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Scaling and Probabilistic Smoothing: Efficient Dynamic Local Search for SAT

Frank HutterContact Information, Dave A. D. TompkinsContact Information and Holger H. HoosContact Information

(5)  Department of Computer Science, University of British Columbia, Vancouver, B. C., V6T 1Z4, Canada
Abstract
In this paper, we study the approach of dynamic local search for the SAT problem. We focus on the recent and promising Exponentiated Sub-Gradient (ESG) algorithm, and examine the factors determining the time complexity of its search steps. Based on the insights gained from our analysis, we developed Scaling and Probabilistic Smoothing (SAPS), an efficient SAT algorithm that is conceptually closely related to ESG. We also introduce a reactive version of SAPS (RSAPS) that adaptively tunes one of the algorithm’s important parameters. We show that for a broad range of standard benchmark problems for SAT, SAPS and RSAPS achieve significantly better performance than both ESG and the state-of-the-art WalkSAT variant, Novelty+.

Contact Information Frank Hutter
Email: mail@fhutter.de
URL: http://www.cs.ubc.ca/labs/beta

Contact Information Dave A. D. Tompkins
Email: davet@cs.ubc.ca

Contact Information Holger H. Hoos
Email: hoos@cs.ubc.ca
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