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fix lower/upper bound updates

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2013-12-14 09:04:48 +02:00
parent 8c85ee6b7c
commit 5225ea18b7
5 changed files with 23 additions and 17 deletions
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23
src/opt/fu_malik.cpp
View file

@ -43,28 +43,31 @@ namespace opt {
struct fu_malik::imp {
ast_manager& m;
solver & m_original_solver;
ref<solver> m_s;
expr_ref_vector m_soft;
expr_ref_vector m_orig_soft;
expr_ref_vector m_aux;
expr_ref_vector m_assignment;
unsigned m_upper_size;
unsigned m_upper;
unsigned m_lower;
model_ref m_model;
ref<solver> m_s;
solver & m_original_solver;
bool m_use_new_bv_solver;
imp(ast_manager& m, solver& s, expr_ref_vector const& soft):
m(m),
m_original_solver(s),
m_s(&s),
m_soft(soft),
m_orig_soft(soft),
m_aux(m),
m_assignment(m),
m_original_solver(s),
m_upper(0),
m_lower(0),
m_use_new_bv_solver(false)
{
m_upper_size = m_soft.size() + 1;
m_upper = m_soft.size() + 1;
}
solver& s() { return *m_s; }
@ -156,7 +159,7 @@ namespace opt {
}
lbool step() {
IF_VERBOSE(1, verbose_stream() << "(opt.max_sat step " << m_soft.size() + 2 - m_upper_size << ")\n";);
IF_VERBOSE(1, verbose_stream() << "(opt.max_sat step " << m_soft.size() + 2 - m_upper << ")\n";);
expr_ref_vector assumptions(m), block_vars(m);
for (unsigned i = 0; i < m_soft.size(); ++i) {
assumptions.push_back(m.mk_not(m_aux[i].get()));
@ -295,14 +298,14 @@ namespace opt {
lbool is_sat = l_true;
do {
is_sat = step();
--m_upper_size;
--m_upper;
}
while (is_sat == l_false);
if (is_sat == l_true) {
// Get a list of satisfying m_soft
s().get_model(m_model);
m_lower = m_upper;
m_assignment.reset();
for (unsigned i = 0; i < m_orig_soft.size(); ++i) {
expr_ref val(m);
@ -335,10 +338,10 @@ namespace opt {
return (*m_imp)();
}
rational fu_malik::get_lower() const {
return rational(0);
return rational(m_imp->m_lower);
}
rational fu_malik::get_upper() const {
return rational(m_imp->m_upper_size);
return rational(m_imp->m_upper);
}
rational fu_malik::get_value() const {
return rational(m_imp->m_assignment.size());

6
src/opt/opt_context.cpp
View file

@ -381,12 +381,10 @@ namespace opt {
objective & obj = m_objectives[i];
switch(obj.m_type) {
case O_MINIMIZE:
obj.m_index = m_optsmt.get_num_objectives();
m_optsmt.add(obj.m_term, false);
obj.m_index = m_optsmt.add(obj.m_term, false);
break;
case O_MAXIMIZE:
obj.m_index = m_optsmt.get_num_objectives();
m_optsmt.add(obj.m_term, true);
obj.m_index = m_optsmt.add(obj.m_term, true);
break;
case O_MAXSMT: {
maxsmt& ms = *m_maxsmts.find(obj.m_id);

3
src/opt/optsmt.cpp
View file

@ -349,7 +349,7 @@ namespace opt {
}
}
void optsmt::add(app* t, bool is_max) {
unsigned optsmt::add(app* t, bool is_max) {
expr_ref t1(t, m), t2(m);
th_rewriter rw(m);
if (!is_max) {
@ -362,6 +362,7 @@ namespace opt {
m_is_max.push_back(is_max);
m_lower.push_back(inf_eps(rational(-1),inf_rational(0)));
m_upper.push_back(inf_eps(rational(1), inf_rational(0)));
return m_objs.size()-1;
}
void optsmt::updt_params(params_ref& p) {

2
src/opt/optsmt.h
View file

@ -47,7 +47,7 @@ namespace opt {
lbool lex(unsigned obj_index);
void add(app* t, bool is_max);
unsigned add(app* t, bool is_max);
void set_cancel(bool f);

6
src/opt/weighted_maxsat.cpp
View file

@ -291,6 +291,7 @@ namespace opt {
expr_ref_vector m_assignment;
vector<rational> m_weights;
rational m_upper;
rational m_lower;
model_ref m_model;
imp(ast_manager& m, opt_solver& s, expr_ref_vector& soft_constraints, vector<rational> const& weights):
@ -345,6 +346,9 @@ namespace opt {
}
}
m_upper = wth.get_min_cost();
if (result == l_true) {
m_lower = m_upper;
}
wth.get_model(m_model);
TRACE("opt", tout << "min cost: " << m_upper << "\n";);
wth.reset();
@ -352,7 +356,7 @@ namespace opt {
}
rational get_lower() const {
return rational(0);
return m_lower;
}
rational get_upper() const {