old_contents: try:
      from torch.hub import load_state_dict_from_url
  except ImportError:
      from torch.utils.model_zoo import load_url as load_state_dict_from_url
  
new_contents: # Don't remove this file and don't change the imports of load_state_dict_from_url
  # from other files. We need this so that we can swap load_state_dict_from_url with
  # a custom internal version in fbcode.
  try:
      from torch.hub import load_state_dict_from_url
  except ImportError:
      from torch.utils.model_zoo import load_url as load_state_dict_from_url
  
subject: Add comments (#4072)