## Abstract

The compact genetic algorithm is an Estimation of Distribution Algorithm for binary optimisation problems. Unlike the standard Genetic Algorithm, no cross-over or mutation is involved. Instead, the compact Genetic Algorithm uses a virtual population represented as a probability distribution over the set of binary strings. At each optimisation iteration, exactly two individuals are generated by sampling from the distribution, and compared exactly once to determine a winner and a loser. The probability distribution is then adjusted to increase the likelihood of generating individuals similar to the winner. This paper introduces two straightforward variations of the compact Genetic Algorithm, each of which leads to a significant improvement in performance. The main idea is to make better use of each fitness evaluation, by ensuring that each evaluated individual is used in multiple win/loss comparisons. The first variation is to sample n > 2 individuals at each iteration to make n(n - l)/2 comparisons. The second variation only samples one individual at each iteration but keeps a sliding history window of previous individuals to compare with. We evaluate the methods on two noisy test problems and show that in each case they significantly outperform the compact Genetic Algorithm, while maintaining the simplicity of the algorithm.

Original language | English |
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Title of host publication | 2017 IEEE Symposium Series on Computational Intelligence, SSCI 2017 : Proceedings |

Publisher | Institute of Electrical and Electronics Engineers Inc. |

Number of pages | 8 |

ISBN (Electronic) | 9781538627259 |

DOIs | |

Publication status | Published - 2017 |

Externally published | Yes |

Event | 2017 IEEE Symposium Series on Computational Intelligence, SSCI 2017 - United States, Honolulu, United States Duration: 27 Nov 2017 → 1 Dec 2017 |

### Conference

Conference | 2017 IEEE Symposium Series on Computational Intelligence, SSCI 2017 |
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Country/Territory | United States |

City | Honolulu |

Period | 27/11/17 → 1/12/17 |

Other | IEEE |

### Bibliographical note

Publisher Copyright:© 2017 IEEE.

## Keywords

- binary optimisation
- Compact genetic algorithm
- discrete optimisation
- estimation of distribution
- evolutionary algorithm
- sliding window