code: def add_core_args(self):
      self.parser.add_argument_group("Core Arguments")
      # TODO: Add Help flag here describing MMF Configuration
      # and point to configuration documentation
      self.parser.add_argument(
          "-co",
          "--config_override",
          type=str,
          default=None,
          help="Use to override config from command line directly",
      )
      # This is needed to support torch.distributed.launch
      self.parser.add_argument(
          "--local_rank",
          type=int,
          default=None,
          help="Local rank of the argument",
      )
      self.parser.add_argument(
          "opts",
          default=None,
          nargs=argparse.REMAINDER,
          help="Modify config options from command line",
      )
  
imports: import argparse
label_desc: Use image node_id 3 for calling the Flags obj's underlying member method code with example usage: obj.add_core_args() without return types