Consensus-based sampling

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• Urbain Vaes (INRIA, ENPC - École des Ponts ParisTech, INRIA Paris - Rocquencourt)
• Friday 29 April 2022, 12:15-13:15
• Seminar Room 1, Newton Institute.

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FKTW03 - Frontiers in kinetic equations for plasmas and collective behaviour

In the first part of this talk, I will present background material on Bayesian inverse problems, the associated challenges at the numerical level, and gradient-free sampling and optimization approaches for solving them.  In the second part, I will present recent work [1] on a novel gradient-free sampling method that is well suited for Bayesian inverse problems. The method is inspired by consensus-based methods in optimization and based on a stochastic interacting particle system. We demonstrate its potential in regimes where the target distribution is unimodal and close to Gaussian; indeed we prove that it enables to recover a Laplace approximation of the measure in certain parametric regimes and provide numerical evidence that this Laplace approximation attracts a large set of initial conditions in a number of examples.     [1] https://arxiv.org/abs/2106.02519

This talk is part of the Isaac Newton Institute Seminar Series series.

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