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 add_cmdline_args(
      cls, parser: ParlaiParser, partial_opt: Optional[Opt] = None
  ) -> ParlaiParser:
      super().add_cmdline_args(parser, partial_opt)
      agent = parser.add_argument_group("FromFile Task Arguments")
      agent.add_argument(
          "-dp", "--fromfile-datapath", type=str, help="Data file"
      )
      return parser
  
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 1 for calling the FbformatTeacher obj's underlying member method code with example usage: obj.add_cmdline_args(cls, parser, partial_opt) and returns: parser