."							)
        if tokenizer is None:
          raise ValueError("You need to specify a `tokenizer`."							)

        a__     : str  =tokenizer
        a__     : List[str]  =AutoTokenizer.from_pretrained("gpt2"							)
        a__     : Optional[int]  =AutoTokenizer.from_pretrained("bert-base-uncased"							)

        super().__init__(lowerCAmelCase__		,				lowerCAmelCase__							)







      def __call__(   self		,				lowerCAmelCase__=None		,				lowerCAmelCase__=None		,				lowerCAmelCase__=None		,				**lowerCAmelCase__							)       ->						Union[str, Any]:



        '''simple docstring'''




        if images is None and text is None:
          raise ValueError("You need to specify either an `images` or `text` input to process."							)

        if images is not None:
          a__     : Union[str, Any]  =self.image_processor(lowerCAmelCase__		,				return_tensors=lowerCAmelCase__		,				**lowerCAmelCase__							)
        if text is not None:
          a__     : int  =self.char_tokenizer(lowerCAmelCase__		,				return_tensors=lowerCAmelCase__		,				**lowerCAmelCase__							)

        if text is None:
          return inputs
        elif images is None:
          return encodings
        else:
          a__     : Tuple  =encodings["input_ids"]
          return inputs







      def        _lowercase  (   self		,				lowerCAmelCase__							)       ->						Optional[Any]:



        '''simple docstring'''




        a__ ,							a__ ,							a__     : Any  =sequences
        a__     : Union[str, Any]  =char_preds.size(0							)

        a__ ,							a__     : Dict  =self._decode_helper(lowerCAmelCase__		,				"char"							)
        a__ ,							a__     : List[Any]  =self._decode_helper(lowerCAmelCase__		,				"bpe"							)
        a__ ,							a__     : Optional[int]  =self._decode_helper(lowerCAmelCase__		,				"wp"							)

        a__     : List[Any]  =[]
        a__     : Dict  =[]
        for i in range(lowerCAmelCase__							):
          a__     : int  =[char_scores[i], bpe_scores[i], wp_scores[i]]
          a__     : Tuple  =[char_strs[i], bpe_strs[i], wp_strs[i]]
          a__     : Any  =scores.index(max(lowerCAmelCase__							)							)
          final_strs.append(strs[max_score_index]							)
          final_scores.append(scores[max_score_index]							)

        a__     : Dict  ={}
        a__     : str  =final_strs
        a__     : Optional[int]  =final_scores
        a__     : Union[str, Any]  =char_strs
        a__     : List[str]  =bpe_strs
        a__     : Union[str, Any]  =wp_strs
        return out







      def        _lowercase  (   self		,				lowerCAmelCase__		,				lowerCAmelCase__							)       ->						Tuple:



        '''simple docstring'''




        if format == DecodeType.CHARACTER:
          a__     : Optional[Any]  =self.char_decode
          a__     : Dict  =1
          a__     : Tuple  ="[s]"
        elif format == DecodeType.BPE:
          a__     : str  =self.bpe_decode
          a__     : Dict  =2
          a__     : Optional[int]  ="#"
        elif format == DecodeType.WORDPIECE:
          a__     : Union[str, Any]  =self.wp_decode
          a__     : List[Any]  =1_0_2
          a__     : Dict  ="[SEP]"
        else:
          raise ValueError(F'''Format {format} is not supported.'''							)

        a__ ,							a__     : Any  =[], []
        a__     : str  =pred_logits.size(0							)
        a__     : Optional[Any]  =pred_logits.size(1							)
        a__ ,							a__     : Optional[int]  =pred_logits.topk(1		,				dim=-1		,				largest=lowerCAmelCase__		,				sorted=lowerCAmelCase__							)
        a__     : Optional[Any]  =preds_index.view(-1		,				lowerCAmelCase__							)[:, 1:]
        a__     : Dict  =decoder(lowerCAmelCase__							)
        a__ ,							a__     : Any  =torch.nn.functional.softmax(lowerCAmelCase__		,				dim=2							).max(dim=2							)
        a__     : int  =preds_max_prob[:, 1:]

        for index in range(lowerCAmelCase__							):
          a__     : Optional[Any]  =preds_str[index].find(lowerCAmelCase__							)
          a__     : Optional[int]  =preds_str[index][:pred_eos]
          a__     : List[Any]  =preds_index[index].cpu().tolist()
          a__     : List[Any]  =pred_index.index(lowerCAmelCase__							) if eos_token in pred_index else -1
          a__     : Union[str, Any]  =preds_max_prob[index][: pred_eos_index + 1]
          a__     : List[Any]  =pred_max_prob.cumprod(dim=0							)[-1] if pred_max_prob.nelement() != 0 else 0.0
          dec_strs.append(lowerCAmelCase__							)
          conf_scores.append(lowerCAmelCase__							)

        return dec_strs, conf_scores







      def        _lowercase  (   self		,				lowerCAmelCase__							)       ->						str:



        '''simple docstring'''




        a__     : int  =[seq.replace(" "		,				""							) for seq in self.char_tokenizer.batch_decode(lowerCAmelCase__							)]
        return decode_strs







      def        _lowercase  (   self		,				lowerCAmelCase__							)       ->						Tuple:



        '''simple docstring'''




        return self.bpe_tokenizer.batch_decode(lowerCAmelCase__							)







      def        _lowercase  (   self		,				lowerCAmelCase__							)       ->						Optional[Any]:



        '''simple docstring'''




        a__     : List[Any]  =[seq.replace(" "		,				""							) for seq in self.wp_tokenizer.batch_decode(lowerCAmelCase__							)]
        return decode_strs






