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create scalars for fixed variables in rows for grobner

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Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
This commit is contained in:
Lev Nachmanson 2019-12-29 13:42:11 -08:00
parent 279bcb733d
commit c6e5d434b2
5 changed files with 48 additions and 18 deletions
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30
src/math/lp/nla_common.cpp
View file

@ -123,8 +123,19 @@ unsigned common::random() {
}
// creates a nex expression for the coeff and var,
nex * common::nexvar(const rational & coeff, lpvar j, nex_creator& cn) {
nex * common::nexvar(const rational & coeff, lpvar j, nex_creator& cn,
u_dependency*& dep,
u_dependency_manager* dep_manager) {
SASSERT(!coeff.is_zero());
unsigned lc, uc;
if (c().var_is_fixed(j)) {
if (dep_manager) {
c().m_lar_solver.get_bound_constraint_witnesses_for_column(j, lc, uc);
dep = dep_manager->mk_join(dep, dep_manager->mk_leaf(lc));
dep = dep_manager->mk_join(dep, dep_manager->mk_leaf(uc));
}
return cn.mk_scalar(c().m_lar_solver.column_lower_bound(j).x);
}
if (!c().is_monic_var(j)) {
c().insert_to_active_var_set(j);
return cn.mk_mul(cn.mk_scalar(coeff), cn.mk_var(j));
@ -133,9 +144,18 @@ nex * common::nexvar(const rational & coeff, lpvar j, nex_creator& cn) {
nex_creator::mul_factory mf(cn);
mf *= coeff;
for (lpvar k : m.vars()) {
c().insert_to_active_var_set(k);
mf *= cn.mk_var(k);
CTRACE("nla_grobner", c().is_monic_var(k), c().print_var(k, tout) << "\n";);
if (c().var_is_fixed(j)) {
if (dep_manager) {
c().m_lar_solver.get_bound_constraint_witnesses_for_column(j, lc, uc);
dep = dep_manager->mk_join(dep, dep_manager->mk_leaf(lc));
dep = dep_manager->mk_join(dep, dep_manager->mk_leaf(uc));
}
mf *= c().m_lar_solver.column_lower_bound(j).x;
} else {
c().insert_to_active_var_set(k);
mf *= cn.mk_var(k);
CTRACE("nla_grobner", c().is_monic_var(k), c().print_var(k, tout) << "\n";);
}
}
nex* e = mf.mk();
TRACE("nla_grobner", tout << *e;);
@ -154,7 +174,7 @@ template <typename T> u_dependency* common::create_sum_from_row(const T& row,
SASSERT(row.size() > 1);
sum.reset();
for (const auto &p : row) {
nex* e = nexvar(p.coeff(), p.var(), cn);
nex* e = nexvar(p.coeff(), p.var(), cn, dep, dep_manager);
if (!e)
continue;
unsigned lc, uc;

2
src/math/lp/nla_common.h
View file

@ -116,7 +116,7 @@ struct common {
typedef lp::constraint_index value;
};
nex* nexvar(const rational& coeff, lpvar j, nex_creator&);
nex* nexvar(const rational& coeff, lpvar j, nex_creator&, u_dependency*&, u_dependency_manager*);
template <typename T>
u_dependency* create_sum_from_row(const T&, nex_creator&, nex_creator::sum_factory&, u_dependency_manager*);
template <typename T>

30
src/math/lp/nla_core.cpp
View file

@ -1482,7 +1482,17 @@ void core::add_var_and_its_factors_to_q_and_collect_new_rows(lpvar j, svector<lp
}
dd::pdd core::pdd_expr(const rational& c, lpvar j) {
dd::pdd core::pdd_expr(const rational& c, lpvar j, u_dependency*& dep) {
unsigned lc, uc;
m_lar_solver.get_bound_constraint_witnesses_for_column(j, lc, uc);
if (lc != null_lpvar)
dep = m_intervals.mk_join(dep, m_intervals.mk_leaf(lc));
if (uc != null_lpvar)
dep = m_intervals.mk_join(dep, m_intervals.mk_leaf(uc));
if (var_is_fixed(j)) {
return m_pdd_manager.mk_val(c * m_lar_solver.column_lower_bound(j).x);
}
if (!is_monic_var(j))
return c * m_pdd_manager.mk_var(j);
@ -1490,7 +1500,14 @@ dd::pdd core::pdd_expr(const rational& c, lpvar j) {
dd::pdd r = m_pdd_manager.mk_val(c);
const monic& m = emons()[j];
for (lpvar k : m.vars()) {
r *= m_pdd_manager.mk_var(k);
if (var_is_fixed(k)) {
r *= m_pdd_manager.mk_val(m_lar_solver.column_lower_bound(k).x);
m_lar_solver.get_bound_constraint_witnesses_for_column(k, lc, uc);
dep = m_intervals.mk_join(dep, m_intervals.mk_leaf(lc));
dep = m_intervals.mk_join(dep, m_intervals.mk_leaf(uc));
} else {
r *= m_pdd_manager.mk_var(k);
}
}
return r;
}
@ -1499,14 +1516,7 @@ void core::add_row_to_pdd_grobner(const vector<lp::row_cell<rational>> & row) {
u_dependency *dep = nullptr;
dd::pdd sum = m_pdd_manager.mk_val(rational(0));
for (const auto &p : row) {
dd::pdd e = pdd_expr(p.coeff(), p.var());
sum += e;
unsigned lc, uc;
m_lar_solver.get_bound_constraint_witnesses_for_column(p.var(), lc, uc);
if (lc != null_lpvar)
dep = m_intervals.mk_join(dep, m_intervals.mk_leaf(lc));
if (uc != null_lpvar)
dep = m_intervals.mk_join(dep, m_intervals.mk_leaf(uc));
sum += pdd_expr(p.coeff(), p.var(), dep);
}
m_pdd_grobner.add(sum, dep);
}

2
src/math/lp/nla_core.h
View file

@ -402,7 +402,7 @@ public:
unsigned get_var_weight(lpvar) const;
void add_row_to_pdd_grobner(const vector<lp::row_cell<rational>> & row);
void check_pdd_eq(const dd::grobner::equation*);
dd::pdd pdd_expr(const rational& c, lpvar j);
dd::pdd pdd_expr(const rational& c, lpvar j, u_dependency*&);
void set_level2var_for_pdd_grobner();
}; // end of core

2
src/math/lp/nla_grobner.cpp
View file

@ -54,7 +54,7 @@ void grobner::check_eq(grobner_core::equation* target) {
c().print_var(j, tout);
}
tout << "\ntarget->expr() val = " << get_nex_val(target->expr(), [this](unsigned j) { return c().val(j); }) << "\n";);
m_reported++;
c().lp_settings().stats().m_grobner_conflicts++;
}
}