Diffusion Generative Modelling for Divide-and-Conquer MCMC

Published in arXiv preprint, 2024

Recommended citation: Trojan, C., Fearnhead, P., and Nemeth, C. (2024). " Diffusion Generative Modelling for Divide-and-Conquer MCMC " arXiv preprint.. https://arxiv.org/abs/2406.11664

Divide-and-conquer MCMC is a strategy for parallelising Markov Chain Monte Carlo sampling by running independent samplers on disjoint subsets of a dataset and merging their output. An ongoing challenge in the literature is to efficiently perform this merging without imposing distributional assumptions on the posteriors. We propose using diffusion generative modelling to fit density approximations to the subposterior distributions. This approach outperforms existing methods on challenging merging problems, while its computational cost scales more efficiently to high dimensional problems than existing density estimation approaches.

arXiv Code