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Likelihood-free MCMC with Amortized Approximate Ratio Estimators
Hermans, Joeri; Begy, Volodimir; Louppe, Gilles
2020In Proceedings of the 37th International Conference on Machine Learning
Peer reviewed
 

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Abstract :
[en] Posterior inference with an intractable likelihood is becoming an increasingly common task in scientific domains which rely on sophisticated computer simulations. Typically, these forward models do not admit tractable densities forcing practitioners to rely on approximations. This work introduces a novel approach to address the intractability of the likelihood and the marginal model. We achieve this by learning a flexible amortized estimator which approximates the likelihood-to-evidence ratio. We demonstrate that the learned ratio estimator can be embedded in \textsc{mcmc} samplers to approximate likelihood-ratios between consecutive states in the Markov chain, allowing us to draw samples from the intractable posterior. Techniques are presented to improve the numerical stability and to measure the quality of an approximation. The accuracy of our approach is demonstrated on a variety of benchmarks against well-established techniques. Scientific applications in physics show its applicability.
Disciplines :
Computer science
Author, co-author :
Hermans, Joeri ;  Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Big Data
Begy, Volodimir
Louppe, Gilles  ;  Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Big Data
Language :
English
Title :
Likelihood-free MCMC with Amortized Approximate Ratio Estimators
Publication date :
July 2020
Event name :
37th International Conference on Machine Learning
Event date :
July 13-18, 2020
Audience :
International
Main work title :
Proceedings of the 37th International Conference on Machine Learning
Pages :
4239-4248
Peer reviewed :
Peer reviewed
Available on ORBi :
since 22 May 2019

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