@abstractmethod
    def _update_terminal_region(self, tree, terminal_regions, leaf, X, y,
                                residual, pred, sample_weight):
Add a new zero weight, corresponding to a newly added feature,
dataset/ETHPy150Open scikit-learn/scikit-learn/sklearn/ensemble/gradient_boosting.py/LossFunction._update_terminal_region--crossover with--dataset/ETHPy150Open rlpy/rlpy/rlpy/Representations/Representation.py/Representation.addNewWeight