no code implementations • 29 May 2023 • Tobias Friedrich, Timo Kötzing, Aneta Neumann, Frank Neumann, Aishwarya Radhakrishnan
Understanding how evolutionary algorithms perform on constrained problems has gained increasing attention in recent years.
no code implementations • 19 May 2023 • Adel Nikfarjam, Ralf Rothenberger, Frank Neumann, Tobias Friedrich
In this study, we introduce evolutionary algorithms (EAs) employing a well-known SAT solver to maximise diversity among a set of SAT solutions explicitly.
no code implementations • 12 May 2023 • Davide Bilò, Sarel Cohen, Tobias Friedrich, Hans Gawendowicz, Nicolas Klodt, Pascal Lenzner, George Skretas
However, many real-world networks are not shaped by a central designer but instead they emerge and evolve by the interaction of many strategic agents.
no code implementations • 23 Feb 2023 • Tobias Friedrich, Pascal Lenzner, Louise Molitor, Lars Seifert
We contribute to the recent endeavor of investigating residential segregation models with realistic agent behavior by studying Jump Schelling Games with agents having a single-peaked utility function.
no code implementations • 22 Feb 2023 • Katrin Casel, Tobias Friedrich, Martin Schirneck, Simon Wietheger
To this end, we consider restricted graph classes which allow us to characterize the distributions of sensitive attributes for which this form of fairness is tractable from a complexity point of view.
no code implementations • 24 Nov 2022 • Tobias Friedrich, Timo Kötzing, Frank Neumann, Aishwarya Radhakrishnan
Estimation of distribution algorithms (EDAs) provide a distribution - based approach for optimization which adapts its probability distribution during the run of the algorithm.
no code implementations • 2 Nov 2022 • Davin Jeong, Allison Gunby-Mann, Sarel Cohen, Maximilian Katzmann, Chau Pham, Arnav Bhakta, Tobias Friedrich, Sang Chin
More specifically, we utilize the combinatorial structure of replacement paths as a concatenation of shortest paths and use deep learning to find the pivot nodes for stitching shortest paths into replacement paths.
no code implementations • 28 Feb 2022 • Francesco Quinzan, Rajiv Khanna, Moshik Hershcovitch, Sarel Cohen, Daniel G. Waddington, Tobias Friedrich, Michael W. Mahoney
We study the fundamental problem of selecting optimal features for model construction.
1 code implementation • 25 Jan 2022 • Maximilian Böther, Otto Kißig, Martin Taraz, Sarel Cohen, Karen Seidel, Tobias Friedrich
Second, using our benchmark suite, we conduct an in-depth analysis of the popular guided tree search algorithm by Li et al. [NeurIPS 2018], testing various configurations on small and large synthetic and real-world graphs.
1 code implementation • 11 Oct 2021 • Sebastian Angrick, Ben Bals, Niko Hastrich, Maximilian Kleissl, Jonas Schmidt, Vanja Doskoč, Maximilian Katzmann, Louise Molitor, Tobias Friedrich
Human lives are increasingly influenced by algorithms, which therefore need to meet higher standards not only in accuracy but also with respect to explainability.
no code implementations • ICLR 2022 • Maximilian Böther, Otto Kißig, Martin Taraz, Sarel Cohen, Karen Seidel, Tobias Friedrich
Second, using our benchmark suite, we conduct an in-depth analysis of the popular guided tree search algorithm by Li et al. [NeurIPS 2018], testing various configurations on small and large synthetic and real-world graphs.
no code implementations • 12 Feb 2021 • Francesco Quinzan, Vanja Doskoč, Andreas Göbel, Tobias Friedrich
Our algorithm is suitable to maximize a non-monotone submodular function under a $p$-system side constraint, and it achieves a $(p + O(\sqrt{p}))$-approximation for this problem, after only poly-logarithmic adaptive rounds and polynomial queries to the valuation oracle function.
1 code implementation • 15 Jul 2020 • Felix Mujkanovic, Vanja Doskoč, Martin Schirneck, Patrick Schäfer, Tobias Friedrich
Modern time series classifiers display impressive predictive capabilities, yet their decision-making processes mostly remain black boxes to the user.
no code implementations • 15 Nov 2019 • Vanja Doskoč, Tobias Friedrich, Andreas Göbel, Frank Neumann, Aneta Neumann, Francesco Quinzan
We show that our proposed algorithm competes with the state-of-the-art in static settings.
1 code implementation • 6 Nov 2019 • Lukas Behrendt, Katrin Casel, Tobias Friedrich, J. A. Gregor Lagodzinski, Alexander Löser, Marcus Wilhelm
Our generalization of the tree doubling algorithm gives a parameterized 3-approximation, where the parameter is the number of asymmetric edges in a given minimum spanning arborescence.
Data Structures and Algorithms
no code implementations • 5 Feb 2019 • Álvaro Parra, Tat-Jun Chin, Frank Neumann, Tobias Friedrich, Maximilian Katzmann
An alternative approach is to directly search for the subset of correspondences that are pairwise consistent, without optimising the registration function.
no code implementations • 14 Nov 2018 • Vahid Roostapour, Aneta Neumann, Frank Neumann, Tobias Friedrich
We also consider EAMC, a new evolutionary algorithm with polynomial expected time guarantee to maintain $\phi$ approximation ratio, and NSGA-II with two different population sizes as advanced multi-objective optimization algorithm, to demonstrate their challenges in optimizing the maximum coverage problem.
no code implementations • 12 Apr 2017 • Ankit Chauhan, Tobias Friedrich, Francesco Quinzan
It has been observed that many complex real-world networks have certain properties, such as a high clustering coefficient, a low diameter, and a power-law degree distribution.
no code implementations • 13 Sep 2016 • Tobias Friedrich, Timo Kötzing, Markus Wagner
A common strategy for improving optimization algorithms is to restart the algorithm when it is believed to be trapped in an inferior part of the search space.
no code implementations • 10 Aug 2016 • Duc-Cuong Dang, Tobias Friedrich, Timo Kötzing, Martin S. Krejca, Per Kristian Lehre, Pietro S. Oliveto, Dirk Sudholt, Andrew M. Sutton
This proves a sizeable advantage of all variants of the ($\mu$+1) GA compared to (1+1) EA, which requires time $\Theta(n^k)$.
no code implementations • 10 Feb 2015 • Tobias Friedrich, Timo Kötzing, Martin Krejca, Andrew M. Sutton
For this, we model sexual recombination with a simple estimation of distribution algorithm called the Compact Genetic Algorithm (cGA), which we compare with the classical $\mu+1$ EA.
no code implementations • 30 Nov 2014 • Tobias Friedrich, Markus Wagner
We investigate the effect of two seeding techniques for five algorithms on 48 optimization problems with 2, 3, 4, 6, and 8 objectives.
no code implementations • 16 Sep 2013 • Tobias Friedrich, Frank Neumann, Christian Thyssen
We consider indicator-based algorithms whose goal is to maximize the hypervolume for a given problem by distributing {\mu} points on the Pareto front.