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Stein Variational Adaptive Importance Sampling
Proceedings of the 33rd Conference on Uncertainty in Artificial Intelligence, PMLR R15:711-720, 2017.
Abstract
We propose a novel adaptive importance sam- pling algorithm which incorporates Stein vari- ational gradient decent algorithm (SVGD) with importance sampling (IS). Our algorithm lever- ages the nonparametric transforms in SVGD to iteratively decrease the KL divergence between importance proposals and target distributions. The advantages of our algorithm are twofold: 1) it turns SVGD into a standard IS algorithm, al- lowing us to use standard diagnostic and ana- lytic tools of IS to evaluate and interpret the re- sults, and 2) it does not restrict the choice of the importance proposals to predefined distribu- tion families like traditional (adaptive) IS meth- ods. Empirical experiments demonstrate that our algorithm performs well on evaluating partition functions of restricted Boltzmann machines and testing likelihood of variational auto-encoders.