code: def _format_answers(self, answers):
      formatted_answers = []
      for answer in answers:
          answer = answer.strip()
          if len(answer):
              # Add a period after all answers.
              if answer[-1] != ".":
                  formatted_answers.append(answer + ".")
              else:
                  formatted_answers.append(answer)
      return formatted_answers
  
imports: import numpy
  import sacrebleu
  import datasets
  from rouge_score import rouge_scorer, scoring
  from lm_eval.base import rf, Task
  from lm_eval.metrics import mean
  from lm_eval.utils import bleu, rouge
label_desc: Use image node_id 6 for calling the TruthfulQAGeneration obj's underlying member method code with example usage: obj._format_answers(answers) and returns: formatted_answers