def default_mask_targets(self):
        """The default mask targets of the underlying dataset.

        See :meth:`fiftyone.core.dataset.Dataset.default_mask_targets` for more
        information.
        """
        raise NotImplementedError(
            "Subclass must implement default_mask_targets"
        )
The default mask targets of the underlying dataset.

        See :meth:`fiftyone.core.dataset.Dataset.default_mask_targets` for more
        information.
        
fiftyone/core/collections.py