code: def _path(self, opt):
      build(opt)
      dt = opt["datatype"].split(":")[0]
      return os.path.join(self.datapath, dt + ".json")
  
file_path: ParlAI/parlai/tasks/mwsc/agents.py
imports: from parlai.core.teachers import DialogTeacher
  from parlai.utils.io import PathManager
  from .build import build
  import os
  import json
label_desc: Use image node_id 2 for calling the MWSCTeacher obj's underlying member method code with example usage: obj._path(opt) and returns: os