def gradients_X_diag(self, dL_dKdiag, X):
        raise NotImplementedError
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dataset/ETHPy150Open SheffieldML/GPy/GPy/kern/src/kern.py/Kern.gradients_X_diag--crossover with--dataset/ETHPy150Open SheffieldML/GPy/GPy/util/datasets.py/prompt_user