def kl(self, Y, Y_hat):
        batch_axis = self.output_space.get_batch_axis()
        div = kl(Y=Y, Y_hat=Y_hat, batch_axis=batch_axis)
        return div
Calculate the error in q space.
dataset/ETHPy150Open lisa-lab/pylearn2/pylearn2/models/mlp.py/Sigmoid.kl--crossover with--dataset/ETHPy150Open scikit-beam/scikit-beam/skbeam/core/cdi.py/cal_diff_error