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debugging cuts

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-09-21 20:02:06 -07:00
parent b7ec4489a6
commit 1e6d2fbbdc
2 changed files with 17 additions and 27 deletions
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29
src/math/lp/gomory.cpp
View file

@ -388,16 +388,12 @@ int gomory::find_basic_var() {
int result = -1;
unsigned n = 0;
unsigned min_row_size = UINT_MAX;
#if 0
bool boxed = false;
mpq min_range;
#endif
// Prefer smaller row size
// Prefer boxed to non-boxed
// Prefer smaller ranges
for (unsigned j : lra.r_basis()) {
if (!lia.column_is_int_inf(j))
continue;
@ -405,28 +401,7 @@ int gomory::find_basic_var() {
if (!is_gomory_cut_target(row))
continue;
#if 0
if (is_boxed(j) && (min_row_size == UINT_MAX || 4*row.size() < 5*min_row_size)) {
lar_core_solver & lcs = lra.m_mpq_lar_core_solver;
auto new_range = lclia.m_r_upper_bounds()[j].x - lclia.m_r_lower_bounds()[j].x;
if (!boxed) {
result = j;
n = 1;
min_row_size = row.size();
boxed = true;
min_range = new_range;
continue;
}
if (min_range > 2*new_range || ((5*min_range > 4*new_range && (random() % (++n)) == 0))) {
result = j;
n = 1;
min_row_size = row.size();
min_range = std::min(min_range, new_range);
continue;
}
}
#endif
IF_VERBOSE(20, lia.display_row_info(verbose_stream(), lia.row_of_basic_column(j)));
if (min_row_size == UINT_MAX ||
2*row.size() < min_row_size ||
(4*row.size() < 5*min_row_size && lia.random() % (++n) == 0)) {

15
src/math/lp/int_solver.cpp
View file

@ -486,6 +486,19 @@ std::ostream& int_solver::display_row_info(std::ostream & out, unsigned row_inde
auto & rslv = lrac.m_r_solver;
bool first = true;
for (const auto &c: rslv.m_A.m_rows[row_index]) {
if (is_fixed(c.var())) {
if (!get_value(c.var()).is_zero()) {
impq val = get_value(c.var())*c.coeff();
if (!first && val.is_pos())
out << "+";
if (val.y.is_zero())
out << val.x << " ";
else
out << val << " ";
}
first = false;
continue;
}
if (c.coeff().is_one()) {
if (!first)
out << "+";
@ -508,6 +521,8 @@ std::ostream& int_solver::display_row_info(std::ostream & out, unsigned row_inde
}
out << "\n";
for (const auto& c: rslv.m_A.m_rows[row_index]) {
if (is_fixed(c.var()))
continue;
rslv.print_column_info(c.var(), out);
if (is_base(c.var())) out << "j" << c.var() << " base\n";
}