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delta faction to control double lookahead eagerness

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2018-12-04 23:41:03 -08:00
parent 44b2c3ce6b
commit dc77579707
6 changed files with 26 additions and 16 deletions
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11
src/sat/sat_lookahead.cpp
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@ -997,6 +997,7 @@ namespace sat {
void lookahead::init(bool learned) {
m_delta_trigger = 0.0;
m_delta_decrease = 0.0;
m_delta_fraction = m_s.m_config.m_lookahead_delta_fraction;
m_config.m_dl_success = 0.8;
m_inconsistent = false;
m_qhead = 0;
@ -1814,7 +1815,7 @@ namespace sat {
++m_stats.m_double_lookahead_rounds;
num_units = double_look(l, base);
if (!inconsistent()) {
m_delta_trigger = get_lookahead_reward(l);
m_delta_trigger = m_delta_fraction*get_lookahead_reward(l);
dl_disable(l);
}
}
@ -2098,7 +2099,9 @@ namespace sat {
m_cube_state.m_freevars_threshold = m_freevars.size();
m_cube_state.m_psat_threshold = m_config.m_cube_cutoff == adaptive_psat_cutoff ? psat_heur() : dbl_max; // MN. only compute PSAT if enabled
m_cube_state.inc_conflict();
if (!backtrack(m_cube_state.m_cube, m_cube_state.m_is_decision)) return l_false;
if (!backtrack(m_cube_state.m_cube, m_cube_state.m_is_decision)) {
return l_false;
}
continue;
}
pick_up_work:
@ -2131,7 +2134,9 @@ namespace sat {
m_cube_state.m_freevars_threshold = prev_nfreevars;
m_cube_state.m_psat_threshold = prev_psat;
m_cube_state.inc_conflict();
if (!backtrack(m_cube_state.m_cube, m_cube_state.m_is_decision)) return l_false;
if (!backtrack(m_cube_state.m_cube, m_cube_state.m_is_decision)) {
return l_false;
}
continue;
}
if (lit == null_literal) {