code: def _check_av_available() -> None:
      if isinstance(av, Exception):
          raise av
  
file_path: vision/torchvision/io/video.py
imports: import gc
  import math
  import os
  import re
  import warnings
  from fractions import Fraction
  from typing import Any, Dict, List, Optional, Tuple, Union
  import numpy
  import torch
  from ..utils import _log_api_usage_once
  from .None import _video_opt
label_desc: Use image node_id 1 for calling a global function with example usage: _check_av_available() without return types