code: def get_answer_begin_end(data):
      '''
      Get answer's index of begin and end.
      '''
      begin = []
      end = []
      for qa_pair in data:
          tokens = qa_pair['passage_tokens']
          char_begin = qa_pair['answer_begin']
          char_end = qa_pair['answer_end']
          word_begin = get_word_index(tokens, char_begin)
          word_end = get_word_index(tokens, char_end)
          begin.append(word_begin)
          end.append(word_end)
      return np.asarray(begin), np.asarray(endf get_answer_begin_end(data):
      '''
      Get answer's index of begin and end.
      '''
      begin = []
      end = []
      for qa_pair in data:
          tokens = qa_pair['passage_tokens']
          char_begin = qa_pair['answer_begin']
          char_end = qa_pair['answer_end']
          word_begin = get_word_index(tokens, char_begin)
          word_end = get_word_index(tokens, char_end)
          begin.append(word_begin)
          end.append(word_end)
      return np.asarray(begin), np.asarray(end)
docs: Get answer's index of begin and end.