code: def check_commonvoice_folders(data_folder):
      """
      Check if the data folder actually contains the Common Voice dataset.
      If not, raises an error.
      Returns
      -------
      None
      Raises
      ------
      FileNotFoundError
          If data folder doesn't contain Common Voice dataset.
      """
      files_str = "/clips"
      # Checking clips
      if not os.path.exists(data_folder + files_str):
          err_msg = (
              "the folder %s does not exist (it is expected in "
              "the Common Voice dataset)" % (data_folder + files_str)
          )
          raise FileNotFoundError(err_msg)
  
file_path: speechbrain/recipes/CommonVoice/ASR/seq2seq/common_voice_prepare.py
imports: from dataclasses import dataclass
  import os
  import csv
  import re
  import logging
  import torchaudio
  import unicodedata
  import functools
  from speechbrain.utils.parallel import parallel_map
  from speechbrain.dataio.dataio import read_audio_info
label_desc: Use image node_id 6 for calling a global function with example usage: check_commonvoice_folders(data_folder) without return types