Accession Number : ADA329937

Title :   Combining Multiple Optimization Runs with Optimal Dependency Trees

Corporate Author : CARNEGIE-MELLON UNIV PITTSBURGH PA DEPT OF COMPUTER SCIENCE

Personal Author(s) : Baluja, Shumeet ; Davies, Scott

PDF Url : ADA329937

Report Date : 30 JUN 1997

Pagination or Media Count : 14

Abstract : When trying to solve a combinatorial optimization problem, often multiple algorithms and/or multiple runs of the same algorithm are used in order to find multiple local minima. The information gained from previous search runs is commonly discarded when selecting initialization points for future runs. We present a method which uses information from previous runs to determine promising starting points for future searches. Our algorithm, termed COMIT, models inter-parameter dependencies present in the previously found high-evaluation solutions. COMIT incrementally learns optimal dependency trees that model the pairwise dependencies in a set of good solutions found in previous searches. COMIT then samples the probability distributions modeled by these trees to generate new starting points for future searches. This algorithm has been successfully applied to jobshop scheduling, traveling salesman, knapsack, rectangle packing, and bin-packing problems.

Descriptors :   *OPTIMIZATION, *HEURISTIC METHODS, ALGORITHMS, PROBABILITY DISTRIBUTION FUNCTIONS, COMBINATORIAL ANALYSIS, BAYES THEOREM.

Subject Categories : Computer Programming and Software

Distribution Statement : APPROVED FOR PUBLIC RELEASE