code: def setup_data(self, path):
      # note that path is the value provided by opt['datafile']
      print("loading: " + path)
      with PathManager.open(path) as data_file:
          for data_line in data_file:
              data_item = json.loads(data_line)
  
              for turn_id, turn in enumerate(data_item["turns"]):
                  new_episode = False
                  turn["labels"] = "none"
                  del turn["auxiliary"]
                  if turn_id == 0:
                      new_episode = True
                  if turn_id == len(data_item["turns"]) - 1:
                      if data_item["is_contradiction"]:
                          turn["labels"] = "contradiction"
                      else:
                          turn["labels"] = "non_contradiction"
                      turn["auxiliary"] = {
                          "contradiction_indices": data_item[
                              "aggregated_contradiction_indices"
                          ]
                      }
  
                  yield turn, new_episode
  
file_path: ParlAI/parlai/tasks/decode/agents.py
imports: import copy
  import json
  import os
  from parlai.utils.io import PathManager
  from parlai.core.teachers import DialogTeacher
  from .build import build, DECODE, DECODE_PREFIX, DECODE_FOLDER_VERSION
label_desc: Use image node_id 3 for calling the DecodeTeacher obj's underlying member method code with example usage: obj.setup_data(path) without return types