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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. II. Default hierarchies  [1987]

Riolo, R.L.;

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Learning systems that operate in environments with huge numbers of states must be able to categorize the states into equivalence classes that can be treated alike. Holland-type classifier systems can learn to categorize states by building default hierarchies of classifiers (rules). However, for default hierarchies to work properly classifiers that implement exception rules must be able to control the system when they are applicable, thus preventing the default rules from making mistakes. This paper presents results that show the standard bucket brigade algorithm does not lead to correct exception rules always winning the competition with the default rules they protect. A simple modification to the bucket brigade algorithm is suggested, and results are presented that show this modification works as desired: default hierarchies can be made to achieve payoff rates as near to optimal as desired.

Журнал

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