class_docstr: Predict the gender of character given the dialogue utterance.
class_docstr_tok: ["Predict","the","gender","of","character","given","the","dialogue","utterance","."]
code: def _load_persona_map(self, opt):
      build(opt)
      persona_map_path = os.path.join(
          opt["datapath"],
          "md_gender",
          "data_to_release",
          "convai2",
          "convai2_all_personas_map.json",
      )
      with open(persona_map_path, "rb") as f:
          self.persona_map = json.load(f)
  
imports: from typing import Optional
  from parlai.core.params import ParlaiParser
  from parlai.core.opt import Opt
  from parlai.core.message import Message
  from parlai.core.teachers import FixedDialogTeacher
  from parlai.tasks.convai2.agents import BothTeacher
  from parlai.tasks.md_gender.build import build
  from parlai.utils.misc import warn_once
  import parlai.tasks.md_gender.utils
  from copy import deepcopy
  import json
  import random
  import os
label_desc: Use image node_id 3 for calling the Convai2Teacher obj's underlying member method code with example usage: obj._load_persona_map(opt) without return types