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Comparing communities of optima with funnels in combinatorial fitness landscapes

Published: 01 July 2017 Publication History

Abstract

The existence of sub-optimal funnels in combinatorial fitness landscapes has been linked to search difficulty. The exact nature of these structures --- and how commonly they appear --- is not yet fully understood. Improving our understanding of funnels could help with designing effective diversification mechanisms for a 'smoothing' effect, making optimisation easier. We model fitness landscapes as local optima networks. The relationship between communities of local optima found by network clustering algorithms and funnels is explored. Funnels are identified using the notion of monotonic sequences from the study of energy landscapes in theoretical chemistry. NK Landscapes and the Quadratic Assignment Problem are used as case studies. Our results show that communities are linked to funnels. The analysis exhibits relationships between these landscape structures and the performance of trajectory-based metaheuristics such as Simulated Annealing (SA) and Iterated Local Search (ILS). In particular, ILS gets trapped in funnels, and modular communities of optima slow it down. The funnels contribute to lower success for SA. We show that increasing the strength of ILS perturbation helps to 'smooth' the funnels and improves performance in multi-funnel landscapes.

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  • (2024)The SLO Hierarchy of pseudo-Boolean Functions and Runtime of Evolutionary AlgorithmsProceedings of the Genetic and Evolutionary Computation Conference10.1145/3638529.3654221(1551-1559)Online publication date: 14-Jul-2024
  • (2024)Information Flow and Laplacian Dynamics on Local Optima Networks2024 IEEE Congress on Evolutionary Computation (CEC)10.1109/CEC60901.2024.10612156(01-08)Online publication date: 30-Jun-2024
  • (2024)Fitness landscapes of buffer allocation problem for production lines with unreliable machinesComputers and Operations Research10.1016/j.cor.2024.106819172:COnline publication date: 1-Dec-2024
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    cover image ACM Conferences
    GECCO '17: Proceedings of the Genetic and Evolutionary Computation Conference
    July 2017
    1427 pages
    ISBN:9781450349208
    DOI:10.1145/3071178
    Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected]

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    Publication History

    Published: 01 July 2017

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    Author Tags

    1. combinatorial fitness landscapes
    2. local optima networks

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    GECCO '17 Paper Acceptance Rate 178 of 462 submissions, 39%;
    Overall Acceptance Rate 1,669 of 4,410 submissions, 38%

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    Cited By

    View all
    • (2024)The SLO Hierarchy of pseudo-Boolean Functions and Runtime of Evolutionary AlgorithmsProceedings of the Genetic and Evolutionary Computation Conference10.1145/3638529.3654221(1551-1559)Online publication date: 14-Jul-2024
    • (2024)Information Flow and Laplacian Dynamics on Local Optima Networks2024 IEEE Congress on Evolutionary Computation (CEC)10.1109/CEC60901.2024.10612156(01-08)Online publication date: 30-Jun-2024
    • (2024)Fitness landscapes of buffer allocation problem for production lines with unreliable machinesComputers and Operations Research10.1016/j.cor.2024.106819172:COnline publication date: 1-Dec-2024
    • (2023)Randomness in Local Optima Network SamplingProceedings of the Companion Conference on Genetic and Evolutionary Computation10.1145/3583133.3596309(2099-2107)Online publication date: 15-Jul-2023
    • (2023)New Knowledge about the Elementary Landscape Decomposition for Solving the Quadratic Assignment ProblemProceedings of the Genetic and Evolutionary Computation Conference10.1145/3583131.3590369(239-247)Online publication date: 15-Jul-2023
    • (2023)Multi-objectivization Relaxes Multi-funnel Structures in Single-objective NK-landscapesEvolutionary Computation in Combinatorial Optimization10.1007/978-3-031-30035-6_13(195-210)Online publication date: 31-Mar-2023
    • (2022)On funnel depths and acceptance criteria in stochastic local searchProceedings of the Genetic and Evolutionary Computation Conference10.1145/3512290.3528831(287-295)Online publication date: 8-Jul-2022
    • (2021)Non-elitist evolutionary algorithms excel in fitness landscapes with sparse deceptive regions and dense valleysProceedings of the Genetic and Evolutionary Computation Conference10.1145/3449639.3459398(1133-1141)Online publication date: 26-Jun-2021
    • (2020)Inferring Future LandscapesEvolutionary Computation10.1162/evco_a_0027128:4(621-641)Online publication date: 1-Dec-2020
    • (2020)Multi-layer local optima networks for the analysis of advanced local search-based algorithmsProceedings of the 2020 Genetic and Evolutionary Computation Conference10.1145/3377930.3390179(219-227)Online publication date: 25-Jun-2020
    • Show More Cited By

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