code: def _load_data_dump(self, datatype):
      d_type = datatype.split(":")[0]
      loaded_data = []
      with PathManager.open(
          os.path.join(
              self.data_path,
              f"pos_{self.troll_type}{FILE_TYPE_EXTENSIONS[d_type]}",
          ),
          "rb",
      ) as f:
          dump = list(f)
      for json_str in dump:
          loaded_data.append(json.loads(json_str))
      return loaded_data
  
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 1 for calling the PosSafetyMixTeacher obj's underlying member method code with example usage: obj._load_data_dump(datatype) and returns: loaded_data