Search Results for author: Leon Bungert

Found 15 papers, 8 papers with code

A mean curvature flow arising in adversarial training

no code implementations22 Apr 2024 Leon Bungert, Tim Laux, Kerrek Stinson

We connect adversarial training for binary classification to a geometric evolution equation for the decision boundary.

It begins with a boundary: A geometric view on probabilistically robust learning

1 code implementation30 May 2023 Leon Bungert, Nicolás García Trillos, Matt Jacobs, Daniel Mckenzie, Đorđe Nikolić, Qingsong Wang

Although deep neural networks have achieved super-human performance on many classification tasks, they often exhibit a worrying lack of robustness towards adversarially generated examples.

Gamma-convergence of a nonlocal perimeter arising in adversarial machine learning

no code implementations28 Nov 2022 Leon Bungert, Kerrek Stinson

In this paper we prove Gamma-convergence of a nonlocal perimeter of Minkowski type to a local anisotropic perimeter.

The Geometry of Adversarial Training in Binary Classification

no code implementations26 Nov 2021 Leon Bungert, Nicolás García Trillos, Ryan Murray

We establish an equivalence between a family of adversarial training problems for non-parametric binary classification and a family of regularized risk minimization problems where the regularizer is a nonlocal perimeter functional.

Binary Classification Classification

Uniform Convergence Rates for Lipschitz Learning on Graphs

1 code implementation24 Nov 2021 Leon Bungert, Jeff Calder, Tim Roith

In this work we prove uniform convergence rates for solutions of the graph infinity Laplace equation as the number of vertices grows to infinity.

Neural Architecture Search via Bregman Iterations

1 code implementation4 Jun 2021 Leon Bungert, Tim Roith, Daniel Tenbrinck, Martin Burger

We propose a novel strategy for Neural Architecture Search (NAS) based on Bregman iterations.

Deblurring Denoising +1

A Bregman Learning Framework for Sparse Neural Networks

1 code implementation10 May 2021 Leon Bungert, Tim Roith, Daniel Tenbrinck, Martin Burger

In contrast to established methods for sparse training the proposed family of algorithms constitutes a regrowth strategy for neural networks that is solely optimization-based without additional heuristics.

Denoising Image Classification

CLIP: Cheap Lipschitz Training of Neural Networks

1 code implementation23 Mar 2021 Leon Bungert, René Raab, Tim Roith, Leo Schwinn, Daniel Tenbrinck

Despite the large success of deep neural networks (DNN) in recent years, most neural networks still lack mathematical guarantees in terms of stability.

Identifying Untrustworthy Predictions in Neural Networks by Geometric Gradient Analysis

1 code implementation24 Feb 2021 Leo Schwinn, An Nguyen, René Raab, Leon Bungert, Daniel Tenbrinck, Dario Zanca, Martin Burger, Bjoern Eskofier

The susceptibility of deep neural networks to untrustworthy predictions, including out-of-distribution (OOD) data and adversarial examples, still prevent their widespread use in safety-critical applications.

Continuum Limit of Lipschitz Learning on Graphs

no code implementations7 Dec 2020 Tim Roith, Leon Bungert

In particular, we define a sequence of functionals which approximate the largest local Lipschitz constant of a graph function and prove $\Gamma$-convergence in the $L^\infty$-topology to the supremum norm of the gradient as the graph becomes denser.

Variational regularisation for inverse problems with imperfect forward operators and general noise models

no code implementations28 May 2020 Leon Bungert, Martin Burger, Yury Korolev, Carola-Bibiane Schoenlieb

We study variational regularisation methods for inverse problems with imperfect forward operators whose errors can be modelled by order intervals in a partial order of a Banach lattice.

Numerical Analysis Numerical Analysis Optimization and Control 47A52, 65J20, 65J22, 65K10

Robust Image Reconstruction with Misaligned Structural Information

1 code implementation1 Apr 2020 Leon Bungert, Matthias J. Ehrhardt

Multi-modality (or multi-channel) imaging is becoming increasingly important and more widely available, e. g. hyperspectral imaging in remote sensing, spectral CT in material sciences as well as multi-contrast MRI and PET-MR in medicine.

Image Reconstruction

Computing Nonlinear Eigenfunctions via Gradient Flow Extinction

no code implementations27 Feb 2019 Leon Bungert, Martin Burger, Daniel Tenbrinck

In this work we investigate the computation of nonlinear eigenfunctions via the extinction profiles of gradient flows.

BIG-bench Machine Learning Clustering +2

Blind Image Fusion for Hyperspectral Imaging with the Directional Total Variation

2 code implementations4 Oct 2017 Leon Bungert, David A. Coomes, Matthias J. Ehrhardt, Jennifer Rasch, Rafael Reisenhofer, Carola-Bibiane Schönlieb

In this paper, we propose a method for increasing the spatial resolution of a hyperspectral image by fusing it with an image of higher spatial resolution that was obtained with a different imaging modality.

Blind Super-Resolution Super-Resolution

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