class_docstr: This task simply loads the specified file: useful for quick tests without setting up
  a new task.
class_docstr_tok: ["This","task","simply","loads","the","specified","file",":","useful","for","quick","tests","without","setting","up","a","new","task","."]
code: def __init__(self, opt, shared=None):
      opt = copy.deepcopy(opt)
      if not opt.get("fromfile_datapath"):
          raise RuntimeError("fromfile_datapath not specified")
      opt["datafile"] = opt["fromfile_datapath"]
      super().__init__(opt, shared)
  
imports: from typing import Optional
  from parlai.core.params import ParlaiParser
  from parlai.core.opt import Opt
  import copy
  import os
  import parlai.utils.logging
  from parlai.core.teachers import FbDeprecatedDialogTeacher, ParlAIDialogTeacher
label_desc: Use image node_id 2 to create a new FbformatTeacher object from inherited base classes: FbDeprecatedDialogTeacher with example: obj = FbformatTeacher(opt, shared)