Data provider:

Icon data provider

The National Agricultural Library is one of four national libraries of the United States, with locations in Beltsville, Maryland and Washington, D.C. It houses one of the world's largest and most accessible agricultural information collections and serves as the nexus for a national network of state land-grant and U.S. Department of Agriculture field libraries. In fiscal year 2011 (Oct 2010 through Sept 2011) NAL delivered more than 100 million direct customer service transactions.

Journal Article

Journal article

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

Riolo, R.L.;

Access the full text

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