code: def add_cmdline_args(
      cls, parser: ParlaiParser, partial_opt: Optional[Opt] = None
  ) -> ParlaiParser:
      group = parser.add_argument_group("RepeatLabel Arguments")
      group.add_argument(
          "--return_one_random_answer",
          type="bool",
          default=True,
          help="return one answer from the set of labels",
      )
      group.add_argument(
          "--cant_answer_percent",
          type=float,
          default=0,
          help="set value in range[0,1] to set chance of "
          "replying with special message",
      )
      group.add_argument(
          "--cant_answer_message",
          type=str,
          default="I don't know.",
          help="Message sent when the model cannot answer",
      )
      return parser
  
file_path: ParlAI/parlai/agents/repeat_label/repeat_label.py
imports: from typing import Optional
  from parlai.core.params import ParlaiParser
  from parlai.core.opt import Opt
  import random
  from parlai.core.agents import Agent
  from parlai.core.message import Message
label_desc: Use image node_id 1 for calling the RepeatLabelAgent obj's underlying member method code with example usage: obj.add_cmdline_args(cls, parser, partial_opt) and returns: parser