Deterministic Langevin Monte Carlo with Normalizing Flows for Bayesian Inference

05/27/2022

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by   Uros Seljak, et al.

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We propose a general purpose Bayesian inference algorithm for expensive likelihoods, replacing the stochastic term in the Langevin equation with a deterministic density gradient term. The particle density is evaluated from the current particle positions using a Normalizing Flow (NF), which is differentiable and has good generalization properties in high dimensions. We take advantage of NF preconditioning and NF based Metropolis-Hastings updates for a faster and unbiased convergence. We show on various examples that the method is competitive against state of the art sampling methods.