Search Results for author: Tony Lelièvre

Found 6 papers, 1 papers with code

Generative methods for sampling transition paths in molecular dynamics

no code implementations5 May 2022 Tony Lelièvre, Geneviève Robin, Inass Sekkat, Gabriel Stoltz, Gabriel Victorino Cardoso

Molecular systems often remain trapped for long times around some local minimum of the potential energy function, before switching to another one -- a behavior known as metastability.

reinforcement-learning Reinforcement Learning (RL)

Chasing Collective Variables using Autoencoders and biased trajectories

no code implementations22 Apr 2021 Zineb Belkacemi, Paraskevi Gkeka, Tony Lelièvre, Gabriel Stoltz

In this context, approaches where the CVs are learned in an iterative way using adaptive biasing have been proposed: at each iteration, the learned CV is used to perform free energy adaptive biasing to generate new data and learn a new CV.

BIG-bench Machine Learning Dimensionality Reduction

Quasi-stationary distribution for the Langevin process in cylindrical domains, part I: existence, uniqueness and long-time convergence

no code implementations28 Jan 2021 Tony Lelièvre, Mouad Ramil, Julien Reygner

Consider the Langevin process, described by a vector (position, momentum) in $\mathbb{R}^{d}\times\mathbb{R}^d$.

Probability Spectral Theory

The exit from a metastable state: concentration of the exit point distribution on the low energy saddle points, part 2

no code implementations15 Dec 2020 Tony Lelièvre, Dorian Le Peutrec, Boris Nectoux

We consider the first exit point distribution from a bounded domain $\Omega$ of the stochastic process $(X_t)_{t\ge 0}$ solution to the overdamped Langevin dynamics $$d X_t = -\nabla f(X_t) d t + \sqrt{h} \ d B_t$$ starting from deterministic initial conditions in $\Omega$, under rather general assumptions on $f$ (for instance, $f$ may have several critical points in $\Omega$).

Analysis of PDEs Mathematical Physics Mathematical Physics Probability

A new implementation of the Generalized Parallel Replica dynamics for the long time simulation of metastable biochemical systems

2 code implementations6 Jul 2018 Florent Hédin, Tony Lelièvre

Metastability is one of the major encountered obstacle when performing long molecular dynamics simulations, and many methods were developed to address this challenge.

Chemical Physics Computational Physics

Hybrid Monte Carlo methods for sampling probability measures on submanifolds

no code implementations6 Jul 2018 Tony Lelièvre, Mathias Rousset, Gabriel Stoltz

In order to avoid biases in the invariant probability measures sampled by discretizations of these stochastically perturbed Hamiltonian dynamics, a Metropolis rejection procedure can be considered.

Numerical Analysis Numerical Analysis 65P10, 65C40, 82-08

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