code: def _path(opt):
      # build the data if it does not exist
      build(opt)
  
      # set up path to data (specific to each dataset)
      dt = opt["datatype"].split(":")[0]
      if ":" in opt["task"]:
          language = opt["task"].split(":")[1]
      else:
          language = "En"
      return os.path.join(
          opt["datapath"], "XPersona", language + "_" + dt + ".txt"
      )
  
imports: import copy
  import os
  from .build import build
  from parlai.core.teachers import FbDeprecatedDialogTeacher
label_desc: Use image node_id 1 for calling a global function with example usage: _path(opt) and returns: os