mirror of
https://github.com/Z3Prover/z3
synced 2025-11-03 21:09:11 +00:00
remove lns code
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner
parent
a79400a01b
commit
c4ff5c7ac7
6 changed files with 3 additions and 266 deletions
|
|
@ -5,7 +5,6 @@ z3_add_component(opt
|
|||
mss.cpp
|
||||
opt_cmds.cpp
|
||||
opt_context.cpp
|
||||
opt_lns.cpp
|
||||
opt_pareto.cpp
|
||||
opt_parse.cpp
|
||||
optsmt.cpp
|
||||
|
|
|
|||
|
|
@ -254,9 +254,6 @@ namespace opt {
|
|||
if (m_pareto) {
|
||||
return execute_pareto();
|
||||
}
|
||||
if (m_lns) {
|
||||
return execute_lns();
|
||||
}
|
||||
if (m_box_index != UINT_MAX) {
|
||||
return execute_box();
|
||||
}
|
||||
|
|
@ -276,9 +273,6 @@ namespace opt {
|
|||
|
||||
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);
|
||||
|
|
@ -311,9 +305,6 @@ 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();
|
||||
}
|
||||
|
|
@ -536,12 +527,8 @@ namespace opt {
|
|||
}
|
||||
|
||||
void context::yield() {
|
||||
if (m_pareto) {
|
||||
m_pareto->get_model(m_model, m_labels);
|
||||
}
|
||||
else if (m_lns) {
|
||||
m_lns->get_model(m_model, m_labels);
|
||||
}
|
||||
SASSERT (m_pareto);
|
||||
m_pareto->get_model(m_model, m_labels);
|
||||
update_bound(true);
|
||||
update_bound(false);
|
||||
}
|
||||
|
|
@ -560,19 +547,6 @@ 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()) {
|
||||
|
|
@ -1020,23 +994,6 @@ 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;
|
||||
|
|
@ -1401,7 +1358,6 @@ namespace opt {
|
|||
|
||||
void context::clear_state() {
|
||||
m_pareto = nullptr;
|
||||
m_lns = nullptr;
|
||||
m_box_index = UINT_MAX;
|
||||
m_model.reset();
|
||||
}
|
||||
|
|
|
|||
|
|
@ -27,7 +27,6 @@ Notes:
|
|||
#include "opt/opt_solver.h"
|
||||
#include "opt/opt_pareto.h"
|
||||
#include "opt/optsmt.h"
|
||||
#include "opt/opt_lns.h"
|
||||
#include "opt/maxsmt.h"
|
||||
#include "cmd_context/cmd_context.h"
|
||||
|
||||
|
|
@ -147,7 +146,6 @@ namespace opt {
|
|||
ref<solver> m_solver;
|
||||
ref<solver> m_sat_solver;
|
||||
scoped_ptr<pareto_base> m_pareto;
|
||||
scoped_ptr<lns> m_lns;
|
||||
scoped_ptr<qe::qmax> m_qmax;
|
||||
sref_vector<model> m_box_models;
|
||||
unsigned m_box_index;
|
||||
|
|
@ -234,8 +232,6 @@ namespace opt {
|
|||
|
||||
virtual bool verify_model(unsigned id, model* mdl, rational const& v);
|
||||
|
||||
void get_lns_literals(expr_ref_vector& lits);
|
||||
|
||||
private:
|
||||
lbool execute(objective const& obj, bool committed, bool scoped);
|
||||
lbool execute_min_max(unsigned index, bool committed, bool scoped, bool is_max);
|
||||
|
|
@ -243,7 +239,6 @@ namespace opt {
|
|||
lbool execute_lex();
|
||||
lbool execute_box();
|
||||
lbool execute_pareto();
|
||||
lbool execute_lns();
|
||||
lbool adjust_unknown(lbool r);
|
||||
bool scoped_lex();
|
||||
expr_ref to_expr(inf_eps const& n);
|
||||
|
|
|
|||
|
|
@ -1,145 +0,0 @@
|
|||
/*++
|
||||
Copyright (c) 2018 Microsoft Corporation
|
||||
|
||||
Module Name:
|
||||
|
||||
opt_lns.cpp
|
||||
|
||||
Abstract:
|
||||
|
||||
Large neighborhood search default implementation
|
||||
based on phase saving and assumptions
|
||||
|
||||
Author:
|
||||
|
||||
Nikolaj Bjorner (nbjorner) 2018-3-13
|
||||
|
||||
--*/
|
||||
|
||||
#include "ast/ast_pp.h"
|
||||
#include "opt/opt_lns.h"
|
||||
#include "opt/opt_context.h"
|
||||
|
||||
namespace opt {
|
||||
|
||||
lns::lns(context& ctx, solver* s):
|
||||
m(ctx.get_manager()),
|
||||
m_ctx(ctx),
|
||||
m_solver(s),
|
||||
m_models_trail(m),
|
||||
m_atoms(m)
|
||||
{}
|
||||
|
||||
lns::~lns() {}
|
||||
|
||||
void lns::display(std::ostream & out) const {
|
||||
for (auto const& q : m_queue) {
|
||||
expr_ref tmp(mk_and(q.m_assignment));
|
||||
out << q.m_index << ": " << tmp << "\n";
|
||||
}
|
||||
}
|
||||
|
||||
lbool lns::operator()() {
|
||||
if (m_queue.empty()) {
|
||||
expr_ref_vector lits(m), atoms(m);
|
||||
m_ctx.get_lns_literals(lits);
|
||||
for (expr* l : lits) {
|
||||
expr* nl = nullptr;
|
||||
if (m.is_not(l, nl)) {
|
||||
m_atoms.push_back(nl);
|
||||
}
|
||||
else {
|
||||
atoms.push_back(l);
|
||||
m_atoms.push_back(l);
|
||||
}
|
||||
}
|
||||
m_queue.push_back(queue_elem(atoms));
|
||||
m_qhead = 0;
|
||||
}
|
||||
|
||||
params_ref p;
|
||||
p.set_uint("inprocess.max", 3ul);
|
||||
m_solver->updt_params(p);
|
||||
|
||||
while (m_qhead < m_queue.size()) {
|
||||
obj_hashtable<expr> atoms;
|
||||
for (expr* f : m_queue[m_qhead].m_assignment) {
|
||||
atoms.insert(f);
|
||||
}
|
||||
unsigned& index = m_queue[m_qhead].m_index;
|
||||
expr* lit = nullptr;
|
||||
for (; index < m_atoms.size(); ++index) {
|
||||
lit = m_atoms[index].get();
|
||||
if (!atoms.contains(lit) && !m_failed.contains(lit)) break;
|
||||
}
|
||||
if (index == m_atoms.size()) {
|
||||
m_qhead++;
|
||||
continue;
|
||||
}
|
||||
|
||||
IF_VERBOSE(2, verbose_stream() << "(opt.lns :queue " << m_qhead << " :index " << index << ")\n");
|
||||
|
||||
p.set_uint("local_search_threads", 0);
|
||||
p.set_uint("unit_walk_threads", 0);
|
||||
m_solver->updt_params(p);
|
||||
|
||||
// recalibrate state to an initial satisfying assignment
|
||||
lbool is_sat = m_solver->check_sat(m_queue[m_qhead].m_assignment);
|
||||
IF_VERBOSE(2, verbose_stream() << "(opt.lns :calibrate-status " << is_sat << ")\n");
|
||||
if (!m.limit().inc()) {
|
||||
return l_undef;
|
||||
}
|
||||
|
||||
expr_ref_vector lits(m);
|
||||
lits.push_back(lit);
|
||||
++index;
|
||||
|
||||
// freeze phase in both SAT solver and local search to current assignment
|
||||
p.set_uint("inprocess.max", 5);
|
||||
p.set_bool("phase.sticky", true);
|
||||
p.set_uint("local_search_threads", 1);
|
||||
p.set_uint("max_conflicts", 100000);
|
||||
//p.set_uint("unit_walk_threads", 1);
|
||||
m_solver->updt_params(p);
|
||||
|
||||
is_sat = m_solver->check_sat(lits);
|
||||
IF_VERBOSE(2, verbose_stream() << "(opt.lns :lookahead-status " << is_sat << " " << mk_pp(lit, m) << ")\n");
|
||||
if (is_sat == l_true && add_assignment()) {
|
||||
return l_true;
|
||||
}
|
||||
if (is_sat == l_false) {
|
||||
m_failed.insert(lit);
|
||||
expr_ref nlit(m.mk_not(lit), m);
|
||||
m_solver->assert_expr(nlit);
|
||||
}
|
||||
if (!m.limit().inc()) {
|
||||
return l_undef;
|
||||
}
|
||||
}
|
||||
return l_false;
|
||||
}
|
||||
|
||||
bool lns::add_assignment() {
|
||||
model_ref mdl;
|
||||
m_solver->get_model(mdl);
|
||||
m_ctx.fix_model(mdl);
|
||||
expr_ref tmp(m);
|
||||
expr_ref_vector fmls(m);
|
||||
for (expr* f : m_atoms) {
|
||||
mdl->eval(f, tmp);
|
||||
if (m.is_true(tmp)) {
|
||||
fmls.push_back(f);
|
||||
}
|
||||
}
|
||||
tmp = mk_and(fmls);
|
||||
if (m_models.contains(tmp)) {
|
||||
return false;
|
||||
}
|
||||
else {
|
||||
m_models.insert(tmp);
|
||||
m_models_trail.push_back(tmp);
|
||||
return true;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -1,68 +0,0 @@
|
|||
/*++
|
||||
Copyright (c) 2018 Microsoft Corporation
|
||||
|
||||
Module Name:
|
||||
|
||||
opt_lns.h
|
||||
|
||||
Abstract:
|
||||
|
||||
Large neighborhood seearch
|
||||
|
||||
Author:
|
||||
|
||||
Nikolaj Bjorner (nbjorner) 2018-3-13
|
||||
|
||||
Notes:
|
||||
|
||||
|
||||
--*/
|
||||
#ifndef OPT_LNS_H_
|
||||
#define OPT_LNS_H_
|
||||
|
||||
#include "solver/solver.h"
|
||||
#include "model/model.h"
|
||||
|
||||
namespace opt {
|
||||
|
||||
class context;
|
||||
|
||||
class lns {
|
||||
struct queue_elem {
|
||||
expr_ref_vector m_assignment;
|
||||
unsigned m_index;
|
||||
queue_elem(expr_ref_vector& assign):
|
||||
m_assignment(assign),
|
||||
m_index(0)
|
||||
{}
|
||||
};
|
||||
ast_manager& m;
|
||||
context& m_ctx;
|
||||
ref<solver> m_solver;
|
||||
model_ref m_model;
|
||||
svector<symbol> m_labels;
|
||||
vector<queue_elem> m_queue;
|
||||
unsigned m_qhead;
|
||||
expr_ref_vector m_models_trail;
|
||||
expr_ref_vector m_atoms;
|
||||
obj_hashtable<expr> m_models;
|
||||
obj_hashtable<expr> m_failed;
|
||||
|
||||
bool add_assignment();
|
||||
public:
|
||||
lns(context& ctx, solver* s);
|
||||
|
||||
~lns();
|
||||
|
||||
void display(std::ostream & out) const;
|
||||
|
||||
lbool operator()();
|
||||
|
||||
void get_model(model_ref& mdl, svector<symbol>& labels) {
|
||||
mdl = m_model;
|
||||
labels = m_labels;
|
||||
}
|
||||
};
|
||||
}
|
||||
|
||||
#endif
|
||||
|
|
@ -3,7 +3,7 @@ def_module_params('opt',
|
|||
export=True,
|
||||
params=(('optsmt_engine', SYMBOL, 'basic', "select optimization engine: 'basic', 'farkas', 'symba'"),
|
||||
('maxsat_engine', SYMBOL, 'maxres', "select engine for maxsat: 'core_maxsat', 'wmax', 'maxres', 'pd-maxres'"),
|
||||
('priority', SYMBOL, 'lex', "select how to priortize objectives: 'lex' (lexicographic), 'pareto', 'box', or 'lns' (large neighborhood search)"),
|
||||
('priority', SYMBOL, 'lex', "select how to priortize objectives: 'lex' (lexicographic), 'pareto', 'box'"),
|
||||
('dump_benchmarks', BOOL, False, 'dump benchmarks for profiling'),
|
||||
('timeout', UINT, UINT_MAX, 'timeout (in milliseconds) (UINT_MAX and 0 mean no timeout)'),
|
||||
('rlimit', UINT, 0, 'resource limit (0 means no limit)'),
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue