class_docstr: Qa Evaluator. Now, we support metrics `'bleu'`
      
class_docstr_tok: ["Qa","Evaluator",".","Now",",","we","support","metrics","`","'bleu","'","`"]
code: def _exact_match_score(self, prediction, ground_truth):
      return self._normalize_answer(
          prediction
      ) == self._normalize_answer(ground_truth)
  
file_path: TextBox/textbox/evaluator/qa_evaluator.py
imports: import string
  import re
  import numpy
  from .abstract_evaluator import AbstractEvaluator
  from collections import Counter
label_desc: Use image node_id 4 for calling the QaEvaluator obj's underlying member method code with example usage: obj._exact_match_score(prediction, ground_truth) and returns: unknown