1 code implementation • 29 Jun 2023 • Ferdia Sherry, Elena Celledoni, Matthias J. Ehrhardt, Davide Murari, Brynjulf Owren, Carola-Bibiane Schönlieb
Motivated by classical work on the numerical integration of ordinary differential equations we present a ResNet-styled neural network architecture that encodes non-expansive (1-Lipschitz) operators, as long as the spectral norms of the weights are appropriately constrained.
1 code implementation • 6 Jun 2023 • Håkon Noren, Sølve Eidnes, Elena Celledoni
We introduce the mean inverse integrator (MII), a novel approach to increase the accuracy when training neural networks to approximate vector fields of dynamical systems from noisy data.
no code implementations • 1 May 2023 • Elena Celledoni, James Jackaman, Davide Murari, Brynjulf Owren
Neural networks are the state-of-the-art for many approximation tasks in high-dimensional spaces, as supported by an abundance of experimental evidence.
1 code implementation • 5 Oct 2022 • Elena Celledoni, Davide Murari, Brynjulf Owren, Carola-Bibiane Schönlieb, Ferdia Sherry
The structure of the neural network is then inferred from the properties of the ODE vector field.
1 code implementation • 22 Jul 2022 • Elena Celledoni, Helge Glöckner, Jørgen Riseth, Alexander Schmeding
One of the fundamental problems in shape analysis is to align curves or surfaces before computing geodesic distances between their shapes.
1 code implementation • 31 Jan 2022 • Elena Celledoni, Andrea Leone, Davide Murari, Brynjulf Owren
Recently, there has been an increasing interest in modelling and computation of physical systems with neural networks.
no code implementations • 25 Feb 2021 • Elena Celledoni, Ergys Çokaj, Andrea Leone, Davide Murari, Brynjulf Owren
Finally, we show how Lie group integrators can be applied to model the controlled path of a payload being transported by two rotors.
Image Registration Numerical Analysis Numerical Analysis Dynamical Systems 65L05, 70E55
1 code implementation • 23 Feb 2021 • Elena Celledoni, Matthias J. Ehrhardt, Christian Etmann, Brynjulf Owren, Carola-Bibiane Schönlieb, Ferdia Sherry
In this work, we demonstrate that group equivariant convolutional operations can naturally be incorporated into learned reconstruction methods for inverse problems that are motivated by the variational regularisation approach.
no code implementations • 21 Dec 2020 • Helge I. Andersson, Elena Celledoni, Laurel Ohm, Brynjulf Owren, Benjamin K. Tapley
We propose a novel integral model describing the motion of curved slender fibers in viscous flow, and develop a numerical method for simulating dynamics of rigid fibers.
Fluid Dynamics Numerical Analysis Numerical Analysis
no code implementations • 5 Jun 2020 • Elena Celledoni, Matthias J. Ehrhardt, Christian Etmann, Robert I McLachlan, Brynjulf Owren, Carola-Bibiane Schönlieb, Ferdia Sherry
Over the past few years, deep learning has risen to the foreground as a topic of massive interest, mainly as a result of successes obtained in solving large-scale image processing tasks.
no code implementations • 14 Jun 2019 • Elena Celledoni, Pål Erik Lystad, Nikolas Tapia
Signatures provide a succinct description of certain features of paths in a reparametrization invariant way.
no code implementations • 11 Apr 2019 • Martin Benning, Elena Celledoni, Matthias J. Ehrhardt, Brynjulf Owren, Carola-Bibiane Schönlieb
We review the first order conditions for optimality, and the conditions ensuring optimality after discretisation.