code: def score(self):
      return (
          100.0 * self.distance / self.ref_length
          if self.ref_length > 0
          else 0
      )
  
file_path: fairseq/fairseq/scoring/wer.py
imports: from dataclasses import dataclass, field
  from fairseq.dataclass import FairseqDataclass
  from fairseq.scoring import BaseScorer, register_scorer
  from fairseq.scoring.tokenizer import EvaluationTokenizer
label_desc: Use image node_id 5 for calling the WerScorer obj's underlying member method code with example usage: obj.score() and returns: unknown