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add theory propagation to linear monomial propagation

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2023-09-30 08:52:09 +09:00
parent ddcd1ee992
commit 50654f1f46
9 changed files with 81 additions and 3 deletions
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20
src/math/lp/monomial_bounds.cpp
View file

@ -10,6 +10,7 @@
#include "math/lp/monomial_bounds.h"
#include "math/lp/nla_core.h"
#include "math/lp/nla_intervals.h"
#include "math/lp/numeric_pair.h"
namespace nla {
@ -281,9 +282,21 @@ namespace nla {
propagate_nonfixed(m, k, w);
}
lp::explanation monomial_bounds::get_explanation(u_dependency* dep) {
lp::explanation exp;
svector<lp::constraint_index> cs;
c().lra.dep_manager().linearize(dep, cs);
for (auto d : cs)
exp.add_pair(d, mpq(1));
return exp;
}
void monomial_bounds::propagate_fixed(monic const& m, rational const& k) {
auto* dep = explain_fixed(m, k);
c().lra.update_column_type_and_bound(m.var(), lp::lconstraint_kind::EQ, k, dep);
c().lra.update_column_type_and_bound(m.var(), lp::lconstraint_kind::EQ, k, dep);
// propagate fixed equality
auto exp = get_explanation(dep);
c().add_fixed_equality(m.var(), k, exp);
}
void monomial_bounds::propagate_nonfixed(monic const& m, rational const& k, lpvar w) {
@ -294,6 +307,11 @@ namespace nla {
auto* dep = explain_fixed(m, k);
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, mpq(0), dep);
if (k == 1) {
lp::explanation exp = get_explanation(dep);
c().add_equality(m.var(), w, exp);
}
}
u_dependency* monomial_bounds::explain_fixed(monic const& m, rational const& k) {

1
src/math/lp/monomial_bounds.h
View file

@ -28,6 +28,7 @@ namespace nla {
void propagate_fixed(monic const& m, rational const& k);
void propagate_nonfixed(monic const& m, rational const& k, lpvar w);
u_dependency* explain_fixed(monic const& m, rational const& k);
lp::explanation get_explanation(u_dependency* dep);
bool propagate_down(monic const& m, dep_interval& mi, lpvar v, unsigned power, dep_interval& product);
void analyze_monomial(monic const& m, unsigned& num_free, lpvar& free_v, unsigned& power) const;
bool is_free(lpvar v) const;

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

@ -810,6 +810,8 @@ void core::print_stats(std::ostream& out) {
void core::clear() {
m_lemmas.clear();
m_literals.clear();
m_fixed_equalities.clear();
m_equalities.clear();
}
void core::init_search() {

8
src/math/lp/nla_core.h
View file

@ -44,7 +44,6 @@ bool try_insert(const A& elem, B& collection) {
return true;
}
class core {
friend struct common;
friend class new_lemma;
@ -87,6 +86,8 @@ class core {
std::function<bool(lpvar)> m_relevant;
vector<lemma> m_lemmas;
vector<ineq> m_literals;
vector<equality> m_equalities;
vector<fixed_equality> m_fixed_equalities;
indexed_uint_set m_to_refine;
tangents m_tangents;
basics m_basics;
@ -430,6 +431,11 @@ public:
void collect_statistics(::statistics&);
vector<nla::lemma> const& lemmas() const { return m_lemmas; }
vector<nla::ineq> const& literals() const { return m_literals; }
vector<equality> const& equalities() const { return m_equalities; }
vector<fixed_equality> const& fixed_equalities() const { return m_fixed_equalities; }
void add_fixed_equality(lp::lpvar v, rational const& k, lp::explanation const& e) { m_fixed_equalities.push_back({v, k, e}); }
void add_equality(lp::lpvar i, lp::lpvar j, lp::explanation const& e) { m_equalities.push_back({i, j, e}); }
private:
void restore_patched_values();
void constrain_nl_in_tableau();

9
src/math/lp/nla_solver.cpp
View file

@ -108,4 +108,13 @@ namespace nla {
vector<nla::ineq> const& solver::literals() const {
return m_core->literals();
}
vector<nla::equality> const& solver::equalities() const {
return m_core->equalities();
}
vector<nla::fixed_equality> const& solver::fixed_equalities() const {
return m_core->fixed_equalities();
}
}

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

@ -49,5 +49,7 @@ namespace nla {
void collect_statistics(::statistics & st);
vector<nla::lemma> const& lemmas() const;
vector<nla::ineq> const& literals() const;
vector<nla::fixed_equality> const& fixed_equalities() const;
vector<nla::equality> const& equalities() const;
};
}

14
src/math/lp/nla_types.h
View file

@ -24,6 +24,20 @@ namespace nla {
typedef lp::explanation expl_set;
typedef lp::var_index lpvar;
const lpvar null_lpvar = UINT_MAX;
struct equality {
lp::lpvar i, j;
lp::explanation e;
equality(lp::lpvar i, lp::lpvar j, lp::explanation const& e):i(i),j(j),e(e) {}
};
struct fixed_equality {
lp::lpvar v;
rational k;
lp::explanation e;
fixed_equality(lp::lpvar v, rational const& k, lp::explanation const& e):v(v),k(k),e(e) {}
};
inline int rat_sign(const rational& r) { return r.is_pos()? 1 : ( r.is_neg()? -1 : 0); }
inline rational rrat_sign(const rational& r) { return rational(rat_sign(r)); }

1
src/smt/smt_conflict_resolution.cpp
View file

@ -601,6 +601,7 @@ namespace smt {
finalize_resolve(conflict, not_l);
return true;
}

27
src/smt/theory_lra.cpp
View file

@ -2112,6 +2112,7 @@ public:
bool propagate_core() {
m_model_is_initialized = false;
flush_bound_axioms();
// disabled in master: propagate_nla();
if (!can_propagate_core())
return false;
m_new_def = false;
@ -2144,7 +2145,6 @@ public:
case l_true:
propagate_basic_bounds();
propagate_bounds_with_lp_solver();
// propagate_nla();
break;
case l_undef:
break;
@ -2156,9 +2156,34 @@ public:
if (m_nla) {
m_nla->propagate();
add_lemmas();
add_equalities();
}
}
void add_equalities() {
for (auto const& [v,k,e] : m_nla->fixed_equalities())
add_equality(v, k, e);
for (auto const& [i,j,e] : m_nla->equalities())
add_eq(i,j,e,false);
}
void add_equality(lpvar j, rational const& k, lp::explanation const& exp) {
verbose_stream() << "equality " << j << " " << k << "\n";
TRACE("arith", tout << "equality " << j << " " << k << "\n");
theory_var v;
if (k == 1)
v = m_one_var;
else if (k == 0)
v = m_zero_var;
else if (!m_value2var.find(k, v))
return;
theory_var w = lp().local_to_external(j);
if (w < 0)
return;
lpvar i = register_theory_var_in_lar_solver(v);
add_eq(i, j, exp, true);
}
void add_lemmas() {
for (const nla::ineq& i : m_nla->literals())
assume_literal(i);