code: def __init__(self, opt, shared=None):
      self.opt = opt
      dpath = _path(opt)
      self.data_path = dpath
      self.troll_type = opt["mix_user_type"]
      assert (
          self.troll_type in TROLL_TYPES
      ), f"{self.troll_type} not supported."
  
      self.fixed_random = random.Random(42)
      self.label_candidates = [NOT_OK_CLASS, OK_CLASS]
  
      if shared and "data" in shared:
          self.data = shared["data"]
      else:
          self._setup_data(opt["datatype"])
      super().__init__(opt, shared)
      self.reset()
  
imports: import json
  import random
  from typing import Optional
  from parlai.core.message import Message
  from parlai.core.opt import Opt
  from parlai.core.params import ParlaiParser
  from parlai.core.teachers import FixedDialogTeacher
  from parlai.tasks.dialogue_safety.agents import StandardTeacher, NOT_OK_CLASS, OK_CLASS
  from parlai.utils.io import PathManager
  from .build import build, FILE_TYPE_EXTENSIONS, TROLL_TYPES
  import os
label_desc: Use image node_id 2 to create a new SafetyMixTeacher object from inherited base classes: FixedDialogTeacher with example: obj = SafetyMixTeacher(opt, shared)