code: def check_voicebank_folders(*folders):
      """Raises FileNotFoundError if any passed folder does not exist."""
      for folder in folders:
          if not os.path.exists(folder):
              raise FileNotFoundError(
                  f"the folder {folder} does not exist (it is expected in "
                  "the Voicebank dataset)"
              )
  
file_path: speechbrain/recipes/Voicebank/dereverb/MetricGAN-U/voicebank_revb_prepare.py
imports: import os
  import json
  import string
  import logging
  from speechbrain.utils.data_utils import get_all_files
  from speechbrain.dataio.dataio import read_audio
label_desc: Use image node_id 5 for calling a global function with example usage: check_voicebank_folders() without return types