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minimize_dfa: use the twa_graph interface

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Fixes #233, although more cleanup would be welcome.

* spot/twaalgos/minimize.cc: Replace the uses of twa methods by
twa_graph methods, and simplify some data structures.
* tests/core/acc_word.test, tests/core/readsave.test,
tests/python/automata.ipynb: Adjust changed output due
to different data structures.
This commit is contained in:
Alexandre Duret-Lutz 2017-02-22 16:30:10 +01:00
parent 469d8067e0
commit 172bee495a
4 changed files with 215 additions and 257 deletions
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168
spot/twaalgos/minimize.cc
View file

@ -51,21 +51,19 @@ namespace spot
{
// This is called hash_set for historical reason, but we need the
// order inside hash_set to be deterministic.
typedef std::set<const state*, state_ptr_less_than> hash_set;
typedef state_map<unsigned> hash_map;
typedef std::set<unsigned> hash_set;
namespace
{
static std::ostream&
dump_hash_set(const hash_set* hs,
const const_twa_ptr& aut,
std::ostream& out)
{
out << '{';
const char* sep = "";
for (hash_set::const_iterator i = hs->begin(); i != hs->end(); ++i)
for (auto i: *hs)
{
out << sep << aut->format_state(*i);
out << sep << i;
sep = ", ";
}
out << '}';
@ -73,47 +71,35 @@ namespace spot
}
static std::string
format_hash_set(const hash_set* hs, const_twa_ptr aut)
format_hash_set(const hash_set* hs)
{
std::ostringstream s;
dump_hash_set(hs, aut, s);
dump_hash_set(hs, s);
return s.str();
}
// Find all states of an automaton.
static void
build_state_set(const const_twa_ptr& a, hash_set* seen)
build_state_set(const const_twa_graph_ptr& a, hash_set* seen)
{
std::queue<const state*> tovisit;
// Perform breadth-first traversal.
const state* init = a->get_init_state();
tovisit.push(init);
std::stack<unsigned> todo;
unsigned init = a->get_init_state_number();
todo.push(init);
seen->insert(init);
while (!tovisit.empty())
while (!todo.empty())
{
const state* src = tovisit.front();
tovisit.pop();
for (auto sit: a->succ(src))
{
const state* dst = sit->dst();
// Is it a new state ?
if (seen->find(dst) == seen->end())
{
// Register the successor for later processing.
tovisit.push(dst);
seen->insert(dst);
}
else
dst->destroy();
}
unsigned s = todo.top();
todo.pop();
for (auto& e: a->out(s))
if (seen->insert(e.dst).second)
todo.push(e.dst);
}
}
// From the base automaton and the list of sets, build the minimal
// resulting automaton
static twa_graph_ptr
build_result(const const_twa_ptr& a,
build_result(const const_twa_graph_ptr& a,
std::list<hash_set*>& sets,
hash_set* final)
{
@ -122,59 +108,46 @@ namespace spot
res->copy_ap_of(a);
res->prop_state_acc(true);
// For each set, create a state in the resulting automaton.
// For a state s, state_num[s] is the number of the state in the minimal
// automaton.
hash_map state_num;
std::list<hash_set*>::iterator sit;
for (sit = sets.begin(); sit != sets.end(); ++sit)
{
hash_set::iterator hit;
hash_set* h = *sit;
unsigned num = res->new_state();
for (hit = h->begin(); hit != h->end(); ++hit)
state_num[*hit] = num;
}
// For each transition in the initial automaton, add the corresponding
// transition in res.
// For each set, create a state in the output automaton. For an
// input state s, state_num[s] is the corresponding the state in
// the output automaton.
std::vector<unsigned> state_num(a->num_states(), -1U);
{
unsigned num = res->new_states(sets.size());
for (hash_set* h: sets)
{
for (unsigned s: *h)
state_num[s] = num;
++num;
}
}
if (!final->empty())
res->set_buchi();
for (sit = sets.begin(); sit != sets.end(); ++sit)
// For each transition in the initial automaton, add the
// corresponding transition in res.
for (hash_set* h: sets)
{
hash_set* h = *sit;
// Pick one state.
const state* src = *h->begin();
unsigned src = *h->begin();
unsigned src_num = state_num[src];
bool accepting = (final->find(src) != final->end());
// Connect it to all destinations.
for (auto succit: a->succ(src))
for (auto& e: a->out(src))
{
const state* dst = succit->dst();
hash_map::const_iterator i = state_num.find(dst);
dst->destroy();
if (i == state_num.end()) // Ignore useless destinations.
unsigned dn = state_num[e.dst];
if ((int)dn < 0) // Ignore useless destinations.
continue;
res->new_acc_edge(src_num, i->second,
succit->cond(), accepting);
res->new_acc_edge(src_num, dn, e.cond, accepting);
}
}
res->merge_edges();
if (res->num_states() > 0)
{
const state* init_state = a->get_init_state();
unsigned init_num = state_num[init_state];
init_state->destroy();
res->set_init_state(init_num);
}
res->set_init_state(state_num[a->get_init_state_number()]);
else
{
res->set_init_state(res->new_state());
}
res->set_init_state(res->new_state());
return res;
}
@ -275,7 +248,7 @@ namespace spot
// The list of equivalent states.
partition_t done;
hash_map state_set_map;
std::vector<unsigned> state_set_map(det_a->num_states(), -1U);
// Size of det_a
unsigned size = final->size() + non_final->size();
@ -300,9 +273,8 @@ namespace spot
cur_run.emplace_back(final);
else
done.emplace_back(final);
for (hash_set::const_iterator i = final->begin();
i != final->end(); ++i)
state_set_map[*i] = set_num;
for (auto i: *final)
state_set_map[i] = set_num;
final_copy = new hash_set(*final);
}
@ -321,9 +293,8 @@ namespace spot
cur_run.emplace_back(non_final);
else
done.emplace_back(non_final);
for (hash_set::const_iterator i = non_final->begin();
i != non_final->end(); ++i)
state_set_map[*i] = num;
for (auto i: *non_final)
state_set_map[i] = num;
}
else
{
@ -345,21 +316,17 @@ namespace spot
hash_set* cur = cur_run.front();
cur_run.pop_front();
trace << "processing " << format_hash_set(cur, det_a)
trace << "processing " << format_hash_set(cur)
<< std::endl;
hash_set::iterator hi;
bdd_states_map bdd_map;
for (hi = cur->begin(); hi != cur->end(); ++hi)
for (unsigned src: *cur)
{
const state* src = *hi;
bdd f = bddfalse;
for (auto si: det_a->succ(src))
for (auto si: det_a->out(src))
{
const state* dst = si->dst();
hash_map::const_iterator i = state_set_map.find(dst);
dst->destroy();
if (i == state_set_map.end())
unsigned i = state_set_map[si.dst];
if ((int)i < 0)
// The destination state is not in our
// partition. This can happen if the initial
// FINAL and NON_FINAL supplied to the algorithm
@ -367,7 +334,7 @@ namespace spot
// want to ignore some useless states). Simply
// ignore these states here.
continue;
f |= (bdd_ithvar(i->second) & si->cond());
f |= (bdd_ithvar(i) & si.cond);
}
// Have we already seen this formula ?
@ -386,11 +353,11 @@ namespace spot
}
}
bdd_states_map::iterator bsi = bdd_map.begin();
auto bsi = bdd_map.begin();
if (bdd_map.size() == 1)
{
// The set was not split.
trace << "set " << format_hash_set(bsi->second, det_a)
trace << "set " << format_hash_set(bsi->second)
<< " was not split" << std::endl;
next_run.emplace_back(bsi->second);
}
@ -417,19 +384,18 @@ namespace spot
num = *free_var.begin();
free_var.erase(free_var.begin());
used_var[num] = set->size();
for (hash_set::iterator hit = set->begin();
hit != set->end(); ++hit)
state_set_map[*hit] = num;
// Trivial sets can't be splitted any further.
for (unsigned s: *set)
state_set_map[s] = num;
// Trivial sets can't be split any further.
if (set->size() == 1)
{
trace << "set " << format_hash_set(set, det_a)
trace << "set " << format_hash_set(set)
<< " is minimal" << std::endl;
done.emplace_back(set);
}
else
{
trace << "set " << format_hash_set(set, det_a)
trace << "set " << format_hash_set(set)
<< " should be processed further" << std::endl;
next_run.emplace_back(set);
}
@ -448,8 +414,8 @@ namespace spot
#ifdef TRACE
trace << "Final partition: ";
for (partition_t::const_iterator i = done.begin(); i != done.end(); ++i)
trace << format_hash_set(*i, det_a) << ' ';
for (hash_set* hs: done)
trace << format_hash_set(hs) << ' ';
trace << std::endl;
#endif
@ -458,15 +424,9 @@ namespace spot
// Free all the allocated memory.
delete final_copy;
hash_map::iterator hit;
for (hit = state_set_map.begin(); hit != state_set_map.end();)
{
hash_map::iterator old = hit++;
old->first->destroy();
}
std::list<hash_set*>::iterator it;
for (it = done.begin(); it != done.end(); ++it)
delete *it;
for (hash_set* hs: done)
delete hs;
return res;
}
@ -588,8 +548,8 @@ namespace spot
if (!is_useless)
{
hash_set* dest_set = (d[m] & 1) ? non_final : final;
for (auto s: sm.states_of(m))
dest_set->insert(det_a->state_from_number(s));
auto& con = sm.states_of(m);
dest_set->insert(con.begin(), con.end());
}
}
}

16
tests/core/acc_word.test
View file

@ -1,6 +1,6 @@
#!/bin/sh
# -*- coding: utf-8 -*-
# Copyright (C) 2016 Laboratoire de Recherche et Développement
# Copyright (C) 2016, 2017 Laboratoire de Recherche et Développement
# de l'Epita (LRDE).
#
# This file is part of Spot, a model checking library.
@ -99,13 +99,13 @@ cat >expected <<EOF
HOA: v1.1
name: "Fa & Fb"
States: 4
Start: 3
Start: 2
AP: 2 "a" "b"
acc-name: Buchi
Acceptance: 1 Inf(0)
properties: trans-labels explicit-labels state-acc complete
properties: deterministic stutter-invariant terminal
spot.highlight.edges: 1 3 2 3 4 2 7 3 8 2 9 3
spot.highlight.edges: 1 3 2 3 5 3 6 3 7 2 8 2
--BODY--
State: 0 {0}
[t] 0
@ -113,13 +113,13 @@ State: 1
[1] 0
[!1] 1
State: 2
[0] 0
[!0] 2
State: 3
[0&1] 0
[0&!1] 1
[!0&1] 2
[!0&!1] 3
[!0&!1] 2
[!0&1] 3
State: 3
[0] 0
[!0] 3
--END--
EOF
diff expected out

1
tests/core/readsave.test
View file

@ -557,7 +557,6 @@ digraph G {
2 [label="1", peripheries=2]
3 [label="2", peripheries=2]
4 [label="3", peripheries=2]
u4 [label="...", shape=none, width=0, height=0]
}
EOF

287
tests/python/automata.ipynb
View file

@ -15,10 +15,9 @@
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython3",
"version": "3.4.3+"
"version": "3.5.3"
},
"name": "",
"signature": "sha256:4ddb9b8fc1c41bacd7e47f70861303cde0ad425f842ade8e1f23ee74738914b0"
"name": ""
},
"nbformat": 3,
"nbformat_minor": 0,
@ -178,7 +177,7 @@
"</svg>\n"
],
"text": [
"<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fe334de9900> >"
"<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f7fe56a0540> >"
]
}
],
@ -205,119 +204,119 @@
"output_type": "pyout",
"prompt_number": 3,
"svg": [
"<svg height=\"351pt\" viewBox=\"0.00 0.00 226.36 351.00\" width=\"226pt\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n",
"<svg height=\"351pt\" viewBox=\"0.00 0.00 220.18 351.00\" width=\"220pt\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n",
"<g class=\"graph\" id=\"graph0\" transform=\"scale(1 1) rotate(0) translate(4 347)\">\n",
"<title>G</title>\n",
"<polygon fill=\"white\" points=\"-4,4 -4,-347 222.356,-347 222.356,4 -4,4\" stroke=\"none\"/>\n",
"<polygon fill=\"white\" points=\"-4,4 -4,-347 216.176,-347 216.176,4 -4,4\" stroke=\"none\"/>\n",
"<!-- I -->\n",
"<!-- 0 -->\n",
"<g class=\"node\" id=\"node2\"><title>0</title>\n",
"<ellipse cx=\"120.356\" cy=\"-287\" fill=\"none\" rx=\"18\" ry=\"18\" stroke=\"black\"/>\n",
"<text font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"middle\" x=\"120.356\" y=\"-283.3\">0</text>\n",
"<ellipse cx=\"116.176\" cy=\"-287\" fill=\"none\" rx=\"18\" ry=\"18\" stroke=\"black\"/>\n",
"<text font-family=\"Times,serif\" font-size=\"14.00\" text-anchor=\"middle\" x=\"116.176\" y=\"-283.3\">0</text>\n",
"</g>\n",
"<!-- I&#45;&gt;0 -->\n",
"<g class=\"edge\" id=\"edge1\"><title>I-&gt;0</title>\n",
"<path d=\"M120.356,-341.845C120.356,-340.206 120.356,-325.846 120.356,-312.368\" fill=\"none\" stroke=\"black\"/>\n",
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"<path d=\"M116.176,-341.845C116.176,-340.206 116.176,-325.846 116.176,-312.368\" fill=\"none\" stroke=\"black\"/>\n",
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],
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],
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],
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],
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"text": [
"<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fe33c747540> >"
"<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f7fe4da4090> >"
]
}
],
@ -3588,4 +3587,4 @@
"metadata": {}
}
]
}
}