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Genetic Programming Theory and Practice XVI pp 1–16Cite as

Exploring Genetic Programming Systems with MAP-Elites

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Part of the book series: Genetic and Evolutionary Computation ((GEVO))

Abstract

MAP-Elites is an evolutionary computation technique that has proven valuable for exploring and illuminating the genotype-phenotype space of a computational problem. In MAP-Elites, a population is structured based on phenotypic traits of prospective solutions; each cell represents a distinct combination of traits and maintains only the most fit organism found with those traits. The resulting map of trait combinations allows the user to develop a better understanding of how each trait relates to fitness and how traits interact. While MAP-Elites has not been demonstrated to be competitive for identifying the optimal Pareto front, the insights it provides do allow users to better understand the underlying problem. In particular, MAP-Elites has provided insight into the underlying structure of problem representations, such as the value of connection cost or modularity to evolving neural networks. Here, we extend the use of MAP-Elites to examine genetic programming representations, using aspects of program architecture as traits to explore. We demonstrate that MAP-Elites can generate programs with a much wider range of architectures than other evolutionary algorithms do (even those that are highly successful at maintaining diversity), which is not surprising as this is the purpose of MAP-Elites. Ultimately, we propose that MAP-Elites is a useful tool for understanding why genetic programming representations succeed or fail and we suggest that it should be used to choose selection techniques and tune parameters.

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Acknowledgements

We thank members of the MSU Digital Evolution Lab for helpful comments and suggestions on this manuscript. This research was supported by the National Science Foundation (NSF) through the BEACON Center (Cooperative Agreement DBI-0939454), Graduate Research Fellowships to ED and AL (Grant No. DGE-1424871), and NSF Grant No. DEB-1655715 to CO. Michigan State University provided computational resources through the Institute for Cyber-Enabled Research and the Digital Scholarship Lab. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the NSF or MSU.

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Authors and Affiliations

  1. BEACON Center for the Study of Evolution in Action and Department of Computer Science and Ecology, Evolutionary Biology, and Behavior Program, Michigan State University, East Lansing, MI, USA

    Emily Dolson, Alexander Lalejini & Charles Ofria

Authors
  1. Emily Dolson
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  2. Alexander Lalejini
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  3. Charles Ofria
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Corresponding author

Correspondence to Emily Dolson .

Editor information

Editors and Affiliations

  1. Computer Science and Engineering, John R. Koza Chair, Michigan State University, East Lansing, MI, USA

    Wolfgang Banzhaf

  2. Cognitive Science, Hampshire College, Amherst, MA, USA

    Lee Spector

  3. Department of Computer Science and Engineering, Michigan State University, East Lansing, MI, USA

    Leigh Sheneman

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Dolson, E., Lalejini, A., Ofria, C. (2019). Exploring Genetic Programming Systems with MAP-Elites. In: Banzhaf, W., Spector, L., Sheneman, L. (eds) Genetic Programming Theory and Practice XVI. Genetic and Evolutionary Computation. Springer, Cham. https://doi.org/10.1007/978-3-030-04735-1_1

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  • DOI: https://doi.org/10.1007/978-3-030-04735-1_1

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-030-04734-4

  • Online ISBN: 978-3-030-04735-1

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