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integrate factorization to Grobner

This commit is contained in:
Nikolaj Bjorner 2022-07-14 21:24:27 -07:00
parent 7c177584f3
commit b29cdca936
4 changed files with 42 additions and 35 deletions

View file

@ -1311,7 +1311,7 @@ namespace dd {
return m.mk_var(var())*h + l;
}
std::pair<unsigned_vector, pdd> pdd::var_factors() {
std::pair<unsigned_vector, pdd> pdd::var_factors() const {
if (is_val())
return { unsigned_vector(), *this };
unsigned v = var();

View file

@ -367,7 +367,7 @@ namespace dd {
/**
* \brief factor out variables
*/
std::pair<unsigned_vector, pdd> var_factors();
std::pair<unsigned_vector, pdd> var_factors() const;
pdd subst_val(vector<std::pair<unsigned, rational>> const& s) const { return m.subst_val(*this, s); }
pdd subst_val(unsigned v, rational const& val) const { return m.subst_val(*this, v, val); }

View file

@ -35,7 +35,7 @@ core::core(lp::lar_solver& s, reslimit & lim) :
m_grobner(this),
m_emons(m_evars),
m_use_nra_model(false),
m_nra(s, m_nra_lim, *this)
m_nra(s, m_nra_lim, *this)
{
m_nlsat_delay = lp_settings().nlsat_delay();
}
@ -56,9 +56,8 @@ bool core::compare_holds(const rational& ls, llc cmp, const rational& rs) const
rational core::value(const lp::lar_term& r) const {
rational ret(0);
for (lp::lar_term::ival t : r) {
for (lp::lar_term::ival t : r)
ret += t.coeff() * val(t.column());
}
return ret;
}
@ -78,10 +77,9 @@ bool core::ineq_holds(const ineq& n) const {
}
bool core::lemma_holds(const lemma& l) const {
for(const ineq &i : l.ineqs()) {
for (const ineq &i : l.ineqs())
if (ineq_holds(i))
return true;
}
return false;
}
@ -1498,14 +1496,17 @@ lbool core::check(vector<lemma>& l_vec) {
init_search();
lbool ret = l_undef;
bool run_grobner = need_run_grobner();
bool run_horner = need_run_horner();
bool run_bounded_nlsat = should_run_bounded_nlsat();
if (l_vec.empty() && !done())
m_monomial_bounds();
if (l_vec.empty() && !done() && need_run_horner())
if (l_vec.empty() && !done() && run_horner)
m_horner.horner_lemmas();
if (l_vec.empty() && !done() && need_run_grobner())
if (l_vec.empty() && !done() && run_grobner)
m_grobner();
if (l_vec.empty() && !done())
@ -1514,9 +1515,16 @@ lbool core::check(vector<lemma>& l_vec) {
if (l_vec.empty() && !done())
m_basics.basic_lemma(false);
if (!conflict_found() && !done() && should_run_bounded_nlsat())
#if 0
if (l_vec.empty() && !done() && !run_horner)
m_horner.horner_lemmas();
if (l_vec.empty() && !done() && !run_grobner)
m_grobner();
#endif
if (!conflict_found() && !done() && run_bounded_nlsat)
ret = bounded_nlsat();
if (l_vec.empty() && !done() && ret == l_undef) {
std::function<void(void)> check1 = [&]() { m_order.order_lemma(); };

View file

@ -45,7 +45,6 @@ namespace nla {
if (is_conflicting())
return;
#if 0
if (propagate_bounds())
return;
@ -54,7 +53,7 @@ namespace nla {
if (propagate_factorization())
return;
#endif
if (quota > 1)
quota--;
@ -86,19 +85,19 @@ namespace nla {
}
bool grobner::propagate_bounds() {
unsigned bounds = 0;
unsigned changed = 0;
for (auto eq : m_solver.equations())
if (propagate_bounds(*eq) && ++bounds >= m_solver.number_of_conflicts_to_report())
if (propagate_bounds(*eq) && ++changed >= m_solver.number_of_conflicts_to_report())
return true;
return bounds > 0;
return changed > 0;
}
bool grobner::propagate_eqs() {
unsigned fixed = 0;
unsigned changed = 0;
for (auto eq : m_solver.equations())
if (propagate_fixed(*eq) && ++fixed >= m_solver.number_of_conflicts_to_report())
if (propagate_fixed(*eq) && ++changed >= m_solver.number_of_conflicts_to_report())
return true;
return fixed > 0;
return changed > 0;
}
bool grobner::propagate_factorization() {
@ -152,23 +151,23 @@ namespace nla {
bool grobner::propagate_factorization(const dd::solver::equation& eq) {
dd::pdd const& p = eq.poly();
if (!p.is_val() && p.lo().is_zero() && !p.hi().is_val() && p.hi().is_linear()) {
//IF_VERBOSE(0, verbose_stream() << "factored " << p << "\n");
unsigned v = p.var();
auto q = p.hi();
new_lemma lemma(c(), "pdd-factored");
add_dependencies(lemma, eq);
term t;
while (!q.is_val()) {
t.add_monomial(q.hi().val(), q.var());
q = q.lo();
}
lemma |= ineq(v, llc::EQ, rational::zero());
lemma |= ineq(t, llc::EQ, -q.val());
//lemma.display(verbose_stream());
return true;
auto [vars, q] = p.var_factors();
if (vars.empty() || !q.is_linear())
return false;
// IF_VERBOSE(0, verbose_stream() << "factored " << q << " : " << vars << "\n");
new_lemma lemma(c(), "pdd-factored");
add_dependencies(lemma, eq);
term t;
while (!q.is_val()) {
t.add_monomial(q.hi().val(), q.var());
q = q.lo();
}
return false;
for (auto v : vars)
lemma |= ineq(v, llc::EQ, rational::zero());
lemma |= ineq(t, llc::EQ, -q.val());
//lemma.display(verbose_stream());
return true;
}