code: def __init__(self, opt, shared=None):
      opt = copy.deepcopy(opt)
      self.datatype = opt["datatype"]
      opt["datafile"] = _path(opt, is_passage=False)
      super().__init__(opt, shared)
  
file_path: ParlAI/parlai/tasks/ms_marco/agents.py
imports: import copy
  import json
  import os
  from parlai.core.teachers import DialogTeacher, FbDeprecatedDialogTeacher
  from parlai.utils.io import PathManager
  from .build import build
label_desc: Use image node_id 1 to create a new DefaultTeacher object from inherited base classes: DialogTeacher with example: obj = DefaultTeacher(opt, shared)