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A Bayesian Network Approach to Program Generation

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2 Author(s)
Hasegawa, Y. ; Dept. of Frontier Inf., Univ. of Tokyo, Kashiwa ; Iba, H.

Genetic programming (GP) is a powerful optimization algorithm that has been applied to a variety of problems. This algorithm can, however, suffer from problems arising from the fact that a crossover, which is a main genetic operator in GP, randomly selects crossover points, and so building blocks may be destroyed by the action of this operator. In recent years, evolutionary algorithms based on probabilistic techniques have been proposed in order to overcome this problem. In the present study, we propose a new program evolution algorithm employing a Bayesian network for generating new individuals. It employs a special chromosome called the expanded parse tree , which significantly reduces the size of the conditional probability table (CPT). Prior prototype tree-based approaches have been faced with the problem of huge CPTs, which not only require significant memory resources, but also many samples in order to construct the Bayesian network. By applying the present approach to three distinct computational experiments, the effectiveness of this new approach for dealing with deceptive problems is demonstrated.

Published in:

Evolutionary Computation, IEEE Transactions on  (Volume:12 ,  Issue: 6 )

Date of Publication:

Dec. 2008

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