code: def _main():
      args = _parse_args()
      _generate(args.num_channels, args.compression_level, args.bitrate)
  
file_path: audio/test/torchaudio_unittest/assets/io/generate_opus.py
imports: import argparse
  import subprocess
  import scipy.io.wavfile
  import torch
label_desc: Use image node_id 4 for calling a global function with example usage: _main() without return types