Branch and Bound for Boolean Optimization and the Generation of Optimality Certificates

  • Authors:
  • Javier Larrosa;Robert Nieuwenhuis;Albert Oliveras;Enric Rodríguez-Carbonell

  • Affiliations:
  • -;-;-;-

  • Venue:
  • SAT '09 Proceedings of the 12th International Conference on Theory and Applications of Satisfiability Testing
  • Year:
  • 2009

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Abstract

We consider optimization problems of the form (S ,cost ), where S is a clause set over Boolean variables x 1 ...x n , with an arbitrary cost function cost : ${\mathbb{B}}^n {\rightarrow} {\mathbb{R}}$, and the aim is to find a model A of S such that cost (A ) is minimized. Here we study the generation of proofs of optimality in the context of branch-and-bound procedures for such problems. For this purpose we introduce , an abstract DPLL-based branch and bound algorithm that can model optimization concepts such as cost-based propagation and cost-based backjumping. Most, if not all, SAT-related optimization problems are in the scope of . Since many of the existing approaches for solving these problems can be seen as instances, allows one to formally reason about them in a simple way and exploit the enhancements of given here, in particular its uniform method for generating independently verifiable optimality proofs.