code: def create_fb_format(
      cls, out_path, dtype, inpath, d_vocab, d_label_answer
  ):
      print("building fbformat:" + dtype)
      fout = open(os.path.join(out_path, dtype + ".txt"), "w")
      lines = cls.readlines(inpath)
  
      for line in lines:
          fields = line.rstrip("\n").split("\t")
          if len(fields) != 4:
              raise ValueError(
                  "data file (%s) corrupted. Line (%s)"
                  % (repr(line), inpath)
              )
          else:
              _, s_q_wids, s_good_aids, s_bad_aids = fields
              q = cls.wids2sent(s_q_wids.split(), d_vocab)
              good_ans = [
                  d_label_answer[aid_] for aid_ in s_good_aids.split()
              ]
              bad_ans = [
                  d_label_answer[aid_] for aid_ in s_bad_aids.split()
              ]
              # save
              s = (
                  "1 "
                  + q
                  + "\t"
                  + "|".join(good_ans)
                  + "\t\t"
                  + "|".join(good_ans + bad_ans)
              )
              fout.write(s + "\n")
      fout.close()
  
imports: from typing import Optional
  import gzip
  import os
  from parlai.core.build_data import DownloadableFile
  from parlai.utils.io import PathManager
  import parlai.core.build_data
label_desc: Use image node_id 2 for calling the ParseInsuranceQAV2 obj's underlying member method code with example usage: obj.create_fb_format(cls, out_path, dtype, inpath, d_vocab, d_label_answer) without return types