Search Results for author: Nicolas Chopin

Found 10 papers, 2 papers with code

De-Sequentialized Monte Carlo: a parallel-in-time particle smoother

1 code implementation4 Feb 2022 Adrien Corenflos, Nicolas Chopin, Simo Särkkä

We propose dSMC (de-Sequentialized Monte Carlo), a new particle smoother that is able to process $T$ observations in $\mathcal{O}(\log T)$ time on parallel architecture.

Computational Doob's h-transforms for Online Filtering of Discretely Observed Diffusions

1 code implementation7 Jun 2022 Nicolas Chopin, Andras Fulop, Jeremy Heng, Alexandre H. Thiery

This paper is concerned with online filtering of discretely observed nonlinear diffusion processes.

The Poisson transform for unnormalised statistical models

no code implementations11 Jun 2014 Simon Barthelmé, Nicolas Chopin

Here we show that inferring the parameters of a unnormalised model on a space $\Omega$ can be mapped onto an equivalent problem of estimating the intensity of a Poisson point process on $\Omega$.

Bayesian matrix completion: prior specification

no code implementations5 Jun 2014 Pierre Alquier, Vincent Cottet, Nicolas Chopin, Judith Rousseau

While the behaviour of algorithms based on nuclear norm minimization is now well understood, an as yet unexplored avenue of research is the behaviour of Bayesian algorithms in this context.

Matrix Completion Recommendation Systems

PAC-Bayesian AUC classification and scoring

no code implementations NeurIPS 2014 James Ridgway, Pierre Alquier, Nicolas Chopin, Feng Liang

We also extend our method to a class of non-linear score functions, essentially leading to a nonparametric procedure, by considering a Gaussian process prior.

Classification feature selection +1

PAC-Bayesian Offline Contextual Bandits With Guarantees

no code implementations24 Oct 2022 Otmane Sakhi, Pierre Alquier, Nicolas Chopin

This paper introduces a new principled approach for off-policy learning in contextual bandits.

Generalization Bounds Multi-Armed Bandits

Fast Slate Policy Optimization: Going Beyond Plackett-Luce

no code implementations3 Aug 2023 Otmane Sakhi, David Rohde, Nicolas Chopin

We compare our method to the commonly adopted Plackett-Luce policy class and demonstrate the effectiveness of our approach on problems with action space sizes in the order of millions.

Information Retrieval Recommendation Systems +1

A connection between Tempering and Entropic Mirror Descent

no code implementations18 Oct 2023 Nicolas Chopin, Francesca R. Crucinio, Anna Korba

We establish that tempering SMC corresponds to entropic mirror descent applied to the reverse Kullback-Leibler (KL) divergence and obtain convergence rates for the tempering iterates.

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