Abstract
This paper gives sharp rates of convergence for natural versions of the Metropolis algorithm for sampling from the uniform distribution on a convex polytope. The singular proposal distribution, based on a walk moving locally in one of a fixed, finite set of directions, needs some new tools. We get useful bounds on the spectrum and eigenfunctions using Nash and Weyl-type inequalities. The top eigenvalues of the Markov chain are closely related to the Neumann eigenvalues of the polytope for a novel Laplacian.
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Persi Diaconis: Supported in part by NSF grant 0804324.
Gilles Lebeau: Supported in part by ANR-06-BLAN-0250-03.
Laurent Michel: Supported in part by ANR-06-BLAN-0250-03 and ANR-09-JCJC-0099-01.
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Diaconis, P., Lebeau, G. & Michel, L. Gibbs/Metropolis algorithms on a convex polytope. Math. Z. 272, 109–129 (2012). https://doi.org/10.1007/s00209-011-0924-5
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DOI: https://doi.org/10.1007/s00209-011-0924-5