def _patch_if_necessary(self, dataset_dir, split):
        """Internal method called when an already downloaded dataset may need
        to be patched.

        Args:
            dataset_dir: the directory containing the dataset
            split: the split to patch, or None if the dataset does not have
                splits
        """
        raise NotImplementedError(
            "subclasses must implement _patch_if_necessary()"
        )
Internal method called when an already downloaded dataset may need
        to be patched.

        Args:
            dataset_dir: the directory containing the dataset
            split: the split to patch, or None if the dataset does not have
                splits
        
fiftyone/zoo/datasets/__init__.py