code: def setup_data(self, path):
      with PathManager.open(path) as data_file:
          for jline in data_file:
              d_example = json.loads(jline)
              context = [
                  d["passage_text"] for d in d_example["passages"]
              ]
              question = d_example["query"]
              if not self.datatype.startswith("test"):
                  answers = d_example["answers"]
                  if not answers:
                      answers = [
                          "NULL"
                      ]  # empty list of answers will cause exception
              else:
                  answers = ["NULL"]
              yield (
                  "\n".join(context) + "\n" + question,
                  answers,
              ), True
  
file_path: ParlAI/parlai/tasks/ms_marco/agents.py
imports: import copy
  import json
  import os
  from parlai.core.teachers import DialogTeacher, FbDeprecatedDialogTeacher
  from parlai.utils.io import PathManager
  from .build import build
label_desc: Use image node_id 2 for calling the DefaultTeacher obj's underlying member method code with example usage: obj.setup_data(path) without return types