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PACE Solver Description: The PACE 2023 Parameterized Algorithms and Computational Experiments Challenge: Twinwidth

Authors Max Bannach , Sebastian Berndt

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Author Details

Max Bannach
  • European Space Agency, Advanced Concepts Team, Noordwijk, The Netherlands
Sebastian Berndt
  • Institute for Theoretical Computer Science, University of Lübeck, Germany

Acknowledgements

The prize money (€4000) was generously provided by Networks, an NWO Gravitation project of the University of Amsterdam, Eindhoven University of Technology, Leiden University and the Center for Mathematics and Computer Science (CWI). We are grateful to the whole optil.io team, led by Szymon Wasik, and especially to Jan Badura and Artur Laskowski for the fruitful collaboration and for hosting the competition at the optil.io online judge system. We also thank André Schidler and Stefan Szeider, who made their exact solver available to the organizers prior to the competition for internal evaluations [André Schidler and Stefan Szeider, 2022].

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Max Bannach and Sebastian Berndt. PACE Solver Description: The PACE 2023 Parameterized Algorithms and Computational Experiments Challenge: Twinwidth. In 18th International Symposium on Parameterized and Exact Computation (IPEC 2023). Leibniz International Proceedings in Informatics (LIPIcs), Volume 285, pp. 35:1-35:14, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2023) https://doi.org/10.4230/LIPIcs.IPEC.2023.35

Abstract

This article is a report by the challenge organizers on the 8th Parameterized Algorithms and Computational Experiments Challenge (PACE 2023). As was common in previous iterations of the competition, this year’s iteration implemented an exact and heuristic track for a parameterized problem that has gained attention in the theory community. This year, the problem was to compute the twinwidth of a graph, a recently introduced width parameter that measures the similarity of a graph to a cograph. In the exact track, the competition participants were asked to develop an exact algorithm that can solve as many instances as possible from a benchmark set of 100 instances - with a time limit of 30 minutes per instance. The same task must be accomplished within 5 minutes in the heuristic track. However, the result in this track is not required to be optimal.
As in previous iterations, the organizers handed out awards to the best solutions in both tracks and to the best student submissions. New this year is a dedicated theory award that appreciates new theoretical insights found by the participants during the development of their tools.

Subject Classification

ACM Subject Classification
  • Theory of computation → Graph algorithms analysis
  • Theory of computation → Parameterized complexity and exact algorithms
Keywords
  • Twinwidth
  • Algorithm Engineering
  • FPT
  • Kernelization

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