mirrors/z3
3
0
Fork 0
mirror of https://github.com/Z3Prover/z3 synced 2025-05-03 22:05:45 +00:00
Code Activity

use cone of influence reduction before calling nlsat.

Browse source
This commit is contained in:
Nikolaj Bjorner 2023-10-25 16:19:16 -07:00
parent e2db2b864b
commit 20c54048f7
6 changed files with 323 additions and 138 deletions
Download patch file Download diff file Expand all files Collapse all files

49
src/math/lp/nla_grobner.cpp
View file

@ -50,10 +50,10 @@ namespace nla {
return;
}
lp_settings().stats().m_grobner_calls++;
find_nl_cluster();
configure();
if (!configure())
return;
m_solver.saturate();
if (m_delay_base > 0)
@ -89,15 +89,14 @@ namespace nla {
IF_VERBOSE(3, verbose_stream() << "grobner miss, quota " << m_quota << "\n");
IF_VERBOSE(4, diagnose_pdd_miss(verbose_stream()));
}
#if 0
// diagnostics: did we miss something
vector<dd::pdd> eqs;
for (auto eq : m_solver.equations())
eqs.push_back(eq->poly());
c().m_nra.check(eqs);
#endif
dd::solver::equation_vector const& grobner::core_equations(bool all_eqs) {
flet<bool> _add_all(m_add_all_eqs, all_eqs);
find_nl_cluster();
if (!configure())
throw dd::pdd_manager::mem_out();
return m_solver.equations();
}
bool grobner::is_conflicting() {
@ -220,7 +219,7 @@ namespace nla {
return true;
}
void grobner::explain(const dd::solver::equation& eq, lp::explanation& exp) {
void grobner::explain(dd::solver::equation const& eq, lp::explanation& exp) {
u_dependency_manager dm;
vector<unsigned, false> lv;
dm.linearize(eq.dep(), lv);
@ -235,7 +234,7 @@ namespace nla {
lemma &= exp;
}
void grobner::configure() {
bool grobner::configure() {
m_solver.reset();
try {
set_level2var();
@ -253,12 +252,12 @@ namespace nla {
add_fixed_monic(j);
}
}
catch (...) {
catch (dd::pdd_manager::mem_out) {
IF_VERBOSE(2, verbose_stream() << "pdd throw\n");
return;
return false;
}
TRACE("grobner", m_solver.display(tout));
#if 0
IF_VERBOSE(2, m_pdd_grobner.display(verbose_stream()));
dd::pdd_eval eval(m_pdd_manager);
@ -282,6 +281,8 @@ namespace nla {
m_solver.set(cfg);
m_solver.adjust_cfg();
m_pdd_manager.set_max_num_nodes(10000); // or something proportional to the number of initial nodes.
return true;
}
std::ostream& grobner::diagnose_pdd_miss(std::ostream& out) {
@ -389,8 +390,8 @@ namespace nla {
for (auto const& m : c().emons())
m_mon2var[m.vars()] = m.var();
for (auto eq : m_solver.equations())
if (propagate_linear_equations(*eq) && ++changed >= m_solver.number_of_conflicts_to_report())
return true;
if (propagate_linear_equations(*eq))
++changed;
return changed > 0;
}
@ -430,7 +431,7 @@ namespace nla {
lp::lpvar term_index = c().lra.add_term(coeffs, UINT_MAX);
term_index = c().lra.map_term_index_to_column_index(term_index);
c().lra.update_column_type_and_bound(term_index, lp::lconstraint_kind::EQ, offset, e.dep());
c().m_check_feasible = true;
c().m_check_feasible = true;
return true;
}
@ -455,11 +456,16 @@ namespace nla {
continue;
m_rows.insert(row);
unsigned k = lra.get_base_column_in_row(row);
if (lra.column_is_free(k) && k != j)
// grobner bassis does not know about integer constraints
if (lra.column_is_free(k) && !m_add_all_eqs && k != j)
continue;
// a free column over the reals can be assigned
if (lra.column_is_free(k) && k != j && !lra.var_is_int(k))
continue;
CTRACE("grobner", matrix.m_rows[row].size() > c().params().arith_nl_grobner_row_length_limit(),
tout << "ignore the row " << row << " with the size " << matrix.m_rows[row].size() << "\n";);
if (matrix.m_rows[row].size() > c().params().arith_nl_horner_row_length_limit())
tout << "ignore the row " << row << " with the size " << matrix.m_rows[row].size() << "\n";);
// limits overhead of grobner equations, unless this is for extracting a complete COI of the non-satisfied subset.
if (!m_add_all_eqs && matrix.m_rows[row].size() > c().params().arith_nl_horner_row_length_limit())
continue;
for (auto& rc : matrix.m_rows[row])
add_var_and_its_factors_to_q_and_collect_new_rows(rc.var(), q);
@ -585,7 +591,6 @@ namespace nla {
add_eq(sum, dep);
}
void grobner::find_nl_cluster() {
prepare_rows_and_active_vars();
svector<lpvar> q;