Radial kernels and their reproducing kernel Hilbert spaces

  • Authors:
  • Clint Scovel;Don Hush;Ingo Steinwart;James Theiler

  • Affiliations:
  • -;-;-;-

  • Venue:
  • Journal of Complexity
  • Year:
  • 2010

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Abstract

We describe how to use Schoenberg's theorem for a radial kernel combined with existing bounds on the approximation error functions for Gaussian kernels to obtain a bound on the approximation error function for the radial kernel. The result is applied to the exponential kernel and Student's kernel. To establish these results we develop a general theory regarding mixtures of kernels. We analyze the reproducing kernel Hilbert space (RKHS) of the mixture in terms of the RKHS's of the mixture components and prove a type of Jensen inequality between the approximation error function for the mixture and the approximation error functions of the mixture components.