code: def get_answers(cls, doc, turn_id):
      # Returns unique answers and valid alternatives (Some questions in CoQA have multiple valid answers).
      answers = []
      answer_forturn = doc["answers"]["input_text"][turn_id - 1]
      answers.append(answer_forturn)
  
      additional_answers = doc.get("additional_answers")
      if additional_answers:
          for key in additional_answers:
              additional_answer_for_turn = additional_answers[key][
                  "input_text"
              ][turn_id - 1]
              if additional_answer_for_turn.lower() not in map(
                  str.lower, answers
              ):
                  answers.append(additional_answer_for_turn)
      return answers
  
imports: import inspect
  import transformers.data.metrics.squad_metrics
  import lm_eval.datasets.coqa.coqa
  from lm_eval.base import Task, rf, mean
  from itertools import zip_longest
label_desc: Use image node_id 10 for calling the CoQA obj's underlying member method code with example usage: obj.get_answers(cls, doc, turn_id) and returns: answers