dualize: improve performance on small automata with large |AP|
For issue #566. * spot/twaalgos/dualize.cc (dualizer::copy_edges): Implement another loop to be used when the number of outgoing edges of a state is smaller than the number of AP. * tests/core/566.test: New file. * tests/Makefile.am: Add it. * NEWS: Mention the improvement.
This commit is contained in:
Alexandre Duret-Lutz
parent
75e552fdac
commit
1e512d422b
4 changed files with 205 additions and 16 deletions
4
NEWS
4
NEWS
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@ -148,6 +148,10 @@ New in spot 2.11.6.dev (not yet released)
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should raise an exception of return nullptr if it requires more
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acceptance sets than supported.
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- spot::dualize() learned a trick to be faster on states that have
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less outgoing edges than atomic proposition declared on the
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automaton. (Issue #566.)
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- [Potential backward incompatibility] spot::dualize() does not call
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cleanup_acceptance() anymore. This change ensures that the dual
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of a Büchi automaton will always be a co-Büchi automaton.
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@ -146,17 +146,23 @@ namespace spot
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{
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std::vector<unsigned> st;
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unsigned n = aut_->num_states();
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unsigned n_ap = res->ap().size();
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std::vector<bdd> labels;
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for (unsigned i = 0; i < n; ++i)
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{
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bdd delta = dualized_transition_function(i);
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unsigned n_succs;
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bdd delta = dualized_transition_function(i, n_succs);
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if (delta == bddfalse)
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continue;
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bdd ap = bdd_exist(bdd_support(delta), all_vars_);
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bdd letters = bdd_exist(delta, all_vars_);
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for (bdd oneletter: minterms_of(letters, ap))
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{
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minato_isop isop(bdd_restrict(delta, oneletter));
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// Create edges with label LABEL, and destinations states
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// encoded in the Boolean function RESTRICTED_DELTA.
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auto create_edges = [&](bdd label, bdd restricted_delta) {
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minato_isop isop(restricted_delta);
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bdd dest;
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while ((dest = isop.next()) != bddfalse)
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{
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st.clear();
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@ -167,8 +173,47 @@ namespace spot
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if (aut_->prop_state_acc())
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m = aut_->state_acc_sets(i);
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}
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res->new_univ_edge(i, st.begin(), st.end(), oneletter, m);
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res->new_univ_edge(i, st.begin(), st.end(), label, m);
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}
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};
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// Iterating over all mineterms can be very slow when |AP|
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// is large (see issue #566) . The else branch implements
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// another approach that should be exponential in the
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// number of successors instead of in the number of atomic
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// propositions.
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if (n_succs > n_ap)
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{
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for (bdd oneletter: minterms_of(letters, ap))
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create_edges(oneletter, bdd_restrict(delta, oneletter));
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}
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else
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{
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// gather all labels in the successors of state,
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// and split those labels so they are all disjoint.
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//
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// LABELS may have 2^{n_succ} elements after this
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// loop, but since n_succ <= n_ap, we expect this
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// approach to be faster.
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labels.clear();
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labels.reserve(n_succs);
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labels.push_back(bddtrue);
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for (auto& e: aut_->out(i))
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{
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// make sure we don't realloc during the loop
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labels.reserve(labels.size() * 2);
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// Do not use a range-based or iterator-based for
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// loop here, as push_back invalidates the end
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// iterator.
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for (unsigned cur = 0, sz = labels.size(); cur < sz; ++cur)
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if (bdd common = labels[cur] & e.cond; common != bddfalse)
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{
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labels[cur] -= e.cond;
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labels.push_back(common);
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}
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}
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for (auto& cur: labels)
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create_edges(cur, bdd_relprod(cur, delta, res->ap_vars()));
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}
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}
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}
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@ -223,14 +268,16 @@ namespace spot
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}
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// Returns the dualized transition function of any input state as a bdd.
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bdd dualized_transition_function(unsigned state_id)
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bdd dualized_transition_function(unsigned state_id, unsigned& n_succ)
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{
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n_succ = 0;
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if (state_to_var_[state_id] == bddtrue)
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return bddfalse;
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bdd res = bddtrue;
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for (auto& e : aut_->out(state_id))
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{
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++n_succ;
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bdd dest = bddfalse;
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for (unsigned d : aut_->univ_dests(e))
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dest |= state_to_var_[d];
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@ -220,6 +220,7 @@ TESTS_twa = \
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core/385.test \
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core/521.test \
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core/522.test \
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core/566.test \
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core/acc.test \
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core/acc2.test \
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core/bdddict.test \
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137
tests/core/566.test
Executable file
137
tests/core/566.test
Executable file
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@ -0,0 +1,137 @@
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#!/bin/sh
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# -*- coding: utf-8 -*-
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# Copyright (C) by the Spot authors, see the AUTHORS file for details.
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#
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# This file is part of Spot, a model checking library.
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#
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# Spot is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# Spot is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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# License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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. ./defs
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set -e
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cat >21.hoa <<EOF
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HOA: v1 States: 5 Start: 0 AP: 21 "__ap6" "__ap10" "__ap57" "__ap61"
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"__ap63" "__ap67" "__ap97" "__ap94" "__ap96" "__ap111" "__ap114" "__ap117"
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"__ap120" "__ap121" "__ap124" "__ap125" "__ap128" "__ap129" "__ap132"
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"__ap133" "__ap135" acc-name: Buchi Acceptance: 1 Inf(0) properties:
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trans-labels explicit-labels state-acc very-weak --BODY-- State: 0
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[!0&!1&!2&!3&!4&!5&!6&!7&!8&!9&!10&!11&!12&!13&!14&!15&!16&!17&!18&!19&20
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1
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0&!1&!2&!3&!4&!5&!6&!7&!8&!9&!10&!11&!12&!13&!14&!15&!16&!17&!18&!19&!20]
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|
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!0&!1&!2&3&!4&!5&!6&!7&!8&!9&!10&!11&!12&!13&!14&!15&!16&!17&!18&!19&!20 |
|
||||
!0&!1&2&!3&!4&!5&!6&!7&!8&!9&!10&!11&!12&!13&!14&!15&!16&!17&!18&!19&!20 |
|
||||
!0&1&!2&!3&!4&!5&!6&!7&!8&!9&!10&!11&!12&!13&!14&!15&!16&!17&!18&!19&!20 |
|
||||
0&!1&!2&!3&!4&!5&!6&!7&!8&!9&!10&!11&!12&!13&!14&!15&!16&!17&!18&!19&!20]
|
||||
4 State: 1
|
||||
[!0&!1&!2&!3&!4&!5&!6&!7&!8&!9&!10&!11&!12&!13&!14&!15&!16&!17&!18&!19&!20]
|
||||
1
|
||||
[!0&!1&!2&!3&!4&!5&!6&!7&!8&!9&!10&!11&!12&!13&!14&!15&!16&!17&!18&!19&!20]
|
||||
2 State: 2 {0}
|
||||
[!0&!1&!2&!3&!4&!5&!6&!7&!8&!9&!10&!11&!12&!13&!14&!15&!16&!17&!18&!19&!20]
|
||||
2 State: 3
|
||||
[!0&!1&!2&!3&!4&!5&!6&!7&!8&!9&!10&!11&!12&!13&!14&!15&!16&!17&!18&!19&!20]
|
||||
1
|
||||
[!0&!1&!2&!3&!4&!5&!6&!7&!8&!9&!10&!11&!12&!13&!14&!15&!16&!17&!18&!19&!20]
|
||||
2
|
||||
[!0&!1&!2&!3&!4&!5&!6&!7&!8&!9&!10&!11&!12&!13&!14&!15&!16&!17&!18&!19&!20]
|
||||
3
|
||||
[!0&!1&!2&!3&!4&!5&!6&!7&!8&!9&!10&!11&!12&!13&!14&!15&!16&!17&!18&!19&!20]
|
||||
4 State: 4
|
||||
[!0&!1&!2&!3&!4&!5&!6&!7&!8&!9&!10&!11&!12&!13&!14&!15&!16&!17&!18&!19&!20]
|
||||
2
|
||||
[!0&!1&!2&!3&!4&!5&!6&!7&!8&!9&!10&!11&!12&!13&!14&!15&!16&!17&!18&!19&!20]
|
||||
4 --END--
|
||||
EOF
|
||||
|
||||
# The real test would be to check that this result is instantaneous,
|
||||
# but it is difficult to test so in the test suite.
|
||||
res=`autfilt --dualize 21.hoa --stats='%S %E %T %s %e %t'`
|
||||
test "$res" = "5 13 85 6 13 12582912"
|
||||
Loading…
Add table
Add a link
Reference in a new issue