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add model correction

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2016-04-29 19:08:10 -07:00
parent c75fd02c95
commit 2428bf18f1
11 changed files with 156 additions and 65 deletions
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56
src/qe/qe_arith.cpp
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@ -965,37 +965,57 @@ namespace qe {
typedef opt::model_based_opt::var var;
typedef vector<var> vars;
opt::bound_type maximize(expr_ref_vector const& fmls, model& mdl, app* t, expr_ref& value, expr_ref& bound) {
opt::inf_eps maximize(expr_ref_vector const& fmls, model& mdl, app* t, expr_ref& bound) {
opt::model_based_opt mbo;
opt::inf_eps value;
obj_map<expr, rational> ts;
obj_map<expr, unsigned> tids;
vars coeffs;
rational c(0), mul(1);
linearize(mdl, mul, t, c, ts);
linearize(mdl, mul, t, c, ts);
extract_coefficients(ts, tids, coeffs);
mbo.set_objective(coeffs, c);
for (unsigned i = 0; i < fmls.size(); ++i) {
linearize(mdl, mbo, fmls[i], tids);
}
rational val;
opt::bound_type result = mbo.maximize(val);
value = a.mk_numeral(val, false);
switch (result) {
case opt::unbounded:
value = mbo.maximize();
expr_ref val(a.mk_numeral(value.get_rational(), false), m);
if (!value.is_finite()) {
bound = m.mk_false();
break;
case opt::strict:
bound = a.mk_le(value, t);
break;
case opt::non_strict:
bound = a.mk_lt(value, t);
break;
return value;
}
// update model
ptr_vector<expr> vars;
obj_map<expr, unsigned>::iterator it = tids.begin(), end = tids.end();
for (; it != end; ++it) {
expr* e = it->m_key;
if (is_uninterp_const(e)) {
unsigned id = it->m_value;
func_decl* f = to_app(e)->get_decl();
expr_ref val(a.mk_numeral(mbo.get_value(id), false), m);
mdl.register_decl(f, val);
}
else {
TRACE("qe", tout << "omitting model update for non-uninterpreted constant " << mk_pp(e, m) << "\n";);
}
}
if (value.get_infinitesimal().is_neg()) {
bound = a.mk_le(val, t);
}
else {
bound = a.mk_lt(val, t);
}
return result;
return value;
}
void extract_coefficients(obj_map<expr, rational> const& ts, obj_map<expr, unsigned>& tids, vars& coeffs) {
@ -1033,8 +1053,8 @@ namespace qe {
return m_imp->a.get_family_id();
}
opt::bound_type arith_project_plugin::maximize(expr_ref_vector const& fmls, model& mdl, app* t, expr_ref& value, expr_ref& bound) {
return m_imp->maximize(fmls, mdl, t, value, bound);
opt::inf_eps arith_project_plugin::maximize(expr_ref_vector const& fmls, model& mdl, app* t, expr_ref& bound) {
return m_imp->maximize(fmls, mdl, t, bound);
}
bool arith_project(model& model, app* var, expr_ref_vector& lits) {