code: def get_video_backend():
      """
      Returns the currently active video backend used to decode videos.
  
      Returns:
          str: Name of the video backend. one of {'pyav', 'video_reader'}.
      """
  
      return _video_backend
  
file_path: vision/torchvision/__init__.py
imports: import os
  import warnings
  from modulefinder import Module
  import torch
  from torchvision import _meta_registrations, datasets, io, models, ops, transforms, utils
  from .extension import _HAS_OPS
label_desc: Use image node_id 4 for calling a global function with example usage: get_video_backend() and returns: _video_backend