Optimal quantisation of probability measures using maximum mean discrepancy

O Teymur, J Gorham, M Riabiz… - … Conference on Artificial …, 2021 - proceedings.mlr.press
International Conference on Artificial Intelligence and Statistics, 2021proceedings.mlr.press
Several researchers have proposed minimisation of maximum mean discrepancy (MMD) as
a method to quantise probability measures, ie, to approximate a distribution by a
representative point set. We consider sequential algorithms that greedily minimise MMD
over a discrete candidate set. We propose a novel non-myopic algorithm and, in order to
both improve statistical efficiency and reduce computational cost, we investigate a variant
that applies this technique to a mini-batch of the candidate set at each iteration. When the …
Abstract
Several researchers have proposed minimisation of maximum mean discrepancy (MMD) as a method to quantise probability measures, ie, to approximate a distribution by a representative point set. We consider sequential algorithms that greedily minimise MMD over a discrete candidate set. We propose a novel non-myopic algorithm and, in order to both improve statistical efficiency and reduce computational cost, we investigate a variant that applies this technique to a mini-batch of the candidate set at each iteration. When the candidate points are sampled from the target, the consistency of these new algorithms—and their mini-batch variants—is established. We demonstrate the algorithms on a range of important computational problems, including optimisation of nodes in Bayesian cubature and the thinning of Markov chain output.
proceedings.mlr.press
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