code: def __init__(self, opt, shared=None):
      opt = copy.deepcopy(opt)
      opt["datafile"] = _path(opt)
      if "stream" not in opt["datatype"]:
          print(
              "Dataset might not fit in memory. If this is the case, use"
              + ' streaming by setting "-dt '
              + opt["datatype"]
              + ':stream".'
          )
      super().__init__(opt, shared)
  
file_path: ParlAI/parlai/tasks/booktest/agents.py
imports: from parlai.core.teachers import FbDeprecatedDialogTeacher
  from .build import build
  import copy
  import os
label_desc: Use image node_id 1 to create a new DefaultTeacher object from inherited base classes: FbDeprecatedDialogTeacher with example: obj = DefaultTeacher(opt, shared)