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Grid is good. Adaptive refinement algorithms for off-the-grid total variation minimization
Umeå University, Faculty of Science and Technology, Department of Mathematics and Mathematical Statistics.
Institut de Mathématiques de Toulouse (IMT), Université de Toulouse, CNRS, INSA, France.
Institut de Recherche en Informatique de Toulouse (IRIT), Université de Toulouse, CNRS, Centre de Biologie Intégrative (CBI), Laboratoire de biologie Moléculaire, Cellulaire et Développement (MCD), France.
2025 (English)In: Open Journal of Mathematical Optimization, E-ISSN 2777-5860, Vol. 6, article id 3Article in journal (Refereed) Published
Abstract [en]

We propose an adaptive refinement algorithm to solve total variation regularized measure optimization problems. The method iteratively constructs dyadic partitions of the unit cube based on (i) the resolution of discretized dual problems and (ii) the detection of cells containing points that violate the dual constraints. The detection is based on upper-bounds on the dual certificate, in the spirit of branch-and-bound methods. The interest of this approach is that it avoids the use of heuristic approaches to find the maximizers of dual certificates. We prove the convergence of this approach under mild hypotheses and a linear convergence rate under additional non-degeneracy assumptions. These results are confirmed by simple numerical experiments.1

Place, publisher, year, edition, pages
Cellule MathDoc/Centre Mersenne , 2025. Vol. 6, article id 3
Keywords [en]
Frank–Wolfe, measure spaces, Total variation
National Category
Computational Mathematics
Identifiers
URN: urn:nbn:se:umu:diva-242250DOI: 10.5802/ojmo.39Scopus ID: 2-s2.0-105000230521OAI: oai:DiVA.org:umu-242250DiVA, id: diva2:1984746
Funder
Wallenberg AI, Autonomous Systems and Software Program (WASP)Available from: 2025-07-17 Created: 2025-07-17 Last updated: 2025-07-17Bibliographically approved

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Flinth, Axel

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