code: def __init__(self, opt, shared=None):
      # store datatype
      self.dt = opt.get("datatype", "train").split(":")[0]
  
      # store identifier for the teacher in the dialog
      self.id = "cnn_dm"
      self.datapath = os.path.join(opt["datapath"], "CNN_DM")
  
      opt["datafile"] = self._path(opt)
  
      super().__init__(opt, shared)
  
file_path: ParlAI/parlai/tasks/cnn_dm/agents.py
imports: from parlai.core.teachers import DialogTeacher
  from parlai.utils.io import PathManager
  from .build import build
  import os
  import unicodedata
label_desc: Use image node_id 1 to create a new CNNDMTeacher object from inherited base classes: DialogTeacher with example: obj = CNNDMTeacher(opt, shared)