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avoid usisg indexed_vector for term operations

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Lev Nachmanson 2025-02-05 17:54:58 -10:00 • committed by Lev Nachmanson
parent 440d78f237
commit cf4e402a0f
1 changed files with 64 additions and 48 deletions
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112
src/math/lp/dioph_eq.cpp
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@ -323,7 +323,6 @@ namespace lp {
int_solver& lia;
lar_solver& lra;
explanation m_infeas_explanation;
indexed_vector<mpq> m_indexed_work_vector;
bool m_report_branch = false;
// set F
@ -345,6 +344,32 @@ namespace lp {
}
return r;
}
bool has(unsigned k) const {
return k < m_index.size() && m_index[k] >= 0;
}
const mpq& operator[](unsigned j) const {
SASSERT(j >= 0 && j < m_index.size());
SASSERT(m_index[j] >= 0 && m_index[j] < m_data.size());
return m_data[m_index[j]].coeff();
}
void erase(unsigned k) {
if (k >= m_index.size() || m_index[k] == -1)
return;
unsigned idx = m_index[k];
// If not last element, move last element to idx position
if (idx != m_data.size() - 1) {
m_data[idx] = m_data.back();
m_index[m_data[idx].var()] = idx;
}
m_data.pop_back();
m_index[k] = -1;
SASSERT(invariant());
}
void add(const mpq& a, unsigned j) {
SASSERT(!a.is_zero());
// Expand m_index if needed
@ -426,7 +451,8 @@ namespace lp {
};
term_with_index m_term_with_index;
term_with_index m_l_terms_workspace;
term_with_index m_substitution_workspace;
bijection m_k2s;
bij_map<lar_term> m_fresh_k2xt_terms;
@ -881,7 +907,7 @@ namespace lp {
open_l_term_to_work_vector(ei, c);
clear_e_row(ei);
mpq denom(1);
for (const auto & p: m_indexed_work_vector) {
for (const auto & p: m_substitution_workspace.m_data) {
unsigned lj = add_var(p.var());
m_e_matrix.add_columns_up_to(lj);
m_e_matrix.add_new_element(ei, lj, p.coeff());
@ -1189,8 +1215,8 @@ namespace lp {
print_term_o(create_term_from_ind_c(), tout) << std::endl;
tout << "subs with e:";
print_lar_term_L(e, tout) << std::endl;);
mpq coeff = - m_indexed_work_vector[k]; // need to copy since it will be zeroed
m_indexed_work_vector.erase(k); // m_indexed_work_vector[k] = 0;
mpq coeff = - m_substitution_workspace[k]; // need to copy since it will be zeroed
m_substitution_workspace.erase(k); // m_work_vector_1[k] = 0;
SASSERT(e.get_coeff(k).is_one());
@ -1198,22 +1224,21 @@ namespace lp {
unsigned j = p.var();
if (j == k)
continue;
m_indexed_work_vector.add_value_at_index(j, p.coeff()*coeff);
m_substitution_workspace.add(p.coeff()*coeff, j);
// do we need to add j to the queue?
if (!var_is_fresh(j) && !m_indexed_work_vector[j].is_zero() &&
can_substitute(j))
if (!var_is_fresh(j) && m_substitution_workspace.has(j) && can_substitute(j))
q.push(j);
}
// there is no change in m_l_matrix
TRACE("dioph_eq", tout << "after subs k:" << k << "\n";
print_term_o(create_term_from_ind_c(), tout) << std::endl;
tout << "m_term_with_index:{"; print_lar_term_L(m_term_with_index.m_data, tout);
tout << "}, opened:"; print_ml(m_term_with_index.to_term(), tout) << std::endl;);
tout << "m_term_with_index:{"; print_lar_term_L(m_l_terms_workspace.m_data, tout);
tout << "}, opened:"; print_ml(m_l_terms_workspace.to_term(), tout) << std::endl;);
}
void add_l_row_to_term_with_index(const mpq& coeff, unsigned ei) {
for (const auto & p: m_l_matrix.m_rows[ei]) {
m_term_with_index.add(coeff * p.coeff(), p.var());
m_l_terms_workspace.add(coeff * p.coeff(), p.var());
}
}
@ -1223,8 +1248,8 @@ namespace lp {
print_term_o(create_term_from_ind_c(), tout) << std::endl;
tout << "subs with e:";
print_entry(m_k2s[k], tout) << std::endl;);
mpq coeff = m_indexed_work_vector[k]; // need to copy since it will be zeroed
m_indexed_work_vector.erase(k); // m_indexed_work_vector[k] = 0;
mpq coeff = m_substitution_workspace[k]; // need to copy since it will be zeroed
m_substitution_workspace.erase(k); // m_work_vector_1[k] = 0;
const auto& e_row = m_e_matrix.m_rows[m_k2s[k]];
auto it = std::find_if(e_row.begin(), e_row.end(),
@ -1241,9 +1266,9 @@ namespace lp {
unsigned j = p.var();
if (j == k)
continue;
m_indexed_work_vector.add_value_at_index(j, p.coeff() * coeff);
m_substitution_workspace.add(p.coeff() * coeff, j);
// do we need to add j to the queue?
if (!var_is_fresh(j) && !m_indexed_work_vector[j].is_zero() &&
if (!var_is_fresh(j) && m_substitution_workspace.has(j) &&
can_substitute(j))
q.push(j);
}
@ -1251,8 +1276,8 @@ namespace lp {
add_l_row_to_term_with_index(coeff, sub_index(k));
TRACE("dioph_eq", tout << "after subs k:" << k << "\n";
print_term_o(create_term_from_ind_c(), tout) << std::endl;
tout << "m_term_with_index:{"; print_lar_term_L(m_term_with_index.to_term(), tout);
tout << "}, opened:"; print_ml(m_term_with_index.to_term(), tout) << std::endl;);
tout << "m_term_with_index:{"; print_lar_term_L(m_l_terms_workspace.to_term(), tout);
tout << "}, opened:"; print_ml(m_l_terms_workspace.to_term(), tout) << std::endl;);
}
bool is_substituted_by_fresh(unsigned k) const {
@ -1263,7 +1288,7 @@ namespace lp {
// the coefficient of x_k in t.
void subs_front_in_indexed_vector(protected_queue& q) {
unsigned k = q.pop_front();
if (m_indexed_work_vector[k].is_zero())
if (!m_substitution_workspace.has(k))
return;
// we might substitute with a term from S or a fresh term
@ -1362,25 +1387,23 @@ namespace lp {
term_o create_term_from_ind_c() {
term_o t;
for (const auto& p : m_indexed_work_vector) {
for (const auto& p : m_substitution_workspace.m_data) {
t.add_monomial(p.coeff(), p.var());
}
t.c() = m_c;
return t;
}
void fill_indexed_work_vector_from_term(const lar_term& lar_t) {
m_indexed_work_vector.clear();
m_indexed_work_vector.resize(m_e_matrix.column_count());
void init_substitutions(const lar_term& lar_t) {
m_substitution_workspace.clear();
m_c = 0;
m_term_with_index.clear();
m_l_terms_workspace.clear();
for (const auto& p : lar_t) {
SASSERT(p.coeff().is_int());
if (is_fixed(p.j()))
m_c += p.coeff() * lia.lower_bound(p.j()).x;
else
m_indexed_work_vector.set_value(p.coeff(),
lar_solver_to_local(p.j()));
m_substitution_workspace.add(p.coeff(), lar_solver_to_local(p.j()));
}
}
unsigned lar_solver_to_local(unsigned j) const {
@ -1404,13 +1427,13 @@ namespace lp {
}
TRACE("dioph_eq", tout << "j:" << j << ", t: ";
print_lar_term_L(term_to_tighten, tout) << std::endl;);
fill_indexed_work_vector_from_term(term_to_tighten);
init_substitutions(term_to_tighten);
TRACE("dioph_eq", tout << "t orig:";
print_lar_term_L(term_to_tighten, tout) << std::endl;
tout << "from ind:";
print_term_o(create_term_from_ind_c(), tout) << std::endl;
tout << "m_tmp_l:";
print_lar_term_L(m_term_with_index.to_term(), tout) << std::endl;);
print_lar_term_L(m_l_terms_workspace.to_term(), tout) << std::endl;);
subs_indexed_vector_with_S_and_fresh(q);
// if(
// fix_vars(term_to_tighten + open_ml(m_tmp_l)) !=
@ -1421,13 +1444,13 @@ namespace lp {
print_term_o(create_term_from_ind_c(), tout) << std::endl;
tout << "term_to_tighten:";
print_lar_term_L(term_to_tighten, tout) << std::endl;
tout << "m_tmp_l:"; print_lar_term_L(m_term_with_index.to_term(), tout) << std::endl;
tout << "m_tmp_l:"; print_lar_term_L(m_l_terms_workspace.to_term(), tout) << std::endl;
tout << "open_ml:";
print_lar_term_L(open_ml(m_term_with_index.to_term()), tout) << std::endl;
print_lar_term_L(open_ml(m_l_terms_workspace.to_term()), tout) << std::endl;
tout << "term_to_tighten + open_ml:";
print_term_o(term_to_tighten + open_ml(m_term_with_index.to_term()), tout)
print_term_o(term_to_tighten + open_ml(m_l_terms_workspace.to_term()), tout)
<< std::endl;
term_o ls = fix_vars(term_to_tighten + open_ml(m_term_with_index.to_term()));
term_o ls = fix_vars(term_to_tighten + open_ml(m_l_terms_workspace.to_term()));
tout << "ls:"; print_term_o(ls,tout) << std::endl;
term_o rs = term_to_lar_solver(remove_fresh_vars(create_term_from_ind_c()));
tout << "rs:"; print_term_o(rs, tout ) << std::endl;
@ -1438,9 +1461,9 @@ namespace lp {
);
SASSERT(
fix_vars(term_to_tighten + open_ml(m_term_with_index.to_term())) ==
fix_vars(term_to_tighten + open_ml(m_l_terms_workspace.to_term())) ==
term_to_lar_solver(remove_fresh_vars(create_term_from_ind_c())));
mpq g = gcd_of_coeffs(m_indexed_work_vector, true);
mpq g = gcd_of_coeffs(m_substitution_workspace.m_data, true);
TRACE("dioph_eq", tout << "after process_q_with_S\nt:";
print_term_o(create_term_from_ind_c(), tout) << std::endl;
tout << "g:" << g << std::endl;
@ -1474,7 +1497,7 @@ namespace lp {
if (m_c > rs || (is_strict && m_c == rs)) {
u_dependency* dep =
lra.join_deps(explain_fixed(lra.get_term(j)),
explain_fixed_in_meta_term(m_term_with_index.m_data));
explain_fixed_in_meta_term(m_l_terms_workspace.m_data));
dep = lra.join_deps(
dep, lra.get_bound_constraint_witnesses_for_column(j));
for (constraint_index ci : lra.flatten(dep)) {
@ -1487,7 +1510,7 @@ namespace lp {
if (m_c < rs || (is_strict && m_c == rs)) {
u_dependency* dep =
lra.join_deps(explain_fixed(lra.get_term(j)),
explain_fixed_in_meta_term(m_term_with_index.m_data));
explain_fixed_in_meta_term(m_l_terms_workspace.m_data));
dep = lra.join_deps(
dep, lra.get_bound_constraint_witnesses_for_column(j));
for (constraint_index ci : lra.flatten(dep)) {
@ -1497,7 +1520,7 @@ namespace lp {
}
}
// m_indexed_work_vector contains the coefficients of the term
// m_work_vector_1 contains the coefficients of the term
// m_c contains the constant term
// m_tmp_l is the linear combination of the equations that removes the
// substituted variables.
@ -1542,7 +1565,7 @@ namespace lp {
lconstraint_kind kind =
upper ? lconstraint_kind::LE : lconstraint_kind::GE;
u_dependency* dep = prev_dep;
dep = lra.join_deps(dep, explain_fixed_in_meta_term(m_term_with_index.m_data));
dep = lra.join_deps(dep, explain_fixed_in_meta_term(m_l_terms_workspace.m_data));
u_dependency* j_bound_dep = upper
? lra.get_column_upper_bound_witness(j)
: lra.get_column_lower_bound_witness(j);
@ -2192,21 +2215,15 @@ namespace lp {
return r;
}
void make_space_in_work_vector(unsigned j) {
if (j >= m_indexed_work_vector.data_size())
m_indexed_work_vector.resize(j + 1);
}
void open_l_term_to_work_vector(unsigned ei, mpq& c) {
m_indexed_work_vector.clear();
m_substitution_workspace.clear();
for (const auto & p: m_l_matrix.m_rows[ei]) {
const lar_term& t = lra.get_term(p.var());
for (const auto & q: t.ext_coeffs()) {
if (is_fixed(q.var())) {
c += p.coeff()*q.coeff()*lia.lower_bound(q.var()).x;
} else {
make_space_in_work_vector(q.var());
m_indexed_work_vector.add_value_at_index(q.var(), p.coeff() * q.coeff());
m_substitution_workspace.add(p.coeff() * q.coeff(), q.var());
}
}
}
@ -2214,11 +2231,10 @@ namespace lp {
// it clears the row, and puts the term in the work vector
void move_row_to_work_vector(unsigned ei) {
m_indexed_work_vector.clear();
m_indexed_work_vector.resize(m_e_matrix.column_count());
m_substitution_workspace.clear();
auto& row = m_e_matrix.m_rows[ei];
for (const auto& cell : row)
m_indexed_work_vector.set_value(cell.coeff(), cell.var());
m_substitution_workspace.add(cell.coeff(), cell.var());
clear_e_row(ei);
}