code: def check_multiwoz_folders(data_folder):
      """
      Check if the data folder actually contains the MultiWOZ dataset.
      If not, raises an error.
      Returns
      -------
      None
      Raises
      ------
      FileNotFoundError
          If the data folder doesn't contain the MultiWOZ dataset.
      """
      files_str = "/data.json"
      # Checking clips
      if not os.path.exists(data_folder + files_str):
          err_msg = (
              "the folder %s does not exist (it is expected in "
              "the MultiWOZ dataset)" % (data_folder + files_str)
          )
          raise FileNotFoundError(err_msg)
  
imports: from itertools import product
  from statistics import mean
  from typing import Any, Dict, List, Optional, Set, Tuple
  import json
  import logging
  import os
  import re
  import shutil
  from tqdm import tqdm
  from speechbrain.utils.data_utils import download_file
label_desc: Use image node_id 2 for calling a global function with example usage: check_multiwoz_folders(data_folder) without return types