def without_labels(self, labels):
        # Make it easier to use by accepting a single string as well as a list
        if isinstance(labels, str):
            labels = [labels]
        labels_to_keep = list(set(self.labels).difference(labels))
        return self._new_group_with_only_labels(labels_to_keep)
Relative error between `expected` and `actual`: ``abs((a - e)/e)``.
dataset/ETHPy150Open menpo/menpo/menpo/landmark/base.py/LandmarkGroup.without_labels--crossover with--dataset/ETHPy150Open probcomp/bayeslite/src/math_util.py/relerr