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update model-guide heuristic

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2025-11-21 15:52:37 -08:00
parent ed84b14e6c
commit ee63585581
1 changed files with 15 additions and 2 deletions
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17
src/nlsat/nlsat_solver.cpp
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@ -1875,6 +1875,7 @@ namespace nlsat {
m_stats.m_conflicts = 0;
m_stats.m_restarts = 0;
m_next_conflict = 0;
unsigned_vector frequency;
random_gen rand(++m_random_seed);
while (true) {
r = search();
@ -1908,6 +1909,8 @@ namespace nlsat {
}
}
bounds.push_back(std::make_pair(x, lo));
frequency.reserve(x+1);
++frequency[x];
}
}
if (bounds.empty())
@ -1923,10 +1926,20 @@ namespace nlsat {
// todo, review, test
// cut on the first model value
if (!m_model_values.empty()) {
if (!m_model_values.empty() && m_stats.m_restarts % 10 == 0) {
bool found = false;
auto const &[x, value] = bounds[rand(bounds.size())];
unsigned i = 1, choice = 0;
unsigned f = frequency[bounds[0].first];
for (; i < bounds.size(); ++i) {
auto const &[x, value] = bounds[i];
frequency.reserve(x + 1);
if (frequency[x] > f) {
f = frequency[x];
choice = i;
}
}
auto const &[x, value] = bounds[choice];
for (auto const &[ext_x, mvalue, lo, hi] : m_model_values) {
if (ext_x == m_perm[x]) {
TRACE(nla_solver, tout << "x" << ext_x << " bound " << mvalue << "\n");