code: def ensure_imagenet_manual_download(source_dir, split, devkit=False):
      """Ensures that the ImageNet archive(s) for the requested split have been
      manually downloaded to the required locations.
  
      Args:
          source_dir: the dataset directory
          split: the split of interest. Supported values are
              ``("train", "validation")``
          devkit (False): whether to ensure that the devkit archive is present
  
      Raises:
          OSError: if the required files are not present
      """
      if split == "train":
          archive_name = _TRAIN_IMAGES_TAR
      elif split == "validation":
          archive_name = _VAL_IMAGES_DIR
      else:
          raise ValueError(
              "Unsupported split '%s'; Supported values are "
              "('train', 'validation')"
          )
  
      _ensure_archive(archive_name, source_dir)
  
      if devkit:
          devkit_name = _DEVKIT_TAR
          _ensure_archive(devkit_name, source_dir)
  
label_desc: Use image node_id 1 for calling a global function with example usage: ensure_imagenet_manual_download(source_dir, split, devkit) without return types