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adding lns

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2018-03-13 13:31:27 -07:00
parent 64954cc551
commit 4375f54c45
7 changed files with 257 additions and 21 deletions
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74
src/opt/opt_context.cpp
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@ -145,9 +145,8 @@ namespace opt {
}
void context::reset_maxsmts() {
map_t::iterator it = m_maxsmts.begin(), end = m_maxsmts.end();
for (; it != end; ++it) {
dealloc(it->m_value);
for (auto& kv : m_maxsmts) {
dealloc(kv.m_value);
}
m_maxsmts.reset();
}
@ -255,6 +254,9 @@ namespace opt {
if (m_pareto) {
return execute_pareto();
}
if (m_lns) {
return execute_lns();
}
if (m_box_index != UINT_MAX) {
return execute_box();
}
@ -271,10 +273,16 @@ namespace opt {
#endif
solver& s = get_solver();
s.assert_expr(m_hard_constraints);
IF_VERBOSE(1, verbose_stream() << "(optimize:check-sat)\n";);
opt_params optp(m_params);
symbol pri = optp.priority();
if (pri == symbol("lns")) {
return execute_lns();
}
IF_VERBOSE(1, verbose_stream() << "(optimize:check-sat)\n");
lbool is_sat = s.check_sat(0,0);
TRACE("opt", tout << "initial search result: " << is_sat << "\n";
s.display(tout););
TRACE("opt", s.display(tout << "initial search result: " << is_sat << "\n"););
if (is_sat != l_false) {
s.get_model(m_model);
s.get_labels(m_labels);
@ -286,7 +294,7 @@ namespace opt {
TRACE("opt", tout << m_hard_constraints << "\n";);
return is_sat;
}
IF_VERBOSE(1, verbose_stream() << "(optimize:sat)\n";);
IF_VERBOSE(1, verbose_stream() << "(optimize:sat)\n");
TRACE("opt", model_smt2_pp(tout, m, *m_model, 0););
m_optsmt.setup(*m_opt_solver.get());
update_lower();
@ -303,6 +311,9 @@ namespace opt {
if (pri == symbol("pareto")) {
is_sat = execute_pareto();
}
else if (pri == symbol("lns")) {
is_sat = execute_lns();
}
else if (pri == symbol("box")) {
is_sat = execute_box();
}
@ -525,7 +536,12 @@ namespace opt {
}
void context::yield() {
m_pareto->get_model(m_model, m_labels);
if (m_pareto) {
m_pareto->get_model(m_model, m_labels);
}
else if (m_lns) {
m_lns->get_model(m_model, m_labels);
}
update_bound(true);
update_bound(false);
}
@ -536,7 +552,7 @@ namespace opt {
}
lbool is_sat = (*(m_pareto.get()))();
if (is_sat != l_true) {
set_pareto(0);
set_pareto(nullptr);
}
if (is_sat == l_true) {
yield();
@ -544,6 +560,20 @@ namespace opt {
return is_sat;
}
lbool context::execute_lns() {
if (!m_lns) {
m_lns = alloc(lns, *this, m_solver.get());
}
lbool is_sat = (*(m_lns.get()))();
if (is_sat != l_true) {
m_lns = nullptr;
}
if (is_sat == l_true) {
yield();
}
return l_undef;
}
std::string context::reason_unknown() const {
if (m.canceled()) {
return Z3_CANCELED_MSG;
@ -990,6 +1020,24 @@ namespace opt {
}
}
/**
\brief retrieve literals used by the neighborhood search feature.
*/
void context::get_lns_literals(expr_ref_vector& lits) {
for (objective & obj : m_objectives) {
switch(obj.m_type) {
case O_MAXSMT:
for (expr* f : obj.m_terms) {
lits.push_back(f);
}
break;
default:
break;
}
}
}
bool context::verify_model(unsigned index, model* md, rational const& _v) {
rational r;
app_ref term = m_objectives[index].m_term;
@ -1352,7 +1400,8 @@ namespace opt {
}
void context::clear_state() {
set_pareto(0);
m_pareto = nullptr;
m_lns = nullptr;
m_box_index = UINT_MAX;
m_model.reset();
}
@ -1388,9 +1437,8 @@ namespace opt {
m_solver->updt_params(m_params);
}
m_optsmt.updt_params(m_params);
map_t::iterator it = m_maxsmts.begin(), end = m_maxsmts.end();
for (; it != end; ++it) {
it->m_value->updt_params(m_params);
for (auto & kv : m_maxsmts) {
kv.m_value->updt_params(m_params);
}
opt_params _p(p);
m_enable_sat = _p.enable_sat();