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some extensions/modifications. versions added.

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This commit is contained in:
Andreas Froehlich 2014-02-18 14:01:47 +00:00 • committed by Christoph M. Wintersteiger
parent c982f87025
commit dfe2d945e9
6 changed files with 872 additions and 682 deletions
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2
src/tactic/portfolio/default_tactic.cpp
View file

@ -32,7 +32,7 @@ Notes:
tactic * mk_default_tactic(ast_manager & m, params_ref const & p) {
tactic * st = using_params(and_then(mk_simplify_tactic(m),
cond(mk_is_qfbv_probe(), mk_qfbv_tactic(m),
cond(mk_is_qfbv_probe(), mk_qfbv_sls_tactic(m),
cond(mk_is_qflia_probe(), mk_qflia_tactic(m),
cond(mk_is_qflra_probe(), mk_qflra_tactic(m),
cond(mk_is_qfnra_probe(), mk_qfnra_tactic(m),

243
src/tactic/sls/sls_evaluator.h
View file

@ -20,8 +20,6 @@ Notes:
#ifndef _SLS_EVALUATOR_H_
#define _SLS_EVALUATOR_H_
#include"model_evaluator.h"
#include"sls_powers.h"
#include"sls_tracker.h"
@ -36,7 +34,6 @@ class sls_evaluator {
powers & m_powers;
expr_ref_buffer m_temp_exprs;
vector<ptr_vector<expr> > m_traversal_stack;
vector<ptr_vector<expr> > m_traversal_stack_bool;
public:
sls_evaluator(ast_manager & m, bv_util & bvu, sls_tracker & t, unsynch_mpz_manager & mm, powers & p) :
@ -96,7 +93,7 @@ public:
SASSERT(n_args == 1);
const mpz & child = m_tracker.get_value(args[0]);
SASSERT(m_mpz_manager.is_one(child) || m_mpz_manager.is_zero(child));
m_mpz_manager.set(result, (m_mpz_manager.is_zero(child)) ? m_one : m_zero);
m_mpz_manager.set(result, (m_mpz_manager.is_zero(child)) ? m_one : m_zero);
break;
}
case OP_EQ: {
@ -522,64 +519,11 @@ public:
}
}
void run_serious_update(unsigned cur_depth) {
// precondition: m_traversal_stack contains the entry point(s)
expr_fast_mark1 visited;
mpz new_value;
double new_score;
SASSERT(cur_depth < m_traversal_stack.size());
while (cur_depth != static_cast<unsigned>(-1)) {
ptr_vector<expr> & cur_depth_exprs = m_traversal_stack[cur_depth];
for (unsigned i = 0; i < cur_depth_exprs.size(); i++) {
expr * cur = cur_depth_exprs[i];
(*this)(to_app(cur), new_value);
m_tracker.set_value(cur, new_value);
new_score = m_tracker.score(cur);
if (m_tracker.is_top_expr(cur))
{
m_tracker.adapt_top_sum(cur, new_score, m_tracker.get_score(cur));
if (m_mpz_manager.eq(new_value,m_one))
m_tracker.make_assertion(cur);
else
m_tracker.break_assertion(cur);
}
m_tracker.set_score(cur, new_score);
m_tracker.set_score_prune(cur, new_score);
if (m_tracker.has_uplinks(cur)) {
ptr_vector<expr> & ups = m_tracker.get_uplinks(cur);
for (unsigned j = 0; j < ups.size(); j++) {
expr * next = ups[j];
unsigned next_d = m_tracker.get_distance(next);
SASSERT(next_d < cur_depth);
if (!visited.is_marked(next)) {
m_traversal_stack[next_d].push_back(next);
visited.mark(next);
}
}
}
}
cur_depth_exprs.reset();
cur_depth--;
}
m_mpz_manager.del(new_value);
}
void run_update(unsigned cur_depth) {
// precondition: m_traversal_stack contains the entry point(s)
expr_fast_mark1 visited;
mpz new_value;
double new_score;
SASSERT(cur_depth < m_traversal_stack.size());
while (cur_depth != static_cast<unsigned>(-1)) {
ptr_vector<expr> & cur_depth_exprs = m_traversal_stack[cur_depth];
@ -589,10 +533,8 @@ public:
(*this)(to_app(cur), new_value);
m_tracker.set_value(cur, new_value);
new_score = m_tracker.score(cur);
if (m_tracker.is_top_expr(cur))
m_tracker.adapt_top_sum(cur, new_score, m_tracker.get_score(cur));
m_tracker.set_score(cur, new_score);
m_tracker.set_score(cur, m_tracker.score(cur));
if (m_tracker.has_uplinks(cur)) {
ptr_vector<expr> & ups = m_tracker.get_uplinks(cur);
for (unsigned j = 0; j < ups.size(); j++) {
@ -627,7 +569,8 @@ public:
m_traversal_stack[cur_depth].push_back(ep);
if (cur_depth > max_depth) max_depth = cur_depth;
}
run_serious_update(max_depth);
run_update(max_depth);
}
void update(func_decl * fd, const mpz & new_value) {
@ -641,174 +584,36 @@ public:
run_update(cur_depth);
}
void serious_update(func_decl * fd, const mpz & new_value) {
m_tracker.set_value(fd, new_value);
expr * ep = m_tracker.get_entry_point(fd);
unsigned cur_depth = m_tracker.get_distance(ep);
if (m_traversal_stack.size() <= cur_depth)
m_traversal_stack.resize(cur_depth+1);
m_traversal_stack[cur_depth].push_back(ep);
void randomize_local(goal_ref const & g, unsigned int flip) {
ptr_vector<func_decl> & unsat_constants = m_tracker.get_unsat_constants(g, flip);
run_serious_update(cur_depth);
}
// Randomize _all_ candidates:
unsigned run_update_bool_prune(unsigned cur_depth) {
expr_fast_mark1 visited;
//// bool did_something = false;
//for (unsigned i = 0; i < unsat_constants.size(); i++) {
// func_decl * fd = unsat_constants[i];
// mpz temp = m_tracker.get_random(fd->get_range());
// // if (m_mpz_manager.neq(temp, m_tracker.get_value(fd))) {
// // did_something = true;
// // }
// update(fd, temp);
// m_mpz_manager.del(temp);
//}
double prune_score, new_score;
unsigned pot_benefits = 0;
SASSERT(cur_depth < m_traversal_stack_bool.size());
ptr_vector<expr> & cur_depth_exprs = m_traversal_stack_bool[cur_depth];
for (unsigned i = 0; i < cur_depth_exprs.size(); i++) {
expr * cur = cur_depth_exprs[i];
new_score = m_tracker.score(cur);
if (m_tracker.is_top_expr(cur))
m_tracker.adapt_top_sum(cur, new_score, m_tracker.get_score(cur));
prune_score = m_tracker.get_score_prune(cur);
m_tracker.set_score(cur, new_score);
if ((new_score > prune_score) && (m_tracker.has_pos_occ(cur)))
pot_benefits = 1;
if ((new_score <= prune_score) && (m_tracker.has_neg_occ(cur)))
pot_benefits = 1;
if (m_tracker.has_uplinks(cur)) {
ptr_vector<expr> & ups = m_tracker.get_uplinks(cur);
for (unsigned j = 0; j < ups.size(); j++) {
expr * next = ups[j];
unsigned next_d = m_tracker.get_distance(next);
SASSERT(next_d < cur_depth);
if (!visited.is_marked(next)) {
m_traversal_stack_bool[next_d].push_back(next);
visited.mark(next);
}
}
}
}
cur_depth_exprs.reset();
cur_depth--;
while (cur_depth != static_cast<unsigned>(-1)) {
ptr_vector<expr> & cur_depth_exprs = m_traversal_stack_bool[cur_depth];
if (pot_benefits)
{
unsigned cur_size = cur_depth_exprs.size();
for (unsigned i = 0; i < cur_size; i++) {
expr * cur = cur_depth_exprs[i];
new_score = m_tracker.score(cur);
if (m_tracker.is_top_expr(cur))
m_tracker.adapt_top_sum(cur, new_score, m_tracker.get_score(cur));
m_tracker.set_score(cur, new_score);
if (m_tracker.has_uplinks(cur)) {
ptr_vector<expr> & ups = m_tracker.get_uplinks(cur);
for (unsigned j = 0; j < ups.size(); j++) {
expr * next = ups[j];
unsigned next_d = m_tracker.get_distance(next);
SASSERT(next_d < cur_depth);
if (!visited.is_marked(next)) {
m_traversal_stack_bool[next_d].push_back(next);
visited.mark(next);
}
}
}
}
}
cur_depth_exprs.reset();
cur_depth--;
}
return pot_benefits;
}
void run_update_prune(unsigned max_depth) {
// precondition: m_traversal_stack contains the entry point(s)
expr_fast_mark1 visited;
mpz new_value;
unsigned cur_depth = max_depth;
SASSERT(cur_depth < m_traversal_stack.size());
while (cur_depth != static_cast<unsigned>(-1)) {
ptr_vector<expr> & cur_depth_exprs = m_traversal_stack[cur_depth];
for (unsigned i = 0; i < cur_depth_exprs.size(); i++) {
expr * cur = cur_depth_exprs[i];
(*this)(to_app(cur), new_value);
m_tracker.set_value(cur, new_value);
// Andreas: Should actually always have uplinks ...
if (m_tracker.has_uplinks(cur)) {
ptr_vector<expr> & ups = m_tracker.get_uplinks(cur);
for (unsigned j = 0; j < ups.size(); j++) {
expr * next = ups[j];
unsigned next_d = m_tracker.get_distance(next);
SASSERT(next_d < cur_depth);
if (!visited.is_marked(next)) {
if (m_manager.is_bool(next))
m_traversal_stack_bool[max_depth].push_back(next);
else
m_traversal_stack[next_d].push_back(next);
visited.mark(next);
}
}
}
}
cur_depth_exprs.reset();
cur_depth--;
}
m_mpz_manager.del(new_value);
}
unsigned update_prune(func_decl * fd, const mpz & new_value) {
m_tracker.set_value(fd, new_value);
expr * ep = m_tracker.get_entry_point(fd);
unsigned cur_depth = m_tracker.get_distance(ep);
if (m_traversal_stack_bool.size() <= cur_depth)
m_traversal_stack_bool.resize(cur_depth+1);
if (m_traversal_stack.size() <= cur_depth)
m_traversal_stack.resize(cur_depth+1);
if (m_manager.is_bool(ep))
m_traversal_stack_bool[cur_depth].push_back(ep);
else
{
m_traversal_stack[cur_depth].push_back(ep);
run_update_prune(cur_depth);
}
return run_update_bool_prune(cur_depth);
}
void randomize_local(ptr_vector<func_decl> & unsat_constants) {
// Randomize _one_ candidate:
unsigned r = m_tracker.get_random_uint(16) % unsat_constants.size();
func_decl * fd = unsat_constants[r];
mpz temp = m_tracker.get_random(fd->get_range());
serious_update(fd, temp);
update(fd, temp);
m_mpz_manager.del(temp);
TRACE("sls", tout << "Randomization candidate: " << unsat_constants[r]->get_name() << std::endl;
TRACE("sls", /*tout << "Randomization candidates: ";
for (unsigned i = 0; i < unsat_constants.size(); i++)
tout << unsat_constants[i]->get_name() << ", ";
tout << std::endl;*/
tout << "Randomization candidate: " << unsat_constants[r]->get_name() << std::endl;
tout << "Locally randomized model: " << std::endl;
m_tracker.show_model(tout); );
}
void randomize_local(expr * e) {
randomize_local(m_tracker.get_constants(e));
}
void randomize_local(ptr_vector<expr> const & as) {
randomize_local(m_tracker.get_unsat_constants(as));
}
};

661
src/tactic/sls/sls_tactic.cpp
View file

@ -16,30 +16,619 @@ Author:
Notes:
--*/
#include<iomanip>
#include"map.h"
#include"nnf.h"
#include"cooperate.h"
#include"ast_smt2_pp.h"
#include"ast_pp.h"
#include"var_subst.h"
#include"model_pp.h"
#include"model_evaluator.h"
#include"solve_eqs_tactic.h"
#include"elim_uncnstr_tactic.h"
#include"bv_size_reduction_tactic.h"
#include"max_bv_sharing_tactic.h"
#include"simplify_tactic.h"
#include"propagate_values_tactic.h"
#include"ctx_simplify_tactic.h"
#include"elim_uncnstr_tactic.h"
#include"nnf_tactic.h"
#include"stopwatch.h"
#include"propagate_values_tactic.h"
#include"sls_tactic.h"
#include"sls_params.hpp"
#include"sls_engine.h"
#include"nnf_tactic.h"
class sls_tactic : public tactic {
#define _CNF_ 0
#define _BFS_ 1
#define _FOCUS_ 1
#define _RESTARTS_ 0
#define _TIMELIMIT_ 30
#define _SCORE_AND_AVG_ 0
#define _SCORE_OR_MUL_ 0
#define _VNS_ 0
#define _WEIGHT_DIST_ 3
#define _WEIGHT_DIST_FACTOR_ 0.1
#include"sls_params.hpp"
#include"sls_evaluator.h"
#include"sls_tracker.h"
class sls_tactic : public tactic {
class stats {
public:
unsigned m_restarts;
stopwatch m_stopwatch;
unsigned m_full_evals;
unsigned m_incr_evals;
unsigned m_moves, m_flips, m_incs, m_decs, m_invs;
stats() :
m_restarts(0),
m_full_evals(0),
m_incr_evals(0),
m_moves(0),
m_flips(0),
m_incs(0),
m_decs(0),
m_invs(0) {
m_stopwatch.reset();
m_stopwatch.start();
}
void reset() {
m_full_evals = m_flips = m_incr_evals = 0;
m_stopwatch.reset();
m_stopwatch.start();
}
};
struct imp {
ast_manager & m_manager;
stats & m_stats;
unsynch_mpz_manager m_mpz_manager;
powers m_powers;
mpz m_zero, m_one, m_two;
bool m_produce_models;
volatile bool m_cancel;
bv_util m_bv_util;
sls_tracker m_tracker;
sls_evaluator m_evaluator;
unsigned m_max_restarts;
unsigned m_plateau_limit;
typedef enum { MV_FLIP = 0, MV_INC, MV_DEC, MV_INV } move_type;
imp(ast_manager & m, params_ref const & p, stats & s) :
m_manager(m),
m_stats(s),
m_powers(m_mpz_manager),
m_zero(m_mpz_manager.mk_z(0)),
m_one(m_mpz_manager.mk_z(1)),
m_two(m_mpz_manager.mk_z(2)),
m_cancel(false),
m_bv_util(m),
m_tracker(m, m_bv_util, m_mpz_manager, m_powers),
m_evaluator(m, m_bv_util, m_tracker, m_mpz_manager, m_powers)
{
updt_params(p);
}
~imp() {
m_mpz_manager.del(m_zero);
m_mpz_manager.del(m_one);
m_mpz_manager.del(m_two);
}
ast_manager & m() const { return m_manager; }
void set_cancel(bool f) { m_cancel = f; }
void cancel() { set_cancel(true); }
void reset_cancel() { set_cancel(false); }
static void collect_param_descrs(param_descrs & r) {
sls_params::collect_param_descrs(r);
}
void updt_params(params_ref const & _p) {
sls_params p(_p);
m_produce_models = _p.get_bool("model", false);
m_max_restarts = p.restarts();
m_tracker.set_random_seed(p.random_seed());
m_plateau_limit = p.plateau_limit();
}
void checkpoint() {
if (m_cancel)
throw tactic_exception(TACTIC_CANCELED_MSG);
cooperate("sls");
}
bool full_eval(goal_ref const & g, model & mdl) {
bool res = true;
unsigned sz = g->size();
for (unsigned i = 0; i < sz && res; i++) {
checkpoint();
expr_ref o(m_manager);
if (!mdl.eval(g->form(i), o, true))
exit(ERR_INTERNAL_FATAL);
res = m_manager.is_true(o.get());
}
TRACE("sls", tout << "Evaluation: " << res << std::endl;);
return res;
}
double top_score(goal_ref const & g) {
#if 0
double min = m_tracker.get_score(g->form(0));
unsigned sz = g->size();
for (unsigned i = 1; i < sz; i++) {
double q = m_tracker.get_score(g->form(i));
if (q < min) min = q;
}
TRACE("sls_top", tout << "Score distribution:";
for (unsigned i = 0; i < sz; i++)
tout << " " << m_tracker.get_score(g->form(i));
tout << " MIN: " << min << std::endl; );
return min;
#else
double top_sum = 0.0;
unsigned sz = g->size();
for (unsigned i = 0; i < sz; i++) {
top_sum += m_tracker.get_score(g->form(i));
}
TRACE("sls_top", tout << "Score distribution:";
for (unsigned i = 0; i < sz; i++)
tout << " " << m_tracker.get_score(g->form(i));
tout << " AVG: " << top_sum / (double) sz << std::endl; );
return top_sum / (double) sz;
#endif
}
double rescore(goal_ref const & g) {
m_evaluator.update_all();
m_stats.m_full_evals++;
return top_score(g);
}
double incremental_score(goal_ref const & g, func_decl * fd, const mpz & new_value) {
m_evaluator.update(fd, new_value);
m_stats.m_incr_evals++;
return top_score(g);
}
bool what_if(goal_ref const & g, func_decl * fd, const unsigned & fd_inx, const mpz & temp,
double & best_score, unsigned & best_const, mpz & best_value) {
#ifdef Z3DEBUG
mpz old_value;
m_mpz_manager.set(old_value, m_tracker.get_value(fd));
#endif
double r = incremental_score(g, fd, temp);
#ifdef Z3DEBUG
TRACE("sls_whatif", tout << "WHAT IF " << fd->get_name() << " WERE " << m_mpz_manager.to_string(temp) <<
" --> " << r << std::endl; );
m_mpz_manager.del(old_value);
#endif
if (r >= best_score) {
best_score = r;
best_const = fd_inx;
m_mpz_manager.set(best_value, temp);
return true;
}
return false;
}
void mk_inc(unsigned bv_sz, const mpz & old_value, mpz & incremented) {
unsigned shift;
m_mpz_manager.add(old_value, m_one, incremented);
if (m_mpz_manager.is_power_of_two(incremented, shift) && shift == bv_sz)
m_mpz_manager.set(incremented, m_zero);
}
void mk_dec(unsigned bv_sz, const mpz & old_value, mpz & decremented) {
if (m_mpz_manager.is_zero(old_value)) {
m_mpz_manager.set(decremented, m_powers(bv_sz));
m_mpz_manager.dec(decremented);
}
else
m_mpz_manager.sub(old_value, m_one, decremented);
}
void mk_inv(unsigned bv_sz, const mpz & old_value, mpz & inverted) {
m_mpz_manager.bitwise_not(bv_sz, old_value, inverted);
}
void mk_flip(sort * s, const mpz & old_value, unsigned bit, mpz & flipped) {
m_mpz_manager.set(flipped, m_zero);
if (m_bv_util.is_bv_sort(s)) {
mpz mask;
m_mpz_manager.set(mask, m_powers(bit));
m_mpz_manager.bitwise_xor(old_value, mask, flipped);
m_mpz_manager.del(mask);
}
else if (m_manager.is_bool(s))
m_mpz_manager.set(flipped, (m_mpz_manager.is_zero(old_value)) ? m_one : m_zero);
else
NOT_IMPLEMENTED_YET();
}
void mk_random_move(goal_ref const & g) {
unsigned rnd_mv = 0;
if (m_mpz_manager.is_one(m_tracker.get_random_bool())) rnd_mv=2;
if (m_mpz_manager.is_one(m_tracker.get_random_bool())) rnd_mv++;
move_type mt = (move_type) rnd_mv;
// inversion doesn't make sense, let's do a flip instead.
if (mt == MV_INV) mt = MV_FLIP;
ptr_vector<func_decl> & unsat_constants = m_tracker.get_unsat_constants(g, m_stats.m_moves);
unsigned ucc = unsat_constants.size();
unsigned rc = (m_tracker.get_random_uint((ucc < 16) ? 4 : (ucc < 256) ? 8 : (ucc < 4096) ? 12 : (ucc < 65536) ? 16 : 32)) % ucc;
func_decl * fd = unsat_constants[rc];
mpz new_value;
unsigned bit = 0;
switch (mt)
{
case MV_FLIP: {
unsigned bv_sz = m_bv_util.get_bv_size(fd->get_range());
bit = (m_tracker.get_random_uint((bv_sz < 16) ? 4 : (bv_sz < 256) ? 8 : (bv_sz < 4096) ? 12 : (bv_sz < 65536) ? 16 : 32)) % bv_sz;
mk_flip(fd->get_range(), m_tracker.get_value(fd), bit, new_value);
break;
}
case MV_INC:
mk_inc(m_bv_util.get_bv_size(fd->get_range()), m_tracker.get_value(fd), new_value);
break;
case MV_DEC:
mk_dec(m_bv_util.get_bv_size(fd->get_range()), m_tracker.get_value(fd), new_value);
break;
case MV_INV:
mk_inv(m_bv_util.get_bv_size(fd->get_range()), m_tracker.get_value(fd), new_value);
break;
default:
NOT_IMPLEMENTED_YET();
}
m_evaluator.update(fd, new_value);
TRACE("sls", tout << "Randomization candidates: ";
for (unsigned i = 0; i < unsat_constants.size(); i++)
tout << unsat_constants[i]->get_name() << ", ";
tout << std::endl;
tout << "Random move: ";
switch (mt) {
case MV_FLIP: tout << "Flip #" << bit << " in " << fd->get_name() << std::endl; break;
case MV_INC: tout << "+1 for " << fd->get_name() << std::endl; break;
case MV_DEC: tout << "-1 for " << fd->get_name() << std::endl; break;
case MV_INV: tout << "NEG for " << fd->get_name() << std::endl; break;
}
tout << "Locally randomized model: " << std::endl; m_tracker.show_model(tout); );
m_mpz_manager.del(new_value);
}
double find_best_move_vns(goal_ref const & g, ptr_vector<func_decl> & to_evaluate, double score,
unsigned & best_const, mpz & best_value, unsigned & new_bit, move_type & move) {
mpz old_value, temp;
unsigned bv_sz, max_bv_sz = 0;
double new_score = score;
for (unsigned i = 0; i < to_evaluate.size() && new_score < 1.0 ; i++) {
func_decl * fd = to_evaluate[i];
sort * srt = fd->get_range();
bv_sz = (m_manager.is_bool(srt)) ? 1 : m_bv_util.get_bv_size(srt);
if (max_bv_sz < bv_sz) max_bv_sz = bv_sz;
m_mpz_manager.set(old_value, m_tracker.get_value(fd));
if (m_bv_util.is_bv_sort(srt) && bv_sz > 1) {
if (!m_mpz_manager.is_even(old_value)) {
// for odd values, try +1
mk_inc(bv_sz, old_value, temp);
if (what_if(g, fd, i, temp, new_score, best_const, best_value))
move = MV_INC;
}
else {
// for even values, try -1
mk_dec(bv_sz, old_value, temp);
if (what_if(g, fd, i, temp, new_score, best_const, best_value))
move = MV_DEC;
}
// try inverting
mk_inv(bv_sz, old_value, temp);
if (what_if(g, fd, i, temp, new_score, best_const, best_value))
move = MV_INV;
// try to flip lsb
mk_flip(srt, old_value, 0, temp);
if (what_if(g, fd, i, temp, new_score, best_const, best_value)) {
new_bit = 0;
move = MV_FLIP;
}
}
// reset to what it was before
double check = incremental_score(g, fd, old_value);
SASSERT(check == score);
}
#if _VNS_ == 1
for (unsigned j = 1; j < max_bv_sz && new_score <= score; j++)
#else
if (new_score <= score)
for (unsigned j = 1; j < max_bv_sz && new_score < 1.0; j++)
#endif
for (unsigned i = 0; i < to_evaluate.size() && new_score < 1.0 ; i++) {
func_decl * fd = to_evaluate[i];
sort * srt = fd->get_range();
bv_sz = (m_manager.is_bool(srt)) ? 1 : m_bv_util.get_bv_size(srt);
m_mpz_manager.set(old_value, m_tracker.get_value(fd));
// What would happen if we flipped bit #j ?
if (j < bv_sz)
{
mk_flip(srt, old_value, j, temp);
if (what_if(g, fd, i, temp, new_score, best_const, best_value)) {
new_bit = j;
move = MV_FLIP;
}
}
// reset to what it was before
double check = incremental_score(g, fd, old_value);
SASSERT(check == score);
}
m_mpz_manager.del(old_value);
m_mpz_manager.del(temp);
return new_score;
}
double find_best_move(goal_ref const & g, ptr_vector<func_decl> & to_evaluate, double score,
unsigned & best_const, mpz & best_value, unsigned & new_bit, move_type & move) {
mpz old_value, temp;
unsigned bv_sz;
double new_score = score;
for (unsigned i = 0; i < to_evaluate.size() && new_score < 1.0 ; i++) {
func_decl * fd = to_evaluate[i];
sort * srt = fd->get_range();
bv_sz = (m_manager.is_bool(srt)) ? 1 : m_bv_util.get_bv_size(srt);
m_mpz_manager.set(old_value, m_tracker.get_value(fd));
// first try to flip every bit
for (unsigned j = 0; j < bv_sz && new_score < 1.0; j++) {
// What would happen if we flipped bit #i ?
mk_flip(srt, old_value, j, temp);
if (what_if(g, fd, i, temp, new_score, best_const, best_value)) {
new_bit = j;
move = MV_FLIP;
}
}
if (m_bv_util.is_bv_sort(srt) && bv_sz > 1) {
if (!m_mpz_manager.is_even(old_value)) {
// for odd values, try +1
mk_inc(bv_sz, old_value, temp);
if (what_if(g, fd, i, temp, new_score, best_const, best_value))
move = MV_INC;
}
else {
// for even values, try -1
mk_dec(bv_sz, old_value, temp);
if (what_if(g, fd, i, temp, new_score, best_const, best_value))
move = MV_DEC;
}
// try inverting
mk_inv(bv_sz, old_value, temp);
if (what_if(g, fd, i, temp, new_score, best_const, best_value))
move = MV_INV;
}
// reset to what it was before
double check = incremental_score(g, fd, old_value);
SASSERT(check == score);
}
m_mpz_manager.del(old_value);
m_mpz_manager.del(temp);
return new_score;
}
lbool search(goal_ref const & g) {
lbool res = l_undef;
double score = 0.0, old_score = 0.0;
unsigned new_const = (unsigned)-1, new_bit = 0;
mpz new_value;
move_type move;
score = rescore(g);
TRACE("sls", tout << "Starting search, initial score = " << std::setprecision(32) << score << std::endl;
tout << "Score distribution:";
for (unsigned i = 0; i < g->size(); i++)
tout << " " << std::setprecision(3) << m_tracker.get_score(g->form(i));
tout << " TOP: " << score << std::endl; );
unsigned plateau_cnt = 0;
// Andreas: Why do we only allow so few plateaus?
#if _RESTARTS_
while (plateau_cnt < m_plateau_limit && m_stats.m_stopwatch.get_current_seconds() < _TIMELIMIT_) {
#else
while (m_stats.m_stopwatch.get_current_seconds() < _TIMELIMIT_) {
#endif
do {
checkpoint();
old_score = score;
new_const = (unsigned)-1;
ptr_vector<func_decl> & to_evaluate = m_tracker.get_unsat_constants(g, m_stats.m_moves);
TRACE("sls_constants", tout << "Evaluating these constants: " << std::endl;
for (unsigned i = 0 ; i < to_evaluate.size(); i++)
tout << to_evaluate[i]->get_name() << std::endl; );
#if _VNS_
score = find_best_move_vns(g, to_evaluate, score, new_const, new_value, new_bit, move);
#else
score = find_best_move(g, to_evaluate, score, new_const, new_value, new_bit, move);
#endif
if (new_const == static_cast<unsigned>(-1)) {
TRACE("sls", tout << "Local maximum reached; unsatisfied constraints: " << std::endl;
for (unsigned i = 0; i < g->size(); i++) {
if (!m_mpz_manager.is_one(m_tracker.get_value(g->form(i))))
tout << mk_ismt2_pp(g->form(i), m_manager) << std::endl;
});
TRACE("sls_max", m_tracker.show_model(tout);
tout << "Scores: " << std::endl;
for (unsigned i = 0; i < g->size(); i++)
tout << mk_ismt2_pp(g->form(i), m_manager) << " ---> " <<
m_tracker.get_score(g->form(i)) << std::endl; );
// Andreas: If new_const == -1, shouldn't score = old_score anyway?
score = old_score;
}
else {
// Andreas: Why does randomizing not count as a move? (Now it does.)
m_stats.m_moves++;
func_decl * fd = to_evaluate[new_const];
TRACE("sls", tout << "Setting " << fd->get_name() << " to " << m_mpz_manager.to_string(new_value) << " (Move: ";
switch (move) {
case MV_FLIP:
tout << "Flip";
if (!m_manager.is_bool(fd->get_range())) tout << " #" << new_bit;
break;
case MV_INC:
tout << "+1";
break;
case MV_DEC:
tout << "-1";
break;
case MV_INV:
tout << "NEG";
break;
};
tout << ") ; new score = " << std::setprecision(32) << score << std::endl; );
switch (move) {
case MV_FLIP: m_stats.m_flips++; break;
case MV_INC: m_stats.m_incs++; break;
case MV_DEC: m_stats.m_decs++; break;
case MV_INV: m_stats.m_invs++; break;
}
score = incremental_score(g, fd, new_value);
TRACE("sls", tout << "Score distribution:";
for (unsigned i = 0; i < g->size(); i++)
tout << " " << std::setprecision(3) << m_tracker.get_score(g->form(i));
tout << " TOP: " << score << std::endl; );
}
if (score >= 1.0) {
// score could theoretically be imprecise.
// Andreas: Can it only be imprecise in one direction?
bool all_true = true;
for (unsigned i = 0; i < g->size() && all_true; i++)
if (!m_mpz_manager.is_one(m_tracker.get_value(g->form(i))))
all_true=false;
if (all_true) {
res = l_true; // sat
goto bailout;
} else
TRACE("sls", tout << "Imprecise 1.0 score" << std::endl;);
}
/*
if (m_stats.m_moves % 100 == 0)
{
verbose_stream() << "(" << std::fixed << std::setprecision(10) << score << ")" << std::endl;
verbose_stream() << "(" << std::fixed << std::setprecision(2) << (m_stats.m_moves / m_stats.m_stopwatch.get_current_seconds()) << ")" << std::endl;
}*/
}
while (score > old_score && res == l_undef);
// Andreas: Why do you check for old_score? This should always be equal due to the loop invariant.
if (score != old_score) {
report_tactic_progress("This should not happen I guess.", plateau_cnt);
plateau_cnt = 0;
} else {
m_stats.m_moves++;
plateau_cnt++;
//report_tactic_progress("Plateau.", plateau_cnt);
// Andreas: Right now, a useless assignment is created in case of a restart. But we don't want to use restarts anyway.
//if (plateau_cnt < m_plateau_limit) {
TRACE("sls", tout << "In a plateau (" << plateau_cnt << "/" << m_plateau_limit << "); randomizing locally." << std::endl; );
m_evaluator.randomize_local(g, m_stats.m_moves);
//mk_random_move(g);
score = top_score(g);
//}
}
}
bailout:
m_mpz_manager.del(new_value);
return res;
}
void operator()(goal_ref const & g, model_converter_ref & mc) {
if (g->inconsistent()) {
mc = 0;
return;
}
m_tracker.initialize(g);
lbool res = l_undef;
do {
checkpoint();
// Andreas: I think restarts are too impotant to ignore 99% of them are happening...
//if ((m_stats.m_restarts % 100) == 0)
report_tactic_progress("Searching... restarts left:", m_max_restarts - m_stats.m_restarts);
res = search(g);
if (res == l_undef)
m_tracker.randomize();
}
while (m_stats.m_stopwatch.get_current_seconds() < _TIMELIMIT_ && res != l_true && m_stats.m_restarts++ < m_max_restarts);
verbose_stream() << "(restarts: " << m_stats.m_restarts << " flips: " << m_stats.m_moves << " time: " << std::fixed << std::setprecision(2) << m_stats.m_stopwatch.get_current_seconds() << " fps: " << (m_stats.m_moves / m_stats.m_stopwatch.get_current_seconds()) << ")" << std::endl;
if (res == l_true) {
report_tactic_progress("Number of flips:", m_stats.m_moves);
if (m_produce_models) {
model_ref mdl = m_tracker.get_model();
mc = model2model_converter(mdl.get());
TRACE("sls_model", mc->display(tout); );
}
g->reset();
}
else
mc = 0;
}
};
ast_manager & m;
params_ref m_params;
sls_engine * m_engine;
imp * m_imp;
stats m_stats;
public:
sls_tactic(ast_manager & _m, params_ref const & p):
m(_m),
m_params(p) {
m_engine = alloc(sls_engine, m, p);
m_imp = alloc(imp, m, p, m_stats);
}
virtual tactic * translate(ast_manager & m) {
@ -47,16 +636,16 @@ public:
}
virtual ~sls_tactic() {
dealloc(m_engine);
dealloc(m_imp);
}
virtual void updt_params(params_ref const & p) {
m_params = p;
m_engine->updt_params(p);
m_imp->updt_params(p);
}
virtual void collect_param_descrs(param_descrs & r) {
sls_params::collect_param_descrs(r);
imp::collect_param_descrs(r);
}
virtual void operator()(goal_ref const & g,
@ -64,13 +653,14 @@ public:
model_converter_ref & mc,
proof_converter_ref & pc,
expr_dependency_ref & core) {
SASSERT(g->is_well_sorted());
SASSERT(g->is_well_sorted());
m_imp->m_produce_models = g->models_enabled();
mc = 0; pc = 0; core = 0; result.reset();
TRACE("sls", g->display(tout););
tactic_report report("sls", *g);
m_engine->operator()(g, mc);
m_imp->operator()(g, mc);
g->inc_depth();
result.push_back(g.get());
@ -79,36 +669,35 @@ public:
}
virtual void cleanup() {
sls_engine * d = alloc(sls_engine, m, m_params);
imp * d = alloc(imp, m, m_params, m_stats);
#pragma omp critical (tactic_cancel)
{
std::swap(d, m_engine);
std::swap(d, m_imp);
}
dealloc(d);
}
virtual void collect_statistics(statistics & st) const {
sls_engine::stats const & stats = m_engine->get_stats();
double seconds = stats.m_stopwatch.get_current_seconds();
st.update("sls restarts", stats.m_restarts);
st.update("sls full evals", stats.m_full_evals);
st.update("sls incr evals", stats.m_incr_evals);
st.update("sls incr evals/sec", stats.m_incr_evals / seconds);
st.update("sls FLIP moves", stats.m_flips);
st.update("sls INC moves", stats.m_incs);
st.update("sls DEC moves", stats.m_decs);
st.update("sls INV moves", stats.m_invs);
st.update("sls moves", stats.m_moves);
st.update("sls moves/sec", stats.m_moves / seconds);
double seconds = m_stats.m_stopwatch.get_current_seconds();
st.update("sls restarts", m_stats.m_restarts);
st.update("sls full evals", m_stats.m_full_evals);
st.update("sls incr evals", m_stats.m_incr_evals);
st.update("sls incr evals/sec", m_stats.m_incr_evals/ seconds);
st.update("sls FLIP moves", m_stats.m_flips);
st.update("sls INC moves", m_stats.m_incs);
st.update("sls DEC moves", m_stats.m_decs);
st.update("sls INV moves", m_stats.m_invs);
st.update("sls moves", m_stats.m_moves);
st.update("sls moves/sec", m_stats.m_moves / seconds);
}
virtual void reset_statistics() {
m_engine->reset_statistics();
m_stats.reset();
}
virtual void set_cancel(bool f) {
if (m_engine)
m_engine->set_cancel(f);
if (m_imp)
m_imp->set_cancel(f);
}
};
@ -143,9 +732,6 @@ tactic * mk_preamble(ast_manager & m, params_ref const & p) {
// conservative gaussian elimination.
gaussian_p.set_uint("gaussian_max_occs", 2);
params_ref ctx_p;
ctx_p.set_uint("max_depth", 32);
ctx_p.set_uint("max_steps", 5000000);
return and_then(and_then(mk_simplify_tactic(m),
mk_propagate_values_tactic(m),
using_params(mk_solve_eqs_tactic(m), gaussian_p),
@ -154,12 +740,17 @@ tactic * mk_preamble(ast_manager & m, params_ref const & p) {
using_params(mk_simplify_tactic(m), simp2_p)),
using_params(mk_simplify_tactic(m), hoist_p),
mk_max_bv_sharing_tactic(m),
#if _CNF_
// Andreas: We will probably never use this. CNF sucks.
mk_cnf_tactic(m, p));
#else
// Andreas: How does a NNF actually look like? Can it contain ITE operators?
mk_nnf_tactic(m, p));
#endif
}
tactic * mk_qfbv_sls_tactic(ast_manager & m, params_ref const & p) {
tactic * t = and_then(mk_preamble(m, p), mk_sls_tactic(m));
//tactic * t = and_then(mk_simplify_tactic(m), mk_nnf_tactic(m, p), mk_sls_tactic(m));
t->updt_params(p);
return t;
}

640
src/tactic/sls/sls_tracker.h
View file

@ -20,14 +20,6 @@ Notes:
#ifndef _SLS_TRACKER_H_
#define _SLS_TRACKER_H_
#include"for_each_expr.h"
#include"ast_smt2_pp.h"
#include"bv_decl_plugin.h"
#include"model.h"
#include"sls_params.hpp"
#include"sls_powers.h"
class sls_tracker {
ast_manager & m_manager;
unsynch_mpz_manager & m_mpz_manager;
@ -36,26 +28,21 @@ class sls_tracker {
random_gen m_rng;
unsigned m_random_bits;
unsigned m_random_bits_cnt;
mpz m_zero, m_one, m_two;
mpz m_zero, m_one, m_two;
struct value_score {
value_score() : m(0), value(unsynch_mpz_manager::mk_z(0)), score(0.0), distance(0), touched(1), score_prune(0.0), has_pos_occ(0), has_neg_occ(0) { };
value_score() : m(0), value(unsynch_mpz_manager::mk_z(0)), score(0.0), distance(0) { };
~value_score() { if (m) m->del(value); }
unsynch_mpz_manager * m;
mpz value;
double score;
double score_prune;
unsigned has_pos_occ;
unsigned has_neg_occ;
unsigned distance; // max distance from any root
unsigned touched;
value_score & operator=(const value_score & other) {
SASSERT(m == 0 || m == other.m);
if (m) m->set(value, 0); else m = other.m;
m->set(value, other.value);
score = other.score;
distance = other.distance;
touched = other.touched;
return *this;
}
};
@ -67,29 +54,12 @@ private:
typedef obj_map<expr, value_score> scores_type;
typedef obj_map<expr, ptr_vector<expr> > uplinks_type;
typedef obj_map<expr, ptr_vector<func_decl> > occ_type;
obj_hashtable<expr> m_top_expr;
scores_type m_scores;
uplinks_type m_uplinks;
entry_point_type m_entry_points;
ptr_vector<func_decl> m_constants;
ptr_vector<func_decl> m_temp_constants;
occ_type m_constants_occ;
unsigned m_last_pos;
unsigned m_walksat;
unsigned m_ucb;
double m_ucb_constant;
unsigned m_ucb_init;
double m_ucb_forget;
double m_ucb_noise;
unsigned m_touched;
double m_scale_unsat;
unsigned m_paws_init;
obj_map<expr, unsigned> m_where_false;
expr** m_list_false;
unsigned m_track_unsat;
obj_map<expr, unsigned> m_weights;
double m_top_sum;
obj_hashtable<expr> m_temp_seen;
public:
sls_tracker(ast_manager & m, bv_util & bvu, unsynch_mpz_manager & mm, powers & p) :
@ -109,59 +79,6 @@ public:
m_mpz_manager.del(m_two);
}
void updt_params(params_ref const & _p) {
sls_params p(_p);
m_walksat = p.walksat();
m_ucb = p.walksat_ucb();
m_ucb_constant = p.walksat_ucb_constant();
m_ucb_init = p.walksat_ucb_init();
m_ucb_forget = p.walksat_ucb_forget();
m_ucb_noise = p.walksat_ucb_noise();
m_scale_unsat = p.scale_unsat();
m_paws_init = p.paws_init();
// Andreas: track_unsat is currently disabled because I cannot guarantee that it is not buggy.
// If you want to use it, you will also need to change comments in the assertion selection.
m_track_unsat = 0;//p.track_unsat();
}
/* Andreas: Tried to give some measure for the formula size by the following two methods but both are not used currently.
unsigned get_formula_size() {
return m_scores.size();
}
double get_avg_bw(goal_ref const & g) {
double sum = 0.0;
unsigned count = 0;
for (unsigned i = 0; i < g->size(); i++)
{
m_temp_constants.reset();
ptr_vector<func_decl> const & this_decls = m_constants_occ.find(g->form(i));
unsigned sz = this_decls.size();
for (unsigned i = 0; i < sz; i++) {
func_decl * fd = this_decls[i];
m_temp_constants.push_back(fd);
sort * srt = fd->get_range();
sum += (m_manager.is_bool(srt)) ? 1 : m_bv_util.get_bv_size(srt);
count++;
}
}
return sum / count;
}*/
inline void adapt_top_sum(expr * e, double add, double sub) {
m_top_sum += m_weights.find(e) * (add - sub);
}
inline void set_top_sum(double new_score) {
m_top_sum = new_score;
}
inline double get_top_sum() {
return m_top_sum;
}
inline void set_value(expr * n, const mpz & r) {
SASSERT(m_scores.contains(n));
m_mpz_manager.set(m_scores.find(n).value, r);
@ -206,26 +123,6 @@ public:
return get_score(ep);
}
inline void set_score_prune(expr * n, double score) {
SASSERT(m_scores.contains(n));
m_scores.find(n).score_prune = score;
}
inline double & get_score_prune(expr * n) {
SASSERT(m_scores.contains(n));
return m_scores.find(n).score_prune;
}
inline unsigned has_pos_occ(expr * n) {
SASSERT(m_scores.contains(n));
return m_scores.find(n).has_pos_occ;
}
inline unsigned has_neg_occ(expr * n) {
SASSERT(m_scores.contains(n));
return m_scores.find(n).has_neg_occ;
}
inline unsigned get_distance(expr * n) {
SASSERT(m_scores.contains(n));
return m_scores.find(n).distance;
@ -249,32 +146,11 @@ public:
return m_uplinks.contains(n);
}
inline bool is_top_expr(expr * n) {
return m_top_expr.contains(n);
}
inline ptr_vector<expr> & get_uplinks(expr * n) {
SASSERT(m_uplinks.contains(n));
return m_uplinks.find(n);
}
inline void ucb_forget(ptr_vector<expr> & as) {
if (m_ucb_forget < 1.0)
{
expr * e;
unsigned touched_old, touched_new;
for (unsigned i = 0; i < as.size(); i++)
{
e = as[i];
touched_old = m_scores.find(e).touched;
touched_new = (unsigned)((touched_old - 1) * m_ucb_forget + 1);
m_scores.find(e).touched = touched_new;
m_touched += touched_new - touched_old;
}
}
}
void initialize(app * n) {
// Build score table
if (!m_scores.contains(n)) {
@ -350,12 +226,12 @@ public:
}
};
void calculate_expr_distances(ptr_vector<expr> const & as) {
void calculate_expr_distances(goal_ref const & g) {
// precondition: m_scores is set up.
unsigned sz = as.size();
unsigned sz = g->size();
ptr_vector<app> stack;
for (unsigned i = 0; i < sz; i++)
stack.push_back(to_app(as[i]));
stack.push_back(to_app(g->form(i)));
while (!stack.empty()) {
app * cur = stack.back();
stack.pop_back();
@ -373,53 +249,57 @@ public:
}
}
/* Andreas: Used this at some point to have values for the non-top-level expressions.
However, it did not give better performance but even cause some additional m/o - is not used currently.
void initialize_recursive(init_proc proc, expr_mark visited, expr * e) {
if (m_manager.is_and(e) || m_manager.is_or(e)) {
app * a = to_app(e);
expr * const * args = a->get_args();
unsigned int sz = a->get_num_args();
for (unsigned int i = 0; i < sz; i++) {
expr * q = args[i];
initialize_recursive(proc, visited, q);
}
}
for_each_expr(proc, visited, e);
}
void initialize_recursive(init_proc proc, expr_mark visited, expr * e) {
if (m_manager.is_and(e) || m_manager.is_or(e)) {
app * a = to_app(e);
expr * const * args = a->get_args();
unsigned int sz = a->get_num_args();
for (unsigned int i = 0; i < sz; i++) {
expr * q = args[i];
initialize_recursive(proc, visited, q);
}
}
for_each_expr(proc, visited, e);
}
void initialize_recursive(expr * e) {
if (m_manager.is_and(e) || m_manager.is_or(e)) {
app * a = to_app(e);
expr * const * args = a->get_args();
unsigned int sz = a->get_num_args();
for (unsigned int i = 0; i < sz; i++) {
expr * q = args[i];
initialize_recursive(q);
}
}
ptr_vector<func_decl> t;
void initialize_recursive(expr * e) {
if (m_manager.is_and(e) || m_manager.is_or(e)) {
app * a = to_app(e);
expr * const * args = a->get_args();
unsigned int sz = a->get_num_args();
for (unsigned int i = 0; i < sz; i++) {
expr * q = args[i];
initialize_recursive(q);
}
}
ptr_vector<func_decl> t;
m_constants_occ.insert_if_not_there(e, t);
find_func_decls_proc ffd_proc(m_manager, m_constants_occ.find(e));
expr_fast_mark1 visited;
quick_for_each_expr(ffd_proc, visited, e);
}*/
}
void initialize(ptr_vector<expr> const & as) {
void initialize(goal_ref const & g) {
init_proc proc(m_manager, *this);
expr_mark visited;
unsigned sz = as.size();
unsigned sz = g->size();
for (unsigned i = 0; i < sz; i++) {
expr * e = as[i];
if (!m_top_expr.contains(e))
m_top_expr.insert(e);
expr * e = g->form(i);
// Andreas: Maybe not fully correct.
#if _FOCUS_ == 2
initialize_recursive(proc, visited, e);
#endif
for_each_expr(proc, visited, e);
}
visited.reset();
for (unsigned i = 0; i < sz; i++) {
expr * e = as[i];
expr * e = g->form(i);
// Andreas: Maybe not fully correct.
#if _FOCUS_ == 2
initialize_recursive(e);
#endif
ptr_vector<func_decl> t;
m_constants_occ.insert_if_not_there(e, t);
find_func_decls_proc ffd_proc(m_manager, m_constants_occ.find(e));
@ -427,82 +307,9 @@ public:
quick_for_each_expr(ffd_proc, visited, e);
}
calculate_expr_distances(as);
calculate_expr_distances(g);
TRACE("sls", tout << "Initial model:" << std::endl; show_model(tout); );
if (m_track_unsat)
{
m_list_false = new expr*[sz];
for (unsigned i = 0; i < sz; i++)
{
if (m_mpz_manager.eq(get_value(as[i]), m_zero))
break_assertion(as[i]);
}
}
m_temp_seen.reset();
for (unsigned i = 0; i < sz; i++)
{
expr * e = as[i];
// initialize weights
if (!m_weights.contains(e))
m_weights.insert(e, m_paws_init);
// positive/negative occurences used for early pruning
setup_occs(as[i]);
}
// initialize ucb total touched value (individual ones are always initialized to 1)
m_touched = m_ucb_init ? as.size() : 1;
}
void increase_weight(expr * e)
{
m_weights.find(e)++;
}
void decrease_weight(expr * e)
{
unsigned old_weight = m_weights.find(e);
m_weights.find(e) = old_weight > m_paws_init ? old_weight - 1 : m_paws_init;
}
unsigned get_weight(expr * e)
{
return m_weights.find(e);
}
void make_assertion(expr * e)
{
if (m_track_unsat)
{
if (m_where_false.contains(e))
{
unsigned pos = m_where_false.find(e);
m_where_false.erase(e);
if (pos != m_where_false.size())
{
expr * q = m_list_false[m_where_false.size()];
m_list_false[pos] = q;
m_where_false.find(q) = pos;
}
}
}
}
void break_assertion(expr * e)
{
if (m_track_unsat)
{
if (!m_where_false.contains(e))
{
unsigned pos = m_where_false.size();
m_list_false[pos] = e;
m_where_false.insert(e, pos);
}
}
}
void show_model(std::ostream & out) {
@ -599,7 +406,7 @@ public:
NOT_IMPLEMENTED_YET(); // This only works for bit-vectors for now.
}
void randomize(ptr_vector<expr> const & as) {
void randomize() {
TRACE("sls", tout << "Abandoned model:" << std::endl; show_model(tout); );
for (entry_point_type::iterator it = m_entry_points.begin(); it != m_entry_points.end(); it++) {
@ -613,55 +420,6 @@ public:
TRACE("sls", tout << "Randomized model:" << std::endl; show_model(tout); );
}
void reset(ptr_vector<expr> const & as) {
TRACE("sls", tout << "Abandoned model:" << std::endl; show_model(tout); );
for (entry_point_type::iterator it = m_entry_points.begin(); it != m_entry_points.end(); it++) {
mpz temp = m_zero;
set_value(it->m_value, temp);
m_mpz_manager.del(temp);
}
}
void setup_occs(expr * n, bool negated = false) {
if (m_manager.is_bool(n))
{
if (m_manager.is_and(n) || m_manager.is_or(n))
{
SASSERT(!negated);
app * a = to_app(n);
expr * const * args = a->get_args();
for (unsigned i = 0; i < a->get_num_args(); i++)
{
expr * child = args[i];
if (!m_temp_seen.contains(child))
{
setup_occs(child, false);
m_temp_seen.insert(child);
}
}
}
else if (m_manager.is_not(n))
{
SASSERT(!negated);
app * a = to_app(n);
SASSERT(a->get_num_args() == 1);
expr * child = a->get_arg(0);
SASSERT(!m_manager.is_and(child) && !m_manager.is_or(child));
setup_occs(child, true);
}
else
{
if (negated)
m_scores.find(n).has_neg_occ = 1;
else
m_scores.find(n).has_pos_occ = 1;
}
}
else
NOT_IMPLEMENTED_YET();
}
double score_bool(expr * n, bool negated = false) {
TRACE("sls_score", tout << ((negated)?"NEG ":"") << "BOOL: " << mk_ismt2_pp(n, m_manager) << std::endl; );
@ -678,28 +436,41 @@ public:
SASSERT(!negated);
app * a = to_app(n);
expr * const * args = a->get_args();
/* Andreas: Seems to have no effect. But maybe you want to try it again at some point.
// Andreas: Seems to have no effect. Probably it does not even occur.
#if _SCORE_AND_AVG_
double sum = 0.0;
for (unsigned i = 0; i < a->get_num_args(); i++)
sum += get_score(args[i]);
res = sum / (double) a->get_num_args(); */
double min = 1.0;
res = sum / (double) a->get_num_args();
#else
double min = 1.0;
for (unsigned i = 0; i < a->get_num_args(); i++) {
double cur = get_score(args[i]);
if (cur < min) min = cur;
}
res = min;
#endif
}
else if (m_manager.is_or(n)) {
SASSERT(!negated);
app * a = to_app(n);
expr * const * args = a->get_args();
double max = 0.0;
// Andreas: Seems to have no effect. Probably it is still too similar to the original version.
#if _SCORE_OR_MUL_
double inv = 1.0;
for (unsigned i = 0; i < a->get_num_args(); i++) {
double cur = get_score(args[i]);
inv *= (1.0 - get_score(args[i]));
}
res = 1.0 - inv;
#else
double max = 0.0;
for (unsigned i = 0; i < a->get_num_args(); i++) {
double cur = get_score(args[i]);
if (cur > max) max = cur;
}
res = max;
#endif
}
else if (m_manager.is_ite(n)) {
SASSERT(!negated);
@ -717,7 +488,7 @@ public:
expr * arg1 = a->get_arg(1);
const mpz & v0 = get_value(arg0);
const mpz & v1 = get_value(arg1);
if (negated) {
res = (m_mpz_manager.eq(v0, v1)) ? 0.0 : 1.0;
TRACE("sls_score", tout << "V0 = " << m_mpz_manager.to_string(v0) << " ; V1 = " <<
@ -733,14 +504,24 @@ public:
m_mpz_manager.bitwise_xor(v0, v1, diff);
unsigned hamming_distance = 0;
unsigned bv_sz = m_bv_util.get_bv_size(arg0);
// unweighted hamming distance
#if 1 // unweighted hamming distance
while (!m_mpz_manager.is_zero(diff)) {
//m_mpz_manager.set(diff_m1, diff);
//m_mpz_manager.dec(diff_m1);
//m_mpz_manager.bitwise_and(diff, diff_m1, diff);
//hamming_distance++;
if (!m_mpz_manager.is_even(diff)) {
hamming_distance++;
}
m_mpz_manager.machine_div(diff, m_two, diff);
}
res = 1.0 - (hamming_distance / (double) bv_sz);
#else
rational r(diff);
r /= m_powers(bv_sz);
double dbl = r.get_double();
res = (dbl < 0.0) ? 1.0 : (dbl > 1.0) ? 0.0 : 1.0 - dbl;
#endif
TRACE("sls_score", tout << "V0 = " << m_mpz_manager.to_string(v0) << " ; V1 = " <<
m_mpz_manager.to_string(v1) << " ; HD = " << hamming_distance <<
" ; SZ = " << bv_sz << std::endl; );
@ -755,7 +536,7 @@ public:
SASSERT(a->get_num_args() == 2);
const mpz & x = get_value(a->get_arg(0));
const mpz & y = get_value(a->get_arg(1));
int bv_sz = m_bv_util.get_bv_size(a->get_decl()->get_domain()[0]);
unsigned bv_sz = m_bv_util.get_bv_size(a->get_decl()->get_domain()[0]);
if (negated) {
if (m_mpz_manager.gt(x, y))
@ -769,7 +550,7 @@ public:
double dbl = n.get_double();
// In extreme cases, n is 0.9999 but to_double returns something > 1.0
res = (dbl > 1.0) ? 0.0 : (dbl < 0.0) ? 1.0 : 1.0 - dbl;
m_mpz_manager.del(diff);
m_mpz_manager.del(diff);
}
}
else {
@ -781,7 +562,7 @@ public:
rational n(diff);
n /= rational(m_powers(bv_sz));
double dbl = n.get_double();
res = (dbl > 1.0) ? 0.0 : (dbl < 0.0) ? 1.0 : 1.0 - dbl;
res = (dbl > 1.0) ? 1.0 : (dbl < 0.0) ? 0.0 : dbl;
m_mpz_manager.del(diff);
}
}
@ -801,7 +582,7 @@ public:
if (negated) {
if (x > y)
res = 1.0;
res = 1.0;
else {
mpz diff;
m_mpz_manager.sub(y, x, diff);
@ -817,21 +598,20 @@ public:
}
else {
if (x <= y)
res = 1.0;
res = 1.0;
else {
mpz diff;
m_mpz_manager.sub(x, y, diff);
SASSERT(!m_mpz_manager.is_neg(diff));
rational n(diff);
n /= p;
double dbl = n.get_double();
res = (dbl > 1.0) ? 0.0 : (dbl < 0.0) ? 1.0 : 1.0 - dbl;
res = (dbl > 1.0) ? 1.0 : (dbl < 0.0) ? 0.0 : dbl;
m_mpz_manager.del(diff);
}
TRACE("sls_score", tout << "x = " << m_mpz_manager.to_string(x) << " ; y = " <<
m_mpz_manager.to_string(y) << " ; SZ = " << bv_sz << std::endl; );
}
m_mpz_manager.del(x);
m_mpz_manager.del(x);
m_mpz_manager.del(y);
}
else if (m_manager.is_not(n)) {
@ -839,9 +619,7 @@ public:
app * a = to_app(n);
SASSERT(a->get_num_args() == 1);
expr * child = a->get_arg(0);
// Precondition: Assertion set is in NNF.
// Also: careful about the unsat assertion scaling further down.
if (m_manager.is_and(child) || m_manager.is_or(child))
if (m_manager.is_and(child) || m_manager.is_or(child)) // Precondition: Assertion set is in NNF.
NOT_IMPLEMENTED_YET();
res = score_bool(child, true);
}
@ -867,16 +645,24 @@ public:
SASSERT(res >= 0.0 && res <= 1.0);
app * a = to_app(n);
family_id afid = a->get_family_id();
#if _WEIGHT_DIST_
app * a = to_app(n);
family_id afid = a->get_family_id();
if (afid == m_bv_util.get_family_id())
#endif
#if _WEIGHT_DIST_ == 1
if (res < 1.0) res *= _WEIGHT_DIST_FACTOR_;
#elif _WEIGHT_DIST_ == 2
res *= res;
#elif _WEIGHT_DIST_ == 3
if (res < 1.0) res = 0.0;
#endif
if (afid == m_bv_util.get_family_id())
if (res < 1.0) res *= m_scale_unsat;
TRACE("sls_score", tout << "SCORE = " << res << std::endl; );
return res;
}
double score_bv(expr * n) {
return 0.0; // a bv-expr is always scored as 0.0; we won't use those scores.
}
@ -922,28 +708,9 @@ public:
NOT_IMPLEMENTED_YET();
}
ptr_vector<func_decl> & get_constants(expr * e) {
ptr_vector<func_decl> const & this_decls = m_constants_occ.find(e);
unsigned sz = this_decls.size();
ptr_vector<func_decl> & get_unsat_constants_gsat(goal_ref const & g, unsigned sz) {
for (unsigned i = 0; i < sz; i++) {
func_decl * fd = this_decls[i];
if (!m_temp_constants.contains(fd))
m_temp_constants.push_back(fd);
}
return m_temp_constants;
}
ptr_vector<func_decl> & get_unsat_constants_gsat(ptr_vector<expr> const & as) {
unsigned sz = as.size();
if (sz == 1) {
if (m_mpz_manager.neq(get_value(as[0]), m_one))
return get_constants();
}
m_temp_constants.reset();
for (unsigned i = 0; i < sz; i++) {
expr * q = as[i];
expr * q = g->form(i);
if (m_mpz_manager.eq(get_value(q), m_one))
continue;
ptr_vector<func_decl> const & this_decls = m_constants_occ.find(q);
@ -955,110 +722,141 @@ public:
}
}
return m_temp_constants;
}
}
ptr_vector<func_decl> & get_unsat_constants_walksat(expr * e) {
if (!e || m_temp_constants.size())
return m_temp_constants;
ptr_vector<func_decl> const & this_decls = m_constants_occ.find(e);
unsigned sz = this_decls.size();
for (unsigned j = 0; j < sz; j++) {
expr * get_unsat_assertion(goal_ref const & g, unsigned sz, unsigned int pos) {
for (unsigned i = pos; i < sz; i++) {
expr * q = g->form(i);
if (m_mpz_manager.neq(get_value(q), m_one))
return q;
}
for (unsigned i = 0; i < pos; i++) {
expr * q = g->form(i);
if (m_mpz_manager.neq(get_value(q), m_one))
return q;
}
return 0;
}
ptr_vector<func_decl> & get_unsat_constants_walksat(goal_ref const & g, unsigned sz, unsigned int pos) {
expr * q = get_unsat_assertion(g, sz, pos);
// Andreas: I should probably fix this. If this is the case then the formula is SAT anyway but this is not checked in the first iteration.
if (!q)
return m_temp_constants;
ptr_vector<func_decl> const & this_decls = m_constants_occ.find(q);
unsigned sz2 = this_decls.size();
for (unsigned j = 0; j < sz2; j++) {
func_decl * fd = this_decls[j];
if (!m_temp_constants.contains(fd))
m_temp_constants.push_back(fd);
}
return m_temp_constants;
}
return m_temp_constants;
}
ptr_vector<func_decl> & get_unsat_constants(ptr_vector<expr> const & as) {
if (m_walksat)
{
expr * e = get_unsat_assertion(as);
if (!e)
{
m_temp_constants.reset();
return m_temp_constants;
ptr_vector<func_decl> & go_deeper(expr * e) {
if (m_manager.is_bool(e)) {
if (m_manager.is_and(e)) {
app * a = to_app(e);
expr * const * args = a->get_args();
// Andreas: might be used for guided branching
//for (unsigned i = 0; i < a->get_num_args(); i++) {
//double cur = get_score(args[i]);
//}
// Andreas: A random number is better here since reusing flip will cause patterns.
unsigned int sz = a->get_num_args();
unsigned int pos = get_random_uint(16) % sz;
for (unsigned int i = pos; i < sz; i++) {
expr * q = args[i];
if (m_mpz_manager.neq(get_value(q), m_one))
return go_deeper(q);
}
for (unsigned int i = 0; i < pos; i++) {
expr * q = args[i];
if (m_mpz_manager.neq(get_value(q), m_one))
return go_deeper(q);
}
}
else if (m_manager.is_or(e)) {
app * a = to_app(e);
expr * const * args = a->get_args();
unsigned int sz = a->get_num_args();
unsigned int pos = get_random_uint(16) % sz;
for (unsigned int i = pos; i < sz; i++) {
expr * q = args[i];
if (m_mpz_manager.neq(get_value(q), m_one))
return go_deeper(q);
}
for (unsigned int i = 0; i < pos; i++) {
expr * q = args[i];
if (m_mpz_manager.neq(get_value(q), m_one))
return go_deeper(q);
}
}
}
ptr_vector<func_decl> const & this_decls = m_constants_occ.find(e);
unsigned sz2 = this_decls.size();
for (unsigned j = 0; j < sz2; j++) {
func_decl * fd = this_decls[j];
if (!m_temp_constants.contains(fd))
m_temp_constants.push_back(fd);
}
return m_temp_constants;
}
ptr_vector<func_decl> & get_unsat_constants_crsat(goal_ref const & g, unsigned sz, unsigned int pos) {
expr * q = get_unsat_assertion(g, sz, pos);
if (!q)
return m_temp_constants;
return go_deeper(q);
}
ptr_vector<func_decl> & get_unsat_constants(goal_ref const & g, unsigned int flip) {
unsigned sz = g->size();
return get_unsat_constants_walksat(e);
}
else
return get_unsat_constants_gsat(as);
}
expr * get_unsat_assertion(ptr_vector<expr> const & as) {
unsigned sz = as.size();
if (sz == 1) {
if (m_mpz_manager.neq(get_value(as[0]), m_one))
return as[0];
else
return 0;
return get_constants();
}
m_temp_constants.reset();
unsigned pos = -1;
if (m_ucb)
{
value_score vscore;
double max = -1.0;
// Andreas: Commented things here might be used for track_unsat data structures as done in SLS for SAT. But seems to have no benefit.
/* for (unsigned i = 0; i < m_where_false.size(); i++) {
expr * e = m_list_false[i]; */
for (unsigned i = 0; i < sz; i++) {
expr * e = as[i];
if (m_mpz_manager.neq(get_value(e), m_one))
{
vscore = m_scores.find(e);
// Andreas: Select the assertion with the greatest ucb score. Potentially add some noise.
// double q = vscore.score + m_ucb_constant * sqrt(log((double)m_touched) / vscore.touched);
double q = vscore.score + m_ucb_constant * sqrt(log((double)m_touched) / vscore.touched) + m_ucb_noise * get_random_uint(8);
if (q > max) { max = q; pos = i; }
}
else {
m_temp_constants.reset();
#if _FOCUS_ == 1
#if _BFS_ == 3
unsigned int pos = 0;
double max = get_score(g->form(0));
unsigned sz = g->size();
for (unsigned i = 1; i < sz; i++) {
expr * e = g->form(i);
double q = get_score(e);
if (q > max && m_mpz_manager.neq(get_value(e), m_one) ) { max = q; pos = i; }
}
if (pos == static_cast<unsigned>(-1))
return 0;
m_touched++;
m_scores.find(as[pos]).touched++;
// Andreas: Also part of track_unsat data structures. Additionally disable the previous line!
/* m_last_pos = pos;
m_scores.find(m_list_false[pos]).touched++;
return m_list_false[pos]; */
#elif _BFS_ == 2
unsigned int pos = 0;
double min = get_score(g->form(0));
unsigned sz = g->size();
for (unsigned i = 1; i < sz; i++) {
expr * e = g->form(i);
double q = get_score(e);
if (q < min && m_mpz_manager.neq(get_value(e), m_one) ) { min = q; pos = i; }
}
#elif _BFS_ == 1
unsigned int pos = flip % m_constants.size();
#else
unsigned int pos = get_random_uint(16) % m_constants.size();
#endif
return get_unsat_constants_walksat(g, sz, pos);
#elif _FOCUS_ == 2
#if _BFS_
unsigned int pos = flip % m_constants.size();
#else
unsigned int pos = get_random_uint(16) % m_constants.size();
#endif
return get_unsat_constants_crsat(g, sz, pos);
#else
return get_unsat_constants_gsat(g, sz);
#endif
}
else
{
// Andreas: The track_unsat data structures for random assertion selection.
/* sz = m_where_false.size();
if (sz == 0)
return 0;
return m_list_false[get_random_uint(16) % sz]; */
unsigned cnt_unsat = 0;
for (unsigned i = 0; i < sz; i++)
if (m_mpz_manager.neq(get_value(as[i]), m_one) && (get_random_uint(16) % ++cnt_unsat == 0)) pos = i;
if (pos == static_cast<unsigned>(-1))
return 0;
}
m_last_pos = pos;
return as[pos];
}
expr * get_new_unsat_assertion(ptr_vector<expr> const & as) {
unsigned sz = as.size();
if (sz == 1)
return 0;
m_temp_constants.reset();
unsigned cnt_unsat = 0, pos = -1;
for (unsigned i = 0; i < sz; i++)
if ((i != m_last_pos) && m_mpz_manager.neq(get_value(as[i]), m_one) && (get_random_uint(16) % ++cnt_unsat == 0)) pos = i;
if (pos == static_cast<unsigned>(-1))
return 0;
return as[pos];
}
};
#endif
#endif

4
versions/z3-wsat-0.01.txt
View file

@ -9,6 +9,4 @@ No restarts.
#define _RESTARTS_ 0
#define _TIMELIMIT_ 300
#define _SCORE_AND_AVG_ 0
#define _SCORE_OR_MUL_ 0
BUGGY VERSION! Uses wrong value for modulo operation in assertion selection.
#define _SCORE_OR_MUL_ 0

4
versions/z3-wsat-0.01b.txt
View file

@ -9,6 +9,4 @@ No restarts.
#define _RESTARTS_ 0
#define _TIMELIMIT_ 300
#define _SCORE_AND_AVG_ 0
#define _SCORE_OR_MUL_ 0
BUGGY VERSION! Uses wrong value for modulo operation in assertion selection.
#define _SCORE_OR_MUL_ 0