class_docstr: Override to only return one side of the conversation.
class_docstr_tok: ["Override","to","only","return","one","side","of","the","conversation","."]
code: def add_cmdline_args(
      cls, parser: ParlaiParser, partial_opt: Optional[Opt] = None
  ) -> ParlaiParser:
      super().add_cmdline_args(parser, partial_opt=partial_opt)
      agent = parser.add_argument_group("IGCResponseOnly Arguments")
      agent.add_argument(
          "--igc-multi-ref",
          type="bool",
          default=False,
          help="specify true to evaluate on multi-reference labels",
      )
      return parser
  
imports: from typing import Optional
  from parlai.core.params import ParlaiParser
  import csv
  import os
  from abc import ABC, abstractmethod
  from PIL import Image
  from typing import List, Dict, Any
  from parlai.core.build_data import download_multiprocess
  from parlai.core.params import Opt
  from parlai.core.teachers import AbstractImageTeacher
  from parlai.utils.io import PathManager
  import parlai.utils.typing
label_desc: Use image node_id 1 for calling the IGCOneSideTeacher obj's underlying member method code with example usage: obj.add_cmdline_args(cls, parser, partial_opt) and returns: parser