Search Results for author: Lorenz Richter

Found 11 papers, 7 papers with code

Fast and Unified Path Gradient Estimators for Normalizing Flows

no code implementations23 Mar 2024 Lorenz Vaitl, Ludwig Winkler, Lorenz Richter, Pan Kessel

Recent work shows that path gradient estimators for normalizing flows have lower variance compared to standard estimators for variational inference, resulting in improved training.

Computational Efficiency Variational Inference

From continuous-time formulations to discretization schemes: tensor trains and robust regression for BSDEs and parabolic PDEs

1 code implementation28 Jul 2023 Lorenz Richter, Leon Sallandt, Nikolas Nüsken

The numerical approximation of partial differential equations (PDEs) poses formidable challenges in high dimensions since classical grid-based methods suffer from the so-called curse of dimensionality.

Computational Efficiency

Transgressing the boundaries: towards a rigorous understanding of deep learning and its (non-)robustness

no code implementations5 Jul 2023 Carsten Hartmann, Lorenz Richter

Nevertheless, it is evident that certain specifics of DL that could explain its success in applications demands systematic mathematical approaches.

Adversarial Robustness Learning Theory +3

Improved sampling via learned diffusions

1 code implementation3 Jul 2023 Lorenz Richter, Julius Berner, Guan-Horng Liu

Recently, a series of papers proposed deep learning-based approaches to sample from unnormalized target densities using controlled diffusion processes.

An optimal control perspective on diffusion-based generative modeling

1 code implementation2 Nov 2022 Julius Berner, Lorenz Richter, Karen Ullrich

In particular, we derive a Hamilton-Jacobi-Bellman equation that governs the evolution of the log-densities of the underlying SDE marginals.

Robust SDE-Based Variational Formulations for Solving Linear PDEs via Deep Learning

1 code implementation21 Jun 2022 Lorenz Richter, Julius Berner

The combination of Monte Carlo methods and deep learning has recently led to efficient algorithms for solving partial differential equations (PDEs) in high dimensions.

Interpolating between BSDEs and PINNs: deep learning for elliptic and parabolic boundary value problems

no code implementations7 Dec 2021 Nikolas Nüsken, Lorenz Richter

Solving high-dimensional partial differential equations is a recurrent challenge in economics, science and engineering.

VarGrad: A Low-Variance Gradient Estimator for Variational Inference

1 code implementation NeurIPS 2020 Lorenz Richter, Ayman Boustati, Nikolas Nüsken, Francisco J. R. Ruiz, Ömer Deniz Akyildiz

We analyse the properties of an unbiased gradient estimator of the ELBO for variational inference, based on the score function method with leave-one-out control variates.

Variational Inference

Solving high-dimensional Hamilton-Jacobi-Bellman PDEs using neural networks: perspectives from the theory of controlled diffusions and measures on path space

no code implementations11 May 2020 Nikolas Nüsken, Lorenz Richter

Optimal control of diffusion processes is intimately connected to the problem of solving certain Hamilton-Jacobi-Bellman equations.

Variational approach to rare event simulation using least-squares regression

1 code implementation26 Jan 2019 Carsten Hartmann, Omar Kebiri, Lara Neureither, Lorenz Richter

We propose an adaptive importance sampling scheme for the simulation of rare events when the underlying dynamics is given by a diffusion.

Probability Optimization and Control 65C05 (primary), 65C30, 92C40 (secondary)

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