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modify backoff mechanisms and theory exchange

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This commit is contained in:
Nikolaj Bjorner 2025-01-22 20:32:30 -08:00
parent 3a3e176dce
commit ec3915218d
8 changed files with 60 additions and 12 deletions
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14
src/ast/sls/sat_ddfw.cpp
View file

@ -81,14 +81,14 @@ namespace sat {
void ddfw::log() {
double sec = m_stopwatch.get_current_seconds();
double kflips_per_sec = sec > 0 ? (m_flips - m_last_flips) / (1000.0 * sec) : 0.0;
if (m_last_flips == 0) {
IF_VERBOSE(1, verbose_stream() << "(sat.ddfw :unsat :models :kflips/sec :flips :restarts :reinits :unsat_vars :shifts";
if (m_logs++ % 30 == 0) {
IF_VERBOSE(2, verbose_stream() << "(sat.ddfw :unsat :models :kflips/sec :flips :restarts :reinits :unsat_vars :shifts";
verbose_stream() << ")\n");
}
IF_VERBOSE(1, verbose_stream() << "(sat.ddfw "
IF_VERBOSE(2, verbose_stream() << "(sat.ddfw "
<< std::setw(07) << m_min_sz
<< std::setw(07) << m_models.size()
<< std::setw(10) << kflips_per_sec
<< std::setw(11) << std::fixed << std::setprecision(4) << kflips_per_sec
<< std::setw(10) << m_flips
<< std::setw(10) << m_restart_count
<< std::setw(11) << m_reinit_count
@ -214,6 +214,10 @@ namespace sat {
}
void ddfw::init(unsigned sz, literal const* assumptions) {
if (sz == 0 && m_initialized) {
m_stopwatch.start();
return;
}
m_assumptions.reset();
m_assumptions.append(sz, assumptions);
add_assumptions();
@ -235,6 +239,8 @@ namespace sat {
m_last_flips = 0;
m_shifts = 0;
m_stopwatch.start();
if (sz == 0)
m_initialized = true;
}
void ddfw::reinit() {

4
src/ast/sls/sat_ddfw.h
View file

@ -99,6 +99,7 @@ namespace sat {
unsigned m_restart_count = 0, m_reinit_count = 0;
uint64_t m_restart_next = 0, m_reinit_next = 0;
uint64_t m_flips = 0, m_last_flips = 0, m_shifts = 0;
unsigned m_logs = 0;
unsigned m_min_sz = UINT_MAX;
u_map<unsigned> m_models;
stopwatch m_stopwatch;
@ -168,7 +169,7 @@ namespace sat {
void check_with_plugin();
void check_without_plugin();
// flip activity
// flip
bool do_flip();
bool_var pick_var(double& reward);
@ -216,6 +217,7 @@ namespace sat {
void flip(bool_var v);
bool m_in_external_flip = false;
bool m_initialized = false;
public:

19
src/ast/sls/sls_arith_clausal.cpp
View file

@ -218,8 +218,12 @@ namespace sls {
m_best_delta = 0;
m_best_abs_value = num_t(-1);
m_best_last_step = UINT_MAX;
m_num_lookaheads = 0;
for (auto const& u : a.m_updates)
lookahead(u.m_var, u.m_delta);
// verbose_stream() << a.m_updates.size() << " " << m_num_lookaheads << " lookaheads\n";
ctx.rlimit().inc(1 + m_num_lookaheads/10);
critical_move(m_best_var, m_best_delta, mt);
return m_best_var;
}
@ -247,11 +251,11 @@ namespace sls {
m_last_delta = delta;
if (!a.can_update_num(v, delta))
return;
ctx.rlimit().inc();
auto score = get_score(v, delta);
auto& vi = a.m_vars[v];
num_t abs_value = abs(vi.value() + delta);
unsigned last_step = vi.last_step(delta);
++m_num_lookaheads;
if (score < a.m_best_score)
return;
if (score > a.m_best_score ||
@ -338,10 +342,21 @@ namespace sls {
template<typename num_t>
void arith_clausal<num_t>::check_restart() {
if (m_no_improve <= 500000)
return;
#if 0
if (a.m_stats.m_steps < a.m_config.restart_next)
return;
IF_VERBOSE(2, verbose_stream() << "restart sls-arith\n");
++a.m_stats.m_restarts;
a.m_config.restart_next = std::max(a.m_config.restart_next, a.m_stats.m_steps);
a.m_config.restart_next += (2 * a.m_stats.m_restarts * a.m_config.restart_base)/3;
#endif
IF_VERBOSE(2, verbose_stream() << "restart sls-arith " << a.m_config.restart_next << "\n");
TRACE("arith", tout << "restart\n";);
// reset values of (arithmetical) variables at bounds.
for (auto& vi : a.m_vars) {

1
src/ast/sls/sls_arith_clausal.h
View file

@ -76,6 +76,7 @@ namespace sls {
num_t m_best_delta;
var_t m_best_var = UINT_MAX;
unsigned m_best_last_step = 0;
unsigned m_num_lookaheads = 0;
// avoid checking the same updates twice
var_t m_last_var = UINT_MAX;

15
src/ast/sls/sls_smt_plugin.cpp
View file

@ -101,7 +101,7 @@ namespace sls {
if (!m_ddfw)
return;
m_result = m_ddfw->check(0, nullptr);
IF_VERBOSE(2, verbose_stream() << "sls-result " << m_result << "\n");
IF_VERBOSE(3, verbose_stream() << "sls-result " << m_result << "\n");
for (auto v : m_shared_bool_vars) {
auto w = m_smt_bool_var2sls_bool_var[v];
m_rewards[v] = m_ddfw->get_reward_avg(w);
@ -110,7 +110,7 @@ namespace sls {
}
void smt_plugin::bounded_run(unsigned max_iterations) {
verbose_stream() << "bounded run " << max_iterations << "\n";
IF_VERBOSE(3, verbose_stream() << "(sls-bounded :" << max_iterations << ")\n");
m_ddfw->rlimit().reset_count();
m_ddfw->rlimit().push(max_iterations);
{
@ -229,6 +229,7 @@ namespace sls {
}
void smt_plugin::export_phase_to_sls() {
#if 0
IF_VERBOSE(2, verbose_stream() << "SMT -> SLS phase\n");
for (auto v : m_shared_bool_vars) {
auto w = m_smt_bool_var2sls_bool_var[v];
@ -236,9 +237,11 @@ namespace sls {
flip(w);
m_ddfw->bias(w) = m_sat_phase[v] ? 1 : -1;
}
#endif
}
void smt_plugin::smt_phase_to_sls() {
#if 0
IF_VERBOSE(2, verbose_stream() << "SMT -> SLS phase\n");
for (auto v : m_shared_bool_vars) {
auto w = m_smt_bool_var2sls_bool_var[v];
@ -247,9 +250,17 @@ namespace sls {
flip(w);
m_ddfw->bias(w) = phase ? 1 : -1;
}
#endif
}
void smt_plugin::smt_values_to_sls() {
if (m_value_smt2sls_delay < m_value_smt2sls_delay_threshold) {
m_value_smt2sls_delay++;
return;
}
verbose_stream() << m_value_smt2sls_delay << " " << m_value_smt2sls_delay_threshold << "\n";
m_value_smt2sls_delay_threshold += m_value_smt2sls_delay_threshold/3;
m_value_smt2sls_delay = 0;
IF_VERBOSE(2, verbose_stream() << "SMT -> SLS values\n");
for (auto const& [t, t_sync] : m_smt2sync_uninterp) {
expr_ref val_t(m);

3
src/ast/sls/sls_smt_plugin.h
View file

@ -63,6 +63,9 @@ namespace sls {
std::thread m_thread;
std::mutex m_mutex;
unsigned m_value_smt2sls_delay = 0;
unsigned m_value_smt2sls_delay_threshold = 50;
sat::literal_vector m_units;
model_ref m_sls_model;

9
src/smt/theory_sls.cpp
View file

@ -209,6 +209,7 @@ namespace smt {
m_smt_plugin->smt_units_to_sls();
++m_stats.m_num_restart_sls;
bounded_run(m_restart_ls_steps);
inc_restart_ls_steps();
if (m_smt_plugin)
m_smt_plugin->sls_activity_to_smt();
}
@ -235,6 +236,14 @@ namespace smt {
}
bool theory_sls::shared_clauses_are_true() const {
#if 0
for (auto const& cl : m_shared_clauses) {
for (auto lit : cl)
verbose_stream() << lit << " : " << ctx.get_assignment(lit);
verbose_stream() << "\n";
}
#endif
for (auto const& cl : m_shared_clauses)
if (all_of(cl, [this](sat::literal lit) { return ctx.get_assignment(lit) != l_true; }))
return false;

5
src/smt/theory_sls.h
View file

@ -65,8 +65,9 @@ namespace smt {
unsigned m_restart_ls_steps_inc = 10000;
unsigned m_restart_ls_steps_max = 300000;
unsigned m_final_check_ls_steps = 30000;
unsigned m_final_check_ls_steps_dec = 10000;
unsigned m_final_check_ls_steps_delta = 10000;
unsigned m_final_check_ls_steps_min = 10000;
unsigned m_final_check_ls_steps_max = 30000;
bool m_has_unassigned_clause_after_resolve = false;
unsigned m_after_resolve_decide_gap = 4;
unsigned m_after_resolve_decide_count = 0;
@ -84,7 +85,7 @@ namespace smt {
}
void dec_final_check_ls_steps() {
if (m_final_check_ls_steps > m_final_check_ls_steps_min)
m_final_check_ls_steps -= m_final_check_ls_steps_dec;
m_final_check_ls_steps -= m_final_check_ls_steps_delta;
}
bool shared_clauses_are_true() const;