code: def add_arguments(
      cls, parser: argparse.ArgumentParser
  ) -> argparse.ArgumentParser:
      group = parser.add_argument_group(cls.__name__)
  
      group.add_argument(
          "--audio-augmentation.standardize-channels.num-channels",
          default=2,
          type=int,
          help="Number of output audio channels. Defaults to 2.",
      )
      group.add_argument(
          "--audio-augmentation.standardize-channels.enable",
          default=False,
          action="store_true",
          help=f"Use {cls.__name__} transformation. Defaults to False.",
      )
      return parser
  
imports: import argparse
  import math
  import pathlib
  import random
  from typing import Callable, Dict, List, Optional, Union
  import torch
  import torchaudio
  from data.transforms import TRANSFORMATIONS_REGISTRY, BaseTransformation
  from data.transforms.audio_aux import mfccs
label_desc: Use image node_id 2 for calling the StandardizeChannels obj's underlying member method code with example usage: obj.add_arguments(cls, parser) and returns: parser