Efficiently Exploiting Dependencies in Local Search for SAT

Duc-Nghia Pham, John Thornton, Abdul Sattar

We propose a new local search platform that splits a CNF formula into three sub-components: i) a minimal dependency lattice (representing the core connections between logic gates), ii) a conjunction of equivalence clauses, and iii) the remaining clauses. We also adopt a new hierarchical cost function that focuses on solving the core components of the problem first. We then show experimentally that our platform not only significantly outperforms existing local search approaches but is also competitive with modern systematic solvers on highly structured problems.

Subjects: 15.2 Constraint Satisfaction; 15.7 Search

Submitted: Apr 15, 2008

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