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Add lp.gomory_efficacy_select (default false) and lp.gomory_candidate_rows (default 3). When enabled, Gomory cut rows are no longer chosen by how close the basic variable is to an integer. Instead, gomory_candidate_rows integer-infeasible GMI-clean rows are sampled uniformly at random, a cut is built for each, and the most efficacious cuts whose efficacy (k - t(x*))/||t||_2 is at least gomory_cut_efficacy_threshold are added (up to num_cuts of them, best first). Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
61 lines
2.1 KiB
C++
61 lines
2.1 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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Lev Nachmanson (levnach)
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Revision History:
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--*/
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#include "math/lp/lp_params_helper.hpp"
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#include <memory>
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#include "util/vector.h"
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#include "params/smt_params_helper.hpp"
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#include "math/lp/lp_settings_def.h"
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template bool lp::vectors_are_equal<lp::mpq>(vector<lp::mpq > const&, vector<lp::mpq> const&);
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void lp::lp_settings::updt_params(params_ref const& _p) {
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smt_params_helper p(_p);
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lp_params_helper lp_p(_p);
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m_enable_hnf = p.arith_enable_hnf();
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m_propagate_eqs = p.arith_propagate_eqs();
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print_statistics = p.arith_print_stats();
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m_print_external_var_name = p.arith_print_ext_var_names();
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report_frequency = p.arith_rep_freq();
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m_simplex_strategy = static_cast<lp::simplex_strategy_enum>(p.arith_simplex_strategy());
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m_nlsat_delay = p.arith_nl_delay();
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auto eps = p.arith_epsilon();
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m_epsilon = rational(std::max(1, (int)(100000*eps)), 100000);
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m_dio = lp_p.dio();
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m_dio_cuts_enable_gomory = lp_p.dio_cuts_enable_gomory();
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m_dio_gomory_enable_period = lp_p.dio_gomory_enable_period();
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m_dio_enable_hnf_cuts = lp_p.dio_cuts_enable_hnf();
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m_dump_bound_lemmas = p.arith_dump_bound_lemmas();
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m_dio_ignore_big_nums = lp_p.dio_ignore_big_nums();
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m_dio_calls_period = lp_p.dio_calls_period();
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m_dio_calls_period_decrease = lp_p.dio_calls_period_decrease();
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m_dio_run_gcd = lp_p.dio_run_gcd();
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m_random_hammers = lp_p.random_hammers();
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m_lcube = lp_p.lcube();
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m_lcube_flips = lp_p.lcube_flips();
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m_gomory_cut_efficacy_filter = lp_p.gomory_cut_efficacy_filter();
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m_gomory_cut_efficacy_threshold = lp_p.gomory_cut_efficacy_threshold();
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m_gomory_efficacy_select = lp_p.gomory_efficacy_select();
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m_gomory_candidate_rows = lp_p.gomory_candidate_rows();
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unsigned hammer_period = lp_p.int_hammer_period();
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SASSERT(hammer_period != 0);
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m_int_find_cube_period = hammer_period;
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m_int_gomory_cut_period = hammer_period;
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m_hnf_cut_period = hammer_period;
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m_max_conflicts = p.max_conflicts();
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}
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