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Mexi, Gioni, Dr.

Gioni Mexi

Contact

Position
Staff
Room
3101
Phone
+49 30 84185-577
Email
Email
Website
http://iol.zib.de/gionimexi
Division
Mathematical Algorithmic Intelligence
Department
AI in Society, Science and Technology
Group
Interactive Optimization and Learning

Projects

Projects as Head

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MODAL-SynLab

The SynLab works at the interface between data-driven technologies and societally relevant challenges. It develops advanced methods in mathematical optimization and...

MODAL-SynLab
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Solving Supply Chain Management Problems

Supply Chain Management (SCM) deals with the combination of procurement, production, storage, transport, and delivery of commodities. These problems occur in many...

Solving Supply Chain Management Problems
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Linear, Integer, and Constraint Programming

The goal of this project is the development of state-of-the-art methods and software for modeling and solving linear programs (LPs), mixed-integer programs (MIPs), mixed...

Linear, Integer, and Constraint Programming

Projects as Member

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Solving Supply Chain Management Problems

Supply Chain Management (SCM) deals with the combination of procurement, production, storage, transport, and delivery of commodities. These problems occur in many...

Solving Supply Chain Management Problems

Publications

2027
Global Optimization for Combinatorial Geometry Problems Revisited in the Era of LLMs Combinatorial Optimization, pp. 121-135, Vol.16613, Lecture Notes in Computer Science, 2027 Timo Berthold, Dominik Kamp, Gioni Mexi, Sebastian Pokutta, Imre Pólik BibTeX
DOI
arXiv
2026
A Frank-Wolfe-based primal heuristic for quadratic mixed-integer optimization Mathematical Programming Computation, 2026 Gioni Mexi, Deborah Hendrych, Sébastien Designolle, Mathieu Besançon, Sebastian Pokutta BibTeX
DOI
arXiv
A Numerically-safe Branch-Price-and-Cut Algorithm for the Length-Constrained Cycle Partition Problem 2026 Mohammed Ghannam, Ambros Gleixner, Gioni Mexi, Edward Lam BibTeX
arXiv
CHAP: A Hybrid GPU-CPU Heuristic for MIP 2026 Gennesaret Tjusila, Alexander Hoen, Nils-Christian Kempke, Gioni Mexi, Timo Berthold, Ambros Gleixner, Thorsten Koch, Sebastian Pokutta BibTeX
arXiv
Out-of-the-Box Global Optimization for Packing Problems: New Models and Improved Solutions 2026 Timo Berthold, Dominik Kamp, Gioni Mexi, Sebastian Pokutta, Imre Pólik BibTeX
arXiv
Race, Exchange, Improve: Finding high-quality MIP solutions quickly 2026 Gioni Mexi, Daniel Rehfeldt BibTeX
arXiv
2025
A Multi-reference Relaxation Enforced Neighborhood Search Heuristic in SCIP Operations Research Proceedings 2024, pp. 421-427, Lecture Notes in Operations Research, 2025 Suresh Bolusani, Gioni Mexi, Mathieu Besançon, Mark Turner BibTeX
DOI
arXiv
Cut-Based Conflict Analysis in Mixed Integer Programming INFORMS Journal on Computing, p. ijoc.2024.0999, 2025 Gioni Mexi, Felipe Serrano, Timo Berthold, Ambros Gleixner, Jakob Nordström BibTeX
DOI
arXiv
Objective Coefficient Rounding and Almost Symmetries in Binary Programs 2025 Dominik Kuzinowicz, Paweł Lichocki, Gioni Mexi, Marc Pfetsch, Sebastian Pokutta, Max Zimmer BibTeX
arXiv
Scylla: a matrix-free fix-propagate-and-project heuristic for mixed-integer optimization Operations Research Proceedings 2023, pp. 65-72, Lecture Notes in Operations Research, 2025 Gioni Mexi, Mathieu Besançon, Suresh Bolusani, Antonia Chmiela, Alexander Hoen, Ambros Gleixner BibTeX
DOI
arXiv
Sparsity-driven Aggregation of Mixed Integer Programs 23rd International Symposium on Experimental Algorithms (SEA 2025), pp. 27:1-27:15, Vol.338, Leibniz International Proceedings in Informatics, 2025 Liding Xu, Gioni Mexi, Ksenia Bestuzheva BibTeX
DOI
arXiv
State-of-the-art Methods for Pseudo-Boolean Solving with SCIP 2025 Gioni Mexi, Dominik Kamp, Yuji Shinano, Shanwen Pu, Alexander Hoen, Ksenia Bestuzheva, Christopher Hojny, Matthias Walter, Marc Pfetsch, Sebastian Pokutta, Thorsten Koch BibTeX
arXiv
The SCIP Optimization Suite 10.0 2025 Christopher Hojny, Mathieu Besançon, Ksenia Bestuzheva, Sander Borst, João Dionísio, Johannes Ehls, Leon Eifler, Mohammed Ghannam, Ambros Gleixner, Adrian Göß, Alexander Hoen, Jacob von Holly-Ponientzietz, Rolf van der Hulst, Dominik Kamp, Thorsten Koch, Kevin Kofler, Jurgen Lentz, Marco Lübbecke, Stephen J. Maher, Paul Matti Meinhold, Gioni Mexi, Til Mohr, Erik Mühmer, Krunal Kishor Patel, Marc Pfetsch, Sebastian Pokutta, Chantal Reinartz Groba, Felipe Serrano, Yuji Shinano, Mark Turner, Stefan Vigerske, Matthias Walter, Dieter Weninger, Liding Xu BibTeX
arXiv
2024
Branch and Price for the Length-Constrained Cycle Partition Problem 2024 Mohammed Ghannam, Gioni Mexi, Edward Lam, Ambros Gleixner BibTeX
arXiv
Probabilistic Lookahead Strong Branching via a Stochastic Abstract Branching Model Integration of Constraint Programming, Artificial Intelligence, and Operations Research, pp. 56-73, Vol.14743, Lecture Notes in Computer Science, 2024 Gioni Mexi, Somayeh Shamsi, Mathieu Besançon, Pierre Le Bodic BibTeX
DOI
arXiv
The SCIP Optimization Suite 9.0 ZIB-Report 24-02-29 Suresh Bolusani, Mathieu Besançon, Ksenia Bestuzheva, Antonia Chmiela, João Dionísio, Tim Donkiewicz, Jasper van Doornmalen, Leon Eifler, Mohammed Ghannam, Ambros Gleixner, Christoph Graczyk, Katrin Halbig, Ivo Hedtke, Alexander Hoen, Christopher Hojny, Rolf van der Hulst, Dominik Kamp, Thorsten Koch, Kevin Kofler, Jurgen Lentz, Julian Manns, Gioni Mexi, Erik Mühmer, Marc E. Pfetsch, Franziska Schlösser, Felipe Serrano, Yuji Shinano, Mark Turner, Stefan Vigerske, Dieter Weninger, Liding Xu PDF
BibTeX
URN
arXiv
2023
Improving Conflict Analysis in MIP Solvers by Pseudo-Boolean Reasoning 29th International Conference on Principles and Practice of Constraint Programming (CP 2023), pp. 27:1-27:19, Vol.280, Leibniz International Proceedings in Informatics, 2023 Gioni Mexi, Timo Berthold, Ambros Gleixner, Jakob Nordström BibTeX
DOI
arXiv
Using Multiple Reference Vectors and Objective Scaling in the Feasibility Pump EURO Journal on Computational Optimization, Vol.11, p. 100066, 2023 (preprint available as ZIB-Report 22-14) Gioni Mexi, Timo Berthold, Domenico Salvagnin PDF (ZIB-Report)
BibTeX
URN
DOI
2022
Length-Constrained Cycle Partition with an Application to UAV Routing Optimization Methods and Software, 37(6), pp. 2066-2102, 2022 (preprint available as ZIB-Report 20-30) Kai Hoppmann-Baum, Oleg Burdakov, Gioni Mexi, Carl Johan Casselgren, Thorsten Koch PDF (ZIB-Report)
BibTeX
DOI
2021
New Ideas for the Feasibility Pump: Using Multiple Reference Vectors Master's thesis, Technische Universität Berlin, Thorsten Koch, Timo Berthold (Advisors), 2021 Gioni Mexi PDF
BibTeX
URN
2020
Minimum Cycle Partition with Length Requirements Integration of Constraint Programming, Artificial Intelligence, and Operations Research, Emmanuel Hebrard, Nysret Musliu (Eds.), Springer International Publishing: Cham, pp. 273-282, 2020, ISBN: 978-3-030-58941-7 Kai Hoppmann-Baum, Gioni Mexi, Oleg Burdakov, Carl Johan Casselgren, Thorsten Koch BibTeX
DOI
Node Partitioning and Subtours Creation Problem (NPSC) Bachelor's thesis, Technische Universität Berlin, Thorsten Koch, Kai Hoppmann (Advisors), 2020 Gioni Mexi PDF
BibTeX
URN