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104 lines
2.3 KiB
C++
104 lines
2.3 KiB
C++
/*++
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Copyright (c) 2013 Microsoft Corporation
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Module Name:
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optsmt.h
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Abstract:
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Objective optimization method.
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Author:
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Anh-Dung Phan (t-anphan) 2013-10-16
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Notes:
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--*/
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#ifndef OPTSMT_H_
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#define OPTSMT_H_
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#include "opt/opt_solver.h"
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namespace opt {
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/**
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Takes solver with hard constraints added.
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Returns an optimal assignment to objective functions.
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*/
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class optsmt {
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ast_manager& m;
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opt_solver* m_s;
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vector<inf_eps> m_lower;
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vector<inf_eps> m_upper;
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app_ref_vector m_objs;
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expr_ref_vector m_lower_fmls;
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svector<smt::theory_var> m_vars;
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symbol m_optsmt_engine;
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model_ref m_model;
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svector<symbol> m_labels;
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sref_vector<model> m_models;
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public:
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optsmt(ast_manager& m):
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m(m), m_s(0), m_objs(m), m_lower_fmls(m) {}
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void setup(opt_solver& solver);
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lbool box();
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lbool lex(unsigned obj_index, bool is_maximize);
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bool is_unbounded(unsigned obj_index, bool is_maximize);
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unsigned add(app* t);
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void updt_params(params_ref& p);
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unsigned get_num_objectives() const { return m_objs.size(); }
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void commit_assignment(unsigned index);
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inf_eps get_lower(unsigned index) const;
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inf_eps get_upper(unsigned index) const;
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bool objective_is_model_valid(unsigned index) const;
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void get_model(model_ref& mdl, svector<symbol>& labels);
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model* get_model(unsigned index) const { return m_models[index]; }
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void update_lower(unsigned idx, inf_eps const& r);
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void update_upper(unsigned idx, inf_eps const& r);
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void reset();
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private:
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bool get_max_delta(vector<inf_eps> const& lower, unsigned& idx);
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lbool basic_opt();
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lbool geometric_opt();
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lbool symba_opt();
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lbool basic_lex(unsigned idx, bool is_maximize);
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lbool geometric_lex(unsigned idx, bool is_maximize);
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lbool farkas_opt();
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void set_max(vector<inf_eps>& dst, vector<inf_eps> const& src, expr_ref_vector& fmls);
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expr_ref update_lower();
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void update_lower_lex(unsigned idx, inf_eps const& r, bool is_maximize);
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lbool update_upper();
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};
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};
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#endif
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