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("FlipLabelMutator args")
      agent.add_argument(
          "--noise-level",
          type=float,
          help="The probability of label flipping",
      )
      agent.add_argument(
          "--classification-label-to-mutate",
          default="__ok__,__notok__",
          type=str,
          help="The binary labels in the data for flipping / random assignment. seprated by ,",
      )
      return parser
  
imports: from typing import Optional
  from parlai.core.message import Message
  from parlai.core.mutators import MessageMutator, register_mutator
  from parlai.core.opt import Opt
  from parlai.core.params import ParlaiParser
  from parlai.utils.data import DatatypeHelper
  import hashlib
  import parlai.utils.logging
  import copy
label_desc: Use image node_id 1 for calling the FlipClassificationLabelMutator obj's underlying member method code with example usage: obj.add_cmdline_args(cls, parser, partial_opt) and returns: parser