code: def verify_file(path, sha256):
      
      if not os.path.isfile(path):
          return False
      digest = compute_sha256(path)
      if sha256 is None:
          # No digest supplied; report it to the console so a develop can fill
          # it in
          print('SHA-256 of {}:'.format(path))
          print('  "{}"'.format(digest))
      else:
          if digest != sha256:
              return False
      return True
docs: Verify the integrity of a file by checking its SHA-256 hash.
      If no digest is supplied, the digest is printed to the console.
  
      Closely follows the code in `torchvision.datasets.utils.check_integrity`
  
      Parameters
      ----------
      path: str
          The path of the file to check
      sha256: str
          The expected SHA-256 hex digest of the file, or `None` to print the
          digest of the file to the console
  
      Returns
      -------
      bool
          Indicates if the file passes the integrity check or not