code: def setup_helper(self, jsons_path):
      if self.opt["datatype"].startswith("test"):
          dpath = os.path.join(jsons_path, "test.json")
      elif self.opt["datatype"].startswith("valid"):
          dpath = os.path.join(jsons_path, "dev.json")
      elif self.opt["datatype"].startswith("train"):
          dpath = os.path.join(jsons_path, "train.json")
      else:
          raise ValueError("Datatype not train, test, or valid")
      episodes = []
      with PathManager.open(dpath) as f:
          data = json.load(f)
          for dialogue in data:
              context = "\n".join(dialogue[0])
              qas = dialogue[1]
              episodes.append({"context": context, "qas": qas})
      return episodes
  
file_path: ParlAI/parlai/tasks/dream/agents.py
imports: from parlai.core.teachers import FixedDialogTeacher
  from parlai.utils.io import PathManager
  from .build import build
  import os
  import json
label_desc: Use image node_id 4 for calling the DREAMTeacher obj's underlying member method code with example usage: obj.setup_helper(jsons_path) and returns: episodes