code: def main():
      in_dir = sys.argv[1]
      out_dir = sys.argv[2]
      use_vocals = sys.argv[3] == "Y"
      utt2spk_music, utt2wav_music = prepare_music(in_dir, use_vocals)
      utt2spk_speech, utt2wav_speech = prepare_speech(in_dir)
      utt2spk_noise, utt2wav_noise = prepare_noise(in_dir)
      utt2spk = utt2spk_speech + utt2spk_music + utt2spk_noise
      utt2wav = utt2wav_speech + utt2wav_music + utt2wav_noise
      wav_fi = open(os.path.join(out_dir, "wav.scp"), "w")
      wav_fi.write(utt2wav)
      utt2spk_fi = open(os.path.join(out_dir, "utt2spk"), "w")
      utt2spk_fi.write(utt2spk)
  
imports: import os, sys
label_desc: Use image node_id 5 for calling a global function with example usage: main() without return types