Inproceedings,

GP and Bloat: Absorbing boundaries and spatial structures

, and .
Proceedings of the Third Asian-Pacific workshop on Genetic Programming, page 1--12. Military Technical Academy, Hanoi, VietNam, (2006)

Abstract

examines the behaviour of bloat for GP tree structures using three different topologies: a panmictic, ring and star structure. Initially genetic drift is examined and the results showing the influence of a lower absorbing boundary are examined for each space. A simple selection model is then applied and analysed for bloat. A conjecture regarding the influence of inbreeding, due to spatial structure, is presented as one mechanism for bloat reduction. The paper shows that spatially-structured GP results in a tradeoff between convergence, diversity and the size of individuals.

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