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 __init__(self, opt, shared=None):
      self.opt = opt
      self.fixed_random = random.Random(42)
      self.label_candidates = [
          gend_utils.MASC,
          gend_utils.FEM,
          gend_utils.NEUTRAL,
      ]
      self.use_probably = opt["convai2_use_probably"]
      self.labels_to_use = opt["labels_to_use"]
      self.is_train = (
          "train" in opt["datatype"]
          and "evalmode" not in opt["datatype"]
      )
      self.is_valid = "valid" in opt["datatype"]
      self.add_unknown_classes = (
          opt["add_unknown_classes"] and self.is_train
      )
  
      if shared and "data" in shared:
          self.data = shared["data"]
          self.persona_map = shared["persona_map"]
      else:
          self.missing_cnt = 0
          self._load_persona_map(opt)
          self._setup_data(opt)
          if (self.is_train and opt["balance"]) or (
              self.is_valid and opt["balance_valid"]
          ):
              exclude_lst = gend_utils.ABOUT_CANDS
              self.data = gend_utils.balance_data(
                  self.data, exclude_labels=exclude_lst
              )
  
      self.label_candidates = gend_utils.ALL_CANDS
  
      opt = deepcopy(opt)
      super().__init__(opt, shared)
      self.reset()
  
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 2 to create a new Convai2Teacher object from inherited base classes: FixedDialogTeacher with example: obj = Convai2Teacher(opt, shared)