code: def setup_data(self, input_path):
      print("loading: " + input_path)
  
      new_episode = True
  
      with PathManager.open(input_path) as file:
          data = json.load(file)
  
      for dialogue in data:
          for line in dialogue["dialogue"]:
              answer = [
                  ":".join(turn_label)
                  for turn_label in line["turn_label"]
              ]
              question = "What is the change in the dialogue state?"
              context = line["transcript"]
              if answer:
                  yield (
                      context + "\n" + question,
                      answer,
                      None,
                      None,
                  ), new_episode
  
file_path: ParlAI/parlai/tasks/woz/agents.py
imports: from parlai.core.teachers import DialogTeacher
  from parlai.utils.io import PathManager
  from .build import build
  import os
  import json
  import copy
label_desc: Use image node_id 2 for calling the WoZTeacher obj's underlying member method code with example usage: obj.setup_data(input_path) without return types