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b5c7f000de
enable to find multiple cores in a round and at the same time facilitate rotation around satisfiable subsets to explore neighborhoods for improved assignments.
72 lines
2 KiB
C++
72 lines
2 KiB
C++
/*++
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Copyright (c) 2022 Microsoft Corporation
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Module Name:
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opt_cores.h
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Abstract:
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"walk" subsets of soft constraints to extract multiple cores and satisfying assignments.
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Author:
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Nikolaj Bjorner (nbjorner) 2022-04-27
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--*/
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#pragma once
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#include "opt/opt_lns.h"
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namespace opt {
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class cores {
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ast_manager& m;
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solver& s;
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lns_context& ctx;
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random_gen m_rand;
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rational m_best_cost = rational::minus_one();
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vector<weighted_core> m_cores;
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obj_map<expr, rational> m_weight;
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unsigned m_max_saturate_conflicts = 500;
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unsigned m_max_conflicts = 1000;
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bool m_hill_climb = true;
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unsigned m_max_num_cores = UINT_MAX;
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unsigned m_max_core_size = 4;
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bool m_enable_core_rotate = false;
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struct scoped_update;
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bool improve();
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void rotate_rec(obj_hashtable<expr> const& mss, obj_map<expr, ptr_vector<expr>>& backbone2core, unsigned depth);
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bool rotate(obj_hashtable<expr> const& mss, expr* excl, unsigned depth);
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void saturate_core(expr_ref_vector& core);
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void local_mss();
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void hitting_set(obj_hashtable<expr>& hs);
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rational core_weight(expr_ref_vector const& core) { return core_weight(core.size(), core.data()); }
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rational core_weight(ptr_vector<expr> const& core) { return core_weight(core.size(), core.data()); }
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rational core_weight(unsigned sz, expr* const* core);
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lbool check_sat_hill_climb(expr_ref_vector const& _soft);
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void add_core(expr_ref_vector const& core);
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vector<weighted_core> const& disjoint_cores();
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void rotate_cores();
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vector<weighted_core> const& weighted_disjoint_cores();
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expr_ref_vector unsat_core();
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public:
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cores(solver& s, lns_context& ctx);
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vector<weighted_core> const& operator()();
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void updt_params(params_ref& p);
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};
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};
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