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• W3037234540 abstract "We develop and analyze a projected particle Langevin optimization method to learn the distribution in the Schonberg integral representation of the radial basis functions from training samples. More specifically, we characterize a distributionally robust optimization method with respect to the Wasserstein distance to optimize the distribution in the Schonberg integral representation. To provide theoretical performance guarantees, we analyze the scaling limits of a projected particle online (stochastic) optimization method in the mean-field regime. In particular, we prove that in the scaling limits, the empirical measure of the Langevin particles converges to the law of a reflected Ito diffusion-drift process. Moreover, the drift is also a function of the law of the underlying process. Using Ito lemma for semi-martingales and Grisanov's change of measure for the Wiener processes, we then derive a Mckean-Vlasov type partial differential equation (PDE) with Robin boundary conditions that describes the evolution of the empirical measure of the projected Langevin particles in the mean-field regime. In addition, we establish the existence and uniqueness of the steady-state solutions of the derived PDE in the weak sense. We apply our learning approach to train radial kernels in the kernel locally sensitive hash (LSH) functions, where the training data-set is generated via a $k$-mean clustering method on a small subset of data-base. We subsequently apply our kernel LSH with a trained kernel for image retrieval task on MNIST data-set, and demonstrate the efficacy of our kernel learning approach. We also apply our kernel learning approach in conjunction with the kernel support vector machines (SVMs) for classification of benchmark data-sets." @default.
• W3037234540 created "2020-07-02" @default.
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• W3037234540 date "2020-06-23" @default.
• W3037234540 modified "2023-09-27" @default.
• W3037234540 title "A Mean-Field Theory for Learning the Schönberg Measure of Radial Basis Functions." @default.
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• W3037234540 hasPublicationYear "2020" @default.
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