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Approximate counting in SMT and value estimation for probabilistic programs

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 Dmitry Chistikov
Le mardi 02 juin 2015 à 11:00
Salle de Conférence (Pavillon des Jardins)
Dmitry Chistikov (MPI Software Systems, Germany)

#SMT, or model counting for logical theories, is a well-known hard problem that generalizes such tasks as counting the number of satisfying assignments to a Boolean formula and computing the volume of a polytope. In the realm of satisfiability modulo theories (SMT) there is a growing need for model counting solvers, coming from several application domains (quantitative information flow, static analysis of probabilistic programs).

In this work, we show a reduction from an approximate version of #SMT to SMT. We focus on the theories of integer arithmetic and linear real arithmetic. We propose model counting algorithms that provide approximate solutions with formal bounds on the approximation error. They run in polynomial time and make a polynomial number of queries to the SMT solver for the underlying theory, exploiting ``for free'' sophisticated heuristics implemented within modern SMT solvers. We have implemented the algorithms and used them to solve a value estimation problem for a model of loop-free probabilistic programs with nondeterminism.

Joint work with Rayna Dimitrova and Rupak Majumdar.

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