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add equivalence explanations

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Signed-off-by: Lev <levnach@hotmail.com>
This commit is contained in:
Lev 2018-12-10 20:13:12 -10:00 • committed by Lev Nachmanson
parent 7c05d5e5d3
commit 0ff07aed3f
3 changed files with 41 additions and 38 deletions
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19
src/util/lp/vars_equivalence.h
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@ -17,10 +17,11 @@
--*/
namespace nla {
typedef lp::constraint_index lpci;
typedef std::unordered_set<lpci> expl_set;
typedef lp::explanation expl_set;
typedef lp::var_index lpvar;
struct hash_svector {
size_t operator()(const unsigned_vector & v) const {
@ -197,7 +198,13 @@ struct vars_equivalence {
}
}
void add_equiv_exp(unsigned j, expl_set& exp) const {
template <typename T>
void explain(const T& collection, expl_set & exp) const {
for (lpvar j : collection) {
explain(j, exp);
}
}
void explain(lpvar j, expl_set& exp) const {
while (true) {
auto it = m_tree.find(j);
if (it == m_tree.end())
@ -205,16 +212,16 @@ struct vars_equivalence {
if (it->second == static_cast<unsigned>(-1))
return;
const equiv & e = m_equivs[it->second];
exp.insert(e.m_c0);
exp.insert(e.m_c1);
exp.add(e.m_c0);
exp.add(e.m_c1);
j = get_parent_node(j, e);
}
}
template <typename T>
void add_explanation_of_reducing_to_rooted_monomial(const T & m, expl_set & exp) const {
for (auto j : m)
add_equiv_exp(j, exp);
for (lpvar j : m)
explain(j, exp);
}
void register_var(unsigned j, const rational& val) {