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Authors: Atif Rafiq ; Enrique Naredo ; Meghana Kshirsagar and Conor Ryan

Affiliation: BDS Lab, University of Limerick, Ireland

Keyword(s): Hierarchical GAs, Incremental Evolution, Layered Learning, Individuals Processed, Pyramid, Z-test.

Abstract: Pyramid is a hierarchical approach to Evolutionary Computation that decomposes problems by first tackling simpler versions of them before scaling up to increasingly more difficult versions with smaller populations. Previous work showed that Pyramid was mostly as good or better than a standard GA approach, but that it did so with a fraction of individuals processed. Pyramid requires two key parameters to manage the problem complexity; (i) a threshold α as the performance bar, and (ii) β as the container with the maximum number of individuals to survive to the next level down. Pyramid-Z addressed the shortcomings of Pyramid by automating the choice of α (to assure that the top individuals are highly significantly better from the original population at the current level) and makes β less aggressive (to maintain a moderately sized population at the final level). In cases where evolution starts to stagnate at the final level, the population enters into a different form of evolution, drive n by a form of hyper-mutation that runs until either a satisfactory fitness has been found or the total evaluation budget has been exhausted. The experimental results show that Pyramid-Z consistently outperforms the previous version and the baseline too. (More)


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Paper citation in several formats:
Rafiq, A.; Naredo, E.; Kshirsagar, M. and Ryan, C. (2021). Pyramid-Z: Evolving Hierarchical Specialists in Genetic Algorithms. In Proceedings of the 13th International Joint Conference on Computational Intelligence - ECTA, ISBN 978-989-758-534-0; ISSN 2184-2825, pages 49-58. DOI: 10.5220/0010657400003063

author={Atif Rafiq. and Enrique Naredo. and Meghana Kshirsagar. and Conor Ryan.},
title={Pyramid-Z: Evolving Hierarchical Specialists in Genetic Algorithms},
booktitle={Proceedings of the 13th International Joint Conference on Computational Intelligence - ECTA,},


JO - Proceedings of the 13th International Joint Conference on Computational Intelligence - ECTA,
TI - Pyramid-Z: Evolving Hierarchical Specialists in Genetic Algorithms
SN - 978-989-758-534-0
IS - 2184-2825
AU - Rafiq, A.
AU - Naredo, E.
AU - Kshirsagar, M.
AU - Ryan, C.
PY - 2021
SP - 49
EP - 58
DO - 10.5220/0010657400003063