def invert(self, X):
        raise NotImplementedError(str(type(self))+" does not implement an invert method.")
List Keystone Groups.
dataset/ETHPy150Open hycis/Mozi/mozi/datasets/preprocessor.py/Preprocessor.invert--crossover with--dataset/ETHPy150Open openstack-infra/shade/shade/operatorcloud.py/OperatorCloud.list_groups