Improving a MaxSAT solver by simplifying clause set.

Abstract

SATELITE is a preprocess of SAT solver. It eliminates variables and clauses, and decreases runtime of SAT solver. We use it in MaxSAT solver QMaxSAT which uses a normal SAT solver as an inference engine and CNF encodings of Boolean cardinality constraints. We compare QMaxSAT with SATELITE and without SATELITE by solving MaxSAT instances taken from the MaxSAT Evaluation 2014 while changing SAT solver. In this comparison, we use minisat2.0, minisat2.2.0, and glucose3.0 as an inference engine, and the CNF encoding ``auto'' which selects an appropriate CNF encoding form three encodings.