def _verify_all_labels_masked(self):
        """
        Verify that every point in the pointcloud is associated with a label.
        If any one point is not covered by a label, then raise a
        ``ValueError``.
        """
        # values is a generator in Python 3, so convert to list
        labels_values = list(self._labels_to_masks.values())
        unlabelled_points = np.sum(labels_values, axis=0) <= 0
        if np.any(unlabelled_points):
            nonzero = np.nonzero(unlabelled_points)
            raise ValueError(
                'Every point in the landmark pointcloud must be labelled. '
                'Points {0} were unlabelled.'.format(nonzero))
dataset/ETHPy150Open menpo/menpo/menpo/landmark/base.py/LandmarkGroup._verify_all_labels_masked/operator `==` -> `<=`