My research lies on the interface of optimization, inverse imaging problems and machine learning where I develop algorithms that are efficient enough for large-scale applications with proven convergence guarantees and robustness. My work bridges mathematical theory to various applications including medical imaging, material sciences, biology and geophysics.
Short Bio: Before joining Bath as a Prize Fellow in 2018 I was a Research Associate at the University of Cambridge after completing degrees at UCL, UK (PhD 2015) and Bremen, Germany (MSc, 2012).
Office: 6 West, 1.08
Tel: 0044 1225 38 6194
University of Bath
Bath BA2 7JU
United Kingdom
02/2021 | New preprint out on Equivariant neural networks for inverse problems. This is joint work with Elena Celledoni (NTNU, Norway), Christian Etmann (Cambridge, UK), Brynjulf Owren (NTNU, Norway), Carola-Bibiane Schönlieb (Cambridge, UK) and Ferdia Sherry (Cambridge, UK). |
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01/2021 | New preprint out on Synergistic Multi-spectral CT Reconstruction with Directional Total Variation. This is joint work with Evelyn Cueva (Escuela Polit´ecnica Nacional and Universidad Tecnica de Cotopaxi, both Ecuador), Alexander Meaney (Helsinki, Finland) and Samuli Siltanen (Helsinki, Finland). |
12/2020 | Our paper Robust Image Reconstruction with Misaligned Structural Information got published by IEEE Access. This is joint work with Leon Bungert (Erlangen, Germany). |
11/2020 | Our paper on Efficient Hyperparameter Tuning with Dynamic Accuracy Derivative-Free Optimization got accepted to the NeurIPS 2020 workshop OPT2020: Optimization for Machine Learning. This is joint work with Lindon Roberts (ANU, Australia). |
10/2020 | New preprint out on faster reconstruction for Magnetic Resonance Fingerprinting, see link. This is joint work with my student Sam Cortinhas and Mohammad Golbabaee (Bath). |
09/2020 | Our paper on Accelerating Variance-Reduced Stochastic Gradient Methods got accepted by Mathematical Programming. This is joint work with Derek Driggs and Carola-Bibiane Schönlieb (both Cambridge, UK). |
08/2020 | Our paper on Learning the Sampling Pattern for MRI got accepted by IEEE Transactions on Medical Imaging. This is joint work with Ferdia Sherry, Martin J. Graves, Georg Maierhofer, Guy Williams, Carola-Bibiane Schönlieb (all Cambridge, UK), Martin Benning (Queen Mary, London, UK) and Juan Carlos De los Reyes (Quito, Ecuador). |
07/2020 | Alberto Paganini and I are organising an LMS-workshop on Imaging meets Computational PDEs. Please sign up here if you want to attend. |
07/2020 | New review paper out on Multi-modality imaging with structure-promoting regularisers. If you are new to image reconstruction from multi-modality imaging data, this is the best place to start! |
06/2020 | New paper out on efficient algorithms for supervised machine learning for inverse problems: Inexact Derivative-Free Optimization for Bilevel Learning. This is joint work with Lindon Roberts (ANU, Australia). |
05/2020 | New paper out on Structure preserving deep learning. In this paper we review several connections between deep learning and mathematical fields like numerical analyis, optimal control and inverse problems. This is joint work with Elena Celledoni (NTNU, Norway), Christian Etmann (Cambridge, UK), Robert McLachlan (Massey University, New Zealand), Brynjulf Owren (NTNU, Norway), Carola-Bibiane Schönlieb (Cambridge, UK) and Ferdia Sherry (Cambridge, UK). |
04/2020 | Congratulations to my PhD student Margaret Duff who was awarded a Doctoral Recognition Award. Only 14 such awards were handed out to PhD students in Bath this year. |
04/2020 | Glad to be named an "outstanding reviewer" for IOP Inverse Problems. |
04/2020 | New paper out on making structure-promoting regularizers robust to misalignment: Robust Image Reconstruction with Misaligned Structural Information. This is joint work with Leon Bungert (Erlangen, Germany). |
03/2020 | We got awarded a "collaborative computational project" (CCP) on Synergistic Reconstruction for Biomedical Imaging by EPSRC. The aim is to develop a software framework to support multi-modality imaging, e.g. PET-MR, SPECT-CT. Lead by Kris Thielemans (UCL), the project includes a wide UK network: David Atkinson (UCL), me (Bath), Julian Matthews (Manchester), Andrew Reader (KCL) and Charalampos "Harry" Tsoumpas (Leeds). This project's predecessor was CCP PET-MR. |
02/2020 | Congratulations to Samuel Cortinhas. He was invited to present his work that he did with me in summer 2019 at this year's Posters in Parliament as part of the British Conference of Undergraduate Research (BCUR). Here you can read more about it. |
01/2020 | Congratulations to my PhD student Margaret Duff who was invited to present her research at the UK Parliament as part of STEM for BRITAIN 2020. |
01/2020 | Chris Budd (Bath, UK) is turning 60 and we are celebrating this with a workshop on 4 March 2020 in Bath, see here for more details. This event is organized by Arie Iserles (Cambridge, UK), Carola-Bibiane Schönlieb (Cambridge, UK) and myself. |