Search Results for author: Lisa Maria Kreusser

Found 7 papers, 0 papers with code

Closing the ODE-SDE gap in score-based diffusion models through the Fokker-Planck equation

no code implementations27 Nov 2023 Teo Deveney, Jan Stanczuk, Lisa Maria Kreusser, Chris Budd, Carola-Bibiane Schönlieb

In this paper we rigorously describe the range of dynamics and approximations that arise when training score-based diffusion models, including the true SDE dynamics, the neural approximations, the various approximate particle dynamics that result, as well as their associated Fokker--Planck equations and the neural network approximations of these Fokker--Planck equations.

Generalised Gillespie Algorithms for Simulations in a Rule-Based Epidemiological Model Framework

no code implementations17 Oct 2022 David Alonso, Steffen Bauer, Markus Kirkilionis, Lisa Maria Kreusser, Luca Sbano

These rule-based approaches are motivated by chemical reaction rules which are traditionally solved numerically with the standard Gillespie algorithm proposed in the context of molecular dynamics.

Epidemiology

Models for information propagation on graphs

no code implementations19 Jan 2022 Oliver R. A. Dunbar, Charles M. Elliott, Lisa Maria Kreusser

We propose and unify classes of different models for information propagation over graphs.

A rule-based epidemiological framework for modelling and simulation in the context of the covid-19 pandemic

no code implementations14 Nov 2021 David Alonso, Steffen Bauer, Markus Kirkilionis, Lisa Maria Kreusser, Luca Sbano

Here we stress that we do not have a specific model in mind, but a whole collection of models which can be transformed into each other, or represent different aspects of the pandemic.

Model Selection

Wasserstein GANs Work Because They Fail (to Approximate the Wasserstein Distance)

no code implementations2 Mar 2021 Jan Stanczuk, Christian Etmann, Lisa Maria Kreusser, Carola-Bibiane Schönlieb

Wasserstein GANs are based on the idea of minimising the Wasserstein distance between a real and a generated distribution.

On anisotropic diffusion equations for label propagation

no code implementations24 Jul 2020 Lisa Maria Kreusser, Marie-Therese Wolfram

In many problems in data classification one wishes to assign labels to points in a point cloud with a certain number of them being already correctly labeled.

A Deterministic Gradient-Based Approach to Avoid Saddle Points

no code implementations21 Jan 2019 Lisa Maria Kreusser, Stanley J. Osher, Bao Wang

First-order methods such as gradient descent are usually the methods of choice for training machine learning models.

BIG-bench Machine Learning

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