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4076820fe7
Add lp.gomory_cut_orthogonality (default false), lp.gomory_recent_cuts (default 5) and lp.gomory_parallelism_threshold (default 0.9). When efficacy selection (select or augment) is active and orthogonality is enabled, a non-priority candidate cut is skipped when its parallelism |a.b|/(||a|| ||b||) with an already-selected cut this round, or with one of the last gomory_recent_cuts cuts added in previous rounds (kept in int_solver::m_recent_cuts), exceeds gomory_parallelism_threshold. Adds lar_term::find_coeff and gomory::cut_parallelism. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
41 lines
1 KiB
C++
41 lines
1 KiB
C++
/*++
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Copyright (c) 2017 Microsoft Corporation
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Module Name:
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<name>
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Abstract:
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<abstract>
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Author:
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Nikolaj Bjorner (nbjorner)
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Lev Nachmanson (levnach)
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Revision History:
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--*/
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#pragma once
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#include "math/lp/lar_term.h"
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#include "math/lp/lia_move.h"
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#include "math/lp/explanation.h"
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#include "math/lp/static_matrix.h"
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namespace lp {
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class int_solver;
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class lar_solver;
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class gomory {
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class int_solver& lia;
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class lar_solver& lra;
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unsigned_vector gomory_select_int_infeasible_vars(unsigned num_cuts);
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unsigned_vector gomory_select_random_rows(unsigned num_rows);
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bool is_gomory_cut_target(lpvar j);
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bool cut_has_enough_efficacy(const lar_term& t, const mpq& k);
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double cut_efficacy(const lar_term& t, const mpq& k);
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double cut_parallelism(const lar_term& a, const lar_term& b);
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u_dependency* add_deps(u_dependency*, const row_strip<mpq>&, lpvar);
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public:
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lia_move get_gomory_cuts(unsigned num_cuts);
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gomory(int_solver& lia);
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};
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}
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