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Multiple Operator-valued Kernel Learning
Hachem Kadri · Alain Rakotomamonjy · Francis Bach · philippe preux

Thu Dec 06 02:00 PM -- 12:00 AM (PST) @ Harrah’s Special Events Center 2nd Floor

Positive definite operator-valued kernels generalize the well-known notion of reproducing kernels, and are naturally adapted to multi-output learning situations. This paper addresses the problem of learning a finite linear combination of infinite-dimensional operator-valued kernels which are suitable for extending functional data analysis methods to nonlinear contexts. We study this problem in the case of kernel ridge regression for functional responses with an lr-norm constraint on the combination coefficients. The resulting optimization problem is more involved than those of multiple scalar-valued kernel learning since operator-valued kernels pose more technical and theoretical issues. We propose a multiple operator-valued kernel learning algorithm based on solving a system of linear operator equations by using a block coordinate-descent procedure. We experimentally validate our approach on a functional regression task in the context of finger movement prediction in brain-computer interfaces.

Author Information

Hachem Kadri (Aix-Marseille University)
Alain Rakotomamonjy (Université de Rouen Normandie Criteo AI Lab)
Francis Bach (INRIA - Ecole Normale Superieure)
philippe preux (INRIA)

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