Search Results for author: Tobias Friedrich

Found 23 papers, 4 papers with code

Analysis of the (1+1) EA on LeadingOnes with Constraints

no code implementations29 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.

Evolutionary Algorithms

Evolutionary Diversity Optimisation in Constructing Satisfying Assignments

no code implementations19 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.

Evolutionary Algorithms

Temporal Network Creation Games

no code implementations12 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.

Single-Peaked Jump Schelling Games

no code implementations23 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.

Fair Correlation Clustering in Forests

no code implementations22 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.

Attribute Clustering +1

Theoretical Study of Optimizing Rugged Landscapes with the cGA

no code implementations24 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.

Deep Distance Sensitivity Oracles

no code implementations2 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.

What's Wrong with Deep Learning in Tree Search for Combinatorial Optimization

1 code implementation25 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.

Combinatorial Optimization Graph Learning

Towards Explainable Real Estate Valuation via Evolutionary Algorithms

1 code implementation11 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.

Decision Making Evolutionary Algorithms

What’s Wrong with Deep Learning in Tree Search for Combinatorial Optimization

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.

Combinatorial Optimization

Adaptive Sampling for Fast Constrained Maximization of Submodular Function

no code implementations12 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.

Data Summarization

timeXplain -- A Framework for Explaining the Predictions of Time Series Classifiers

1 code implementation15 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.

Decision Making Explainable artificial intelligence +5

From Symmetry to Asymmetry: Generalizing TSP Approximations by Parametrization

1 code implementation6 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

A Practical Maximum Clique Algorithm for Matching with Pairwise Constraints

no code implementations5 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.

Point Cloud Registration

Pareto Optimization for Subset Selection with Dynamic Cost Constraints

no code implementations14 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.

Approximating Optimization Problems using EAs on Scale-Free Networks

no code implementations12 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.

Clustering Evolutionary Algorithms

A Generic Bet-and-run Strategy for Speeding Up Traveling Salesperson and Minimum Vertex Cover

no code implementations13 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.

Combinatorial Optimization

Escaping Local Optima using Crossover with Emergent or Reinforced Diversity

no code implementations10 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 $\Theta(n^k)$.

The Benefit of Sex in Noisy Evolutionary Search

no code implementations10 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.

Seeding the Initial Population of Multi-Objective Evolutionary Algorithms: A Computational Study

no code implementations30 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.

Evolutionary Algorithms

Multiplicative Approximations, Optimal Hypervolume Distributions, and the Choice of the Reference Point

no code implementations16 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.

Evolutionary Algorithms

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