code: def get_boxed_answer(self, answer):
      boxed_idx = answer.find("boxed{")
      final_answer = answer[boxed_idx:]
      final_answer = final_answer[
          final_answer.find("{") + 1 : final_answer.rfind("}")
      ]
      final_answer = self.clean_answer(final_answer)
      return final_answer
  
imports: import glob
  import json
  import os
  import random
  import re
  from parlai.tasks.math_dataset.build import build
  from parlai.core.opt import Opt
  from parlai.core.params import ParlaiParser
  from parlai.utils.io import PathManager
  from typing import List, Optional
  from parlai.tasks.reasoning.agents import MWPStepsReasoningTeacher
label_desc: Use image node_id 8 for calling the MathDatasetStepByStepReasoningTeacher obj's underlying member method code with example usage: obj.get_boxed_answer(answer) and returns: final_answer