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We develop a PAC-Bayesian bound for the convergence rate of a Bayesian variant of Multiple Kernel Learning (MKL) that is an estimation method for the sparse additive model. Standard analyses for MKL require a strong condition on the design analogous to the restricted eigenvalue condition for the analysis of Lasso and Dantzig selector. In this paper, we apply PAC-Bayesian technique to show that the Bayesian variant of MKL achieves the optimal convergence rate without such strong conditions on the design. Basically our approach is a combination of PAC-Bayes and recently developed theories of non-parametric Gaussian process regressions. Our bound is developed in a fixed design situation. Our analysis includes the existing result of Gaussian process as a special case and the proof is much simpler by virtue of PAC-Bayesian technique. We also give the convergence rate of the Bayesian variant of Group Lasso as a finite dimensional special case.
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