Search Results for author: Elena Celledoni

Found 12 papers, 6 papers with code

Designing Stable Neural Networks using Convex Analysis and ODEs

1 code implementation29 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.

Deblurring Image Classification +2

Learning Dynamical Systems from Noisy Data with Inverse-Explicit Integrators

1 code implementation6 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.

Predictions Based on Pixel Data: Insights from PDEs and Finite Differences

no code implementations1 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.

Dynamical systems' based neural networks

1 code implementation5 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.

Deep neural networks on diffeomorphism groups for optimal shape reparameterization

1 code implementation22 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.

Learning Hamiltonians of constrained mechanical systems

1 code implementation31 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.

Lie Group integrators for mechanical systems

no code implementations25 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

Equivariant neural networks for inverse problems

1 code implementation23 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.

Inductive Bias

An integral model based on slender body theory, with applications to curved rigid fibers

no code implementations21 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

Structure preserving deep learning

no code implementations5 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.

Signatures in Shape Analysis: an Efficient Approach to Motion Identification

no code implementations14 Jun 2019 Elena Celledoni, Pål Erik Lystad, Nikolas Tapia

Signatures provide a succinct description of certain features of paths in a reparametrization invariant way.

Deep learning as optimal control problems: models and numerical methods

no code implementations11 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.

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