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Paper

Written Paper

Bucket brigade performance. I. Long sequences of classifiers  [1987]

Riolo, R.L.

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In Holland-type classifier systems the bucket brigade algorithm allocates strength ("credit") to classifiers that lead to rewards from environment. This paper presents results that show the bucket brigade algorithm basically works as designed--strength is passed down sequences of coupled classifiers from those classifiers that receive rewards directly from the environment to those that are stage setters. Results indicate it can take a fairly large number of trials for a classifier system to respond to changes in its environment by reallocating strength down competing sequences of classifiers that implement simple reflex and non-reflex behaviors. However, bridging classifiers' are shown to dramatically decrease the number of times a long sequence must be executed in order reallocate strength to all the classifiers in the sequence. Bridging classifiers also were shown to be one way to avoid problems caused by sharing classifiers across competing sequences.

From the journal

Genetic algorithms and their applications : proceedings of the second International Conference on Genetic Algorithms : July 28-31, 1987 at the Massachusetts Institute of Technology, Cambridge, MA