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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