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• W3186454526 abstract "Normalizing flows can generate complex target distributions and thus show promise in many applications in Bayesian statistics as an alternative or complement to MCMC for sampling posteriors. Since no data set from the target posterior distribution is available beforehand, the flow is typically trained using the reverse Kullback-Leibler (KL) divergence that only requires samples from a base distribution. This strategy may perform poorly when the posterior is complicated and hard to sample with an untrained normalizing flow. Here we explore a distinct training strategy, using the direct KL divergence as loss, in which samples from the posterior are generated by (i) assisting a local MCMC algorithm on the posterior with a normalizing flow to accelerate its mixing rate and (ii) using the data generated this way to train the flow. The method only requires a limited amount of textit{a~priori} input about the posterior, and can be used to estimate the evidence required for model validation, as we illustrate on examples." @default.
• W3186454526 created "2021-08-02" @default.
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• W3186454526 date "2021-07-16" @default.
• W3186454526 modified "2023-09-27" @default.
• W3186454526 title "Efficient Bayesian Sampling Using Normalizing Flows to Assist Markov Chain Monte Carlo Methods" @default.
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