code: def _check_av_available() -> None:
      if isinstance(av, Exception):
          raise av
  
file_path: lightly/lightly/api/download.py
imports: import concurrent.futures
  import os
  import pathlib
  import shutil
  import threading
  import warnings
  from concurrent.futures import ThreadPoolExecutor
  from typing import Callable, Dict, Iterable, List, Optional, Tuple, Type, Union
  import PIL
  import requests
  import tqdm
  from lightly.api import utils
label_desc: Use image node_id 1 for calling a global function with example usage: _check_av_available() without return types