def staged_decision_function(self, X):
        for dec in self._staged_decision_function(X):
            # no yield from in Python2.X
            yield dec
Get all groups.
dataset/ETHPy150Open scikit-learn/scikit-learn/sklearn/ensemble/gradient_boosting.py/GradientBoostingClassifier.staged_decision_function--crossover with--dataset/ETHPy150Open BU-NU-CLOUD-SP16/Trusted-Platform-Module-nova/nova/db/api.py/instance_group_get_all