code: def setup_data(path):
      print("loading: " + path)
  
      if path is None:
          return iter(())
  
      with PathManager.open(path) as data_file:
          dialogs = json.load(data_file)
  
      return DefaultTeacher._data_generator(dialogs)
  
file_path: ParlAI/parlai/tasks/convai_chitchat/agents.py
imports: from .build import build
  from parlai.core.teachers import DialogTeacher
  from parlai.utils.io import PathManager
  import json
  import os
label_desc: Use image node_id 6 for calling the DefaultTeacher obj's underlying member method code with example usage: obj.setup_data(path) and returns: DefaultTeacher, iter