class_docstr: This version of SQuAD inherits from the core Dialog Teacher, which just requires it
  to define an iterator over its data `setup_data` in order to inherit basic metrics,
  a default `act` function.
  
  Note: This teacher omits the context paragraph
code: def add_cmdline_args(
      cls, parser: ParlaiParser, partial_opt: Optional[Opt] = None
  ) -> ParlaiParser:
      super().add_cmdline_args(parser, partial_opt)
      add_common_cmdline_args(parser)
      return parser
  
imports: from typing import Optional
  from parlai.core.params import ParlaiParser
  from parlai.core.opt import Opt
  from parlai.core.teachers import FixedDialogTeacher, DialogTeacher
  from parlai.utils.io import PathManager
  from .build import build
  import json
  import os
label_desc: Use image node_id 1 for calling the OpenSquadTeacher obj's underlying member method code with example usage: obj.add_cmdline_args(cls, parser, partial_opt) and returns: parser