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Reconstruction of a function from noisy data is often formulated as a regularized optimization problem whose solution closely matches an observed data set and also has a small reproducing kernel Hilbert space norm. The loss functions that measure agreement between the data and the function are often smooth (e.g. the least squares penalty), but non-smooth loss functions are of interest in many applications. Using the least squares penalty, large machine learning problems with kernels amenable to a stochastic state space representation (which we call

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