pyomt 0.0.3

An Optimization Modulo Theory Solver.

A library for OMT(BV) Solving

Optimization Modulo Theory (OMT) extends Satisfiability Modulo Theories (SMT) by incorporating optimization objectives.

The Engines

Reduce to Quantified SMT

• Z3
• CVC5
• Yices-QS
• Bitwuzla

Reduce to Weighted MaxSAT

• The OBV-BS algorithm
• The FM algorithm
• The RC2 algorithm
• Off-the-shelf MaxSAT solvers

https://github.com/FlorentAvellaneda/EvalMaxSAT

SMT-based Iterative Search

• Linear search
• Binary search

TBD

Integration

Exiting OMT solvers?

• Z3 (to MaxSAT?)
• OptiMathSAT
• ...

Optimizations

Improvements to the OBV-BS algorithm

• Variable Polarity Setting: prefer 1 over 0 during the search?

The relevant API (NOTE: some SAT solvers in pysat do not support this API)

    def set_phases(self, literals=[]):
        """
            Sets polarities of a given list of variables.
        """

TBD: to see how to use this API...

References

• Sebastiani, R., & Tomasi, S. (2015). Optimization in SMT with LA(Q) cost functions. In International Conference on Principles and Practice of Constraint Programming (pp. 484-498). Springer, Cham.
• Bjørner, N., Phan, A. D., & Fleckenstein, L. (2015). νZ-an optimizing SMT solver. In International Conference on Tools and Algorithms for the Construction and Analysis of Systems (pp. 194-199). Springer, Berlin, Heidelberg.
• Martins, R., Manquinho, V. M., & Lynce, I. (2014). Open-WBO: A modular MaxSAT solver. In International Conference on Theory and Applications of Satisfiability Testing (pp. 438-445). Springer, Cham.