code: def get_parser():
      parser = argparse.ArgumentParser(
          description="Apply mean-variance normalization to files",
          formatter_class=argparse.ArgumentDefaultsHelpFormatter,
      )
  
      parser.add_argument(
          "--norm_means",
          type=bool,
          default=True,
          help="Do mean normalization or not.",
      )
      parser.add_argument(
          "--norm_vars",
          type=bool,
          default=False,
          help="Do variance normalization or not.",
      )
      parser.add_argument(
          "--reverse",
          type=bool,
          default=False,
          help="Do reverse mode or not",
      )
      parser.add_argument(
          "--std_floor",
          type=float,
          default=1e-20,
          help="The std floor of norm_vars",
      )
      parser.add_argument(
          "--spk2utt",
          type=str,
          help="A text file of speaker to utterance-list map. "
          '(Don\'t give rspecifier format, such as "ark:spk2utt")',
      )
      parser.add_argument(
          "--utt2spk",
          type=str,
          help="A text file of utterance to speaker map. "
          '(Don\'t give rspecifier format, such as "ark:utt2spk")',
      )
      parser.add_argument(
          "--write_num_frames",
          type=str,
          help="Specify wspecifer for utt2num_frames",
      )
      parser.add_argument(
          "--compress",
          type=bool,
          default=False,
          help="Save data in compressed format",
      )
      parser.add_argument(
          "--compression_method",
          type=int,
          default=2,
          help="Specify the method of compression",
      )
      parser.add_argument(
          "--verbose", "-V", default=0, type=int, help="Verbose option"
      )
      parser.add_argument(
          "stats_rspecifier_or_rxfilename",
          help="Input stats. e.g. ark:stats.ark or stats.ark",
      )
      parser.add_argument(
          "rspecifier",
          type=str,
          help="Read specifier id. e.g. scp:some.scp",
      )
      parser.add_argument(
          "wspecifier",
          type=str,
          help="Write specifier id. e.g. ark:some.ark",
      )
  
      return parser
  
file_path: delta/egs/iemocap/emo/v1/utils/speech/apply_cmvn.py
imports: import argparse
  import kaldiio
  import numpy
  from espnet.utils.cli_writers import KaldiWriter
  from espnet.utils.cli_readers import KaldiReader
  import os
  from delta.data.frontend.cmvn import CMVN
label_desc: Use image node_id 1 for calling a global function with example usage: get_parser() and returns: parser