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simulation: fix merging transiant SCCs

Browse source 
This fixes #452, and also fix a bug related to transiant SCCs
incorrectly merged in cosimulation: the source of the edges was
updated without fixing the chaining of the edges.

* spot/twaalgos/simulation.cc: Fix all the above.
* tests/python/simstate.py: Add test case from issue #452.
* tests/core/det.test, tests/core/ltlsynt.test,
tests/core/satmin.test: Lower expected sizes.
* tests/python/decompose.ipynb: Adjust for changed order.
This commit is contained in:
Alexandre Duret-Lutz 2021-04-19 23:38:50 +02:00
parent cfa3417449
commit fca6513604
6 changed files with 203 additions and 142 deletions
Download patch file Download diff file Expand all files Collapse all files

43
spot/twaalgos/simulation.cc
View file

@ -550,16 +550,16 @@ namespace spot
// All states in p.second have the same class, so just // All states in p.second have the same class, so just
// pick the class of the first one first one. // pick the class of the first one first one.
bdd src = previous_class_[p->second.front()]; bdd src = previous_class_[p->second.front()];
assert(gb->get_state(src.id()) == srcst);
// Get the signature to derive successors. // Get the signature to derive successors.
bdd sig = compute_sig(p->second.front()); bdd sig = compute_sig(p->second.front());
assert(signatures.size() == srcst);
signatures.push_back(sig);
if (Cosimulation) if (Cosimulation)
sig = bdd_compose(sig, bddfalse, bdd_var(bdd_initial)); sig = bdd_compose(sig, bddfalse, bdd_var(bdd_initial));
assert(gb->get_state(src.id()) == srcst);
assert(signatures.size() == srcst);
signatures.push_back(bdd_exist(sig, all_proms_));
// Get all the variables in the signature. // Get all the variables in the signature.
bdd sup_sig = bdd_support(sig); bdd sup_sig = bdd_support(sig);
@ -656,6 +656,7 @@ namespace spot
} }
} }
bool need_another_pass = false;
// Attempt to merge trivial SCCs // Attempt to merge trivial SCCs
if (!record_implications_ && res->num_states() > 1) if (!record_implications_ && res->num_states() > 1)
{ {
@ -664,7 +665,10 @@ namespace spot
unsigned nstates = res->num_states(); unsigned nstates = res->num_states();
std::vector<unsigned> redirect(nstates); std::vector<unsigned> redirect(nstates);
std::iota(redirect.begin(), redirect.end(), 0); std::iota(redirect.begin(), redirect.end(), 0);
for (unsigned s = 0; s < nstates; ++s)
signatures[s] = bdd_exist(signatures[s], all_proms_);
bool changed = false; bool changed = false;
bool unchanged = false;
for (unsigned scc = 0; scc < nscc; ++scc) for (unsigned scc = 0; scc < nscc; ++scc)
if (si.is_trivial(scc)) if (si.is_trivial(scc))
{ {
@ -676,8 +680,10 @@ namespace spot
{ {
changed = true; changed = true;
redirect[s] = i; redirect[s] = i;
break; goto if_changed;
} }
unchanged = true;
if_changed:;
} }
if (changed) if (changed)
{ {
@ -688,16 +694,28 @@ namespace spot
for (auto& e: res->edges()) for (auto& e: res->edges())
e.dst = redirect[e.dst]; e.dst = redirect[e.dst];
res->set_init_state(redirect[res->get_init_state_number()]); res->set_init_state(redirect[res->get_init_state_number()]);
} if (Cosimulation)
// Fix chaining of edges with changed sources.
res->merge_edges();
if (unchanged)
need_another_pass = true;
} }
// Remove unreachable states.
// In the case of co-simulation, changing the sources
// of edges, might have created dead states.
//
// If we recorded implications for the determinization // If we recorded implications for the determinization
// procedure, we should not remove unreachable states, as that // procedure, we should not remove unreachable states, as
// will invalidate the contents of the IMPLICATIONS vector. // that will invalidate the contents of the IMPLICATIONS
// It's OK not to purge the result, as the determinization // vector. It's OK not to purge the result in that case,
// will only explore the reachable part anyway. // as the determinization will only explore the reachable
if (!record_implications_) // part anyway.
if (Cosimulation)
res->purge_dead_states();
else
res->purge_unreachable_states(); res->purge_unreachable_states();
}
// Push the common incoming sets to the outgoing edges. // Push the common incoming sets to the outgoing edges.
// Doing so cancels the preprocessing we did in the other // Doing so cancels the preprocessing we did in the other
@ -751,7 +769,12 @@ namespace spot
res->prop_universal(true); res->prop_universal(true);
if (Sba) if (Sba)
res->prop_state_acc(true); res->prop_state_acc(true);
if (!need_another_pass)
return res; return res;
direct_simulation<Cosimulation, Sba> sim(res);
return sim.run();
} }

4
tests/core/det.test
View file

@ -1,6 +1,6 @@
#!/bin/sh #!/bin/sh
# -*- coding: utf-8 -*- # -*- coding: utf-8 -*-
# Copyright (C) 2013-2020 Laboratoire de Recherche et Développement de # Copyright (C) 2013-2021 Laboratoire de Recherche et Développement de
# l'Epita (LRDE). # l'Epita (LRDE).
# #
# This file is part of Spot, a model checking library. # This file is part of Spot, a model checking library.
@ -42,7 +42,7 @@ cat >formulas <<'EOF'
1,9,X(a R ((!b & F!c) M X!a)) 1,9,X(a R ((!b & F!c) M X!a))
1,2,XG!a R Fb 1,2,XG!a R Fb
1,4,GFc | (a & Fb) 1,4,GFc | (a & Fb)
1,6,X(a R (Fb R F!b)) 1,4,X(a R (Fb R F!b))
1,1,G(Xa M Fa) 1,1,G(Xa M Fa)
1,3,X(Gb | GFa) 1,3,X(Gb | GFa)
1,9,X(Gc | XG((b & Ga) | (!b & F!a))) 1,9,X(Gc | XG((b & Ga) | (!b & F!a)))

4
tests/core/ltlsynt.test
View file

@ -1,6 +1,6 @@
#! /bin/sh #! /bin/sh
# -*- coding: utf-8 -*- # -*- coding: utf-8 -*-
# Copyright (C) 2017, 2019, 2020 Laboratoire de Recherche et # Copyright (C) 2017, 2019-2021 Laboratoire de Recherche et
# Développement de l'Epita (LRDE). # Développement de l'Epita (LRDE).
# #
# This file is part of Spot, a model checking library. # This file is part of Spot, a model checking library.
@ -376,6 +376,6 @@ diff out exp
f='Fp0 U XX((p0 & F!p1) | (!p0 & Gp1))' f='Fp0 U XX((p0 & F!p1) | (!p0 & Gp1))'
ltlsynt --verbose --algo=ps --outs=p1 --ins=p0 -f "$f" 2>err ltlsynt --verbose --algo=ps --outs=p1 --ins=p0 -f "$f" 2>err
grep 'DPA has 14 states' err grep 'DPA has 13 states' err
ltlsynt --verbose -x wdba-minimize=1 --algo=ps --outs=p1 --ins=p0 -f "$f" 2>err ltlsynt --verbose -x wdba-minimize=1 --algo=ps --outs=p1 --ins=p0 -f "$f" 2>err
grep 'DPA has 12 states' err grep 'DPA has 12 states' err

8
tests/core/satmin.test
View file

@ -1,7 +1,7 @@
#!/bin/sh #!/bin/sh
# -*- coding: utf-8 -*- # -*- coding: utf-8 -*-
# Copyright (C) 2013, 2017, 2018, 2019 Laboratoire de Recherche et Développement # Copyright (C) 2013, 2017-2019, 2021 Laboratoire de Recherche et
# de l'Epita (LRDE). # Développement de l'Epita (LRDE).
# #
# This file is part of Spot, a model checking library. # This file is part of Spot, a model checking library.
# #
@ -1300,8 +1300,8 @@ cat >expected <<'EOF'
"!((G(F(p0))) | ((p1) & (F(p2))))","15",5 "!((G(F(p0))) | ((p1) & (F(p2))))","15",5
"!((G(F(p0))) | ((p1) & (F(p2))))","16",5 "!((G(F(p0))) | ((p1) & (F(p2))))","16",5
"!((G(F(p0))) | ((p1) & (F(p2))))","17",5 "!((G(F(p0))) | ((p1) & (F(p2))))","17",5
"X((p0) R ((F(p1)) R (F(!(p1)))))","1",6 "X((p0) R ((F(p1)) R (F(!(p1)))))","1",4
"X((p0) R ((F(p1)) R (F(!(p1)))))","2",6 "X((p0) R ((F(p1)) R (F(!(p1)))))","2",4
"X((p0) R ((F(p1)) R (F(!(p1)))))","3",4 "X((p0) R ((F(p1)) R (F(!(p1)))))","3",4
"X((p0) R ((F(p1)) R (F(!(p1)))))","4",4 "X((p0) R ((F(p1)) R (F(!(p1)))))","4",4
"X((p0) R ((F(p1)) R (F(!(p1)))))","6",4 "X((p0) R ((F(p1)) R (F(!(p1)))))","6",4

242
tests/python/decompose.ipynb
View file

@ -200,7 +200,7 @@
"</svg>\n" "</svg>\n"
], ],
"text/plain": [ "text/plain": [
"<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f1aa01ba3c0> >" "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f56404b14b0> >"
] ]
}, },
"execution_count": 2, "execution_count": 2,
@ -330,7 +330,7 @@
"</svg>\n" "</svg>\n"
], ],
"text/plain": [ "text/plain": [
"<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f1aa01ba2a0> >" "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f56404b11b0> >"
] ]
}, },
"execution_count": 3, "execution_count": 3,
@ -489,7 +489,7 @@
"</svg>\n" "</svg>\n"
], ],
"text/plain": [ "text/plain": [
"<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f1aa01ba1b0> >" "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f56404b1270> >"
] ]
}, },
"execution_count": 4, "execution_count": 4,
@ -587,7 +587,7 @@
"</svg>\n" "</svg>\n"
], ],
"text/plain": [ "text/plain": [
"<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f1aa01ba9c0> >" "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f56404b18d0> >"
] ]
}, },
"execution_count": 5, "execution_count": 5,
@ -669,7 +669,7 @@
"</svg>\n" "</svg>\n"
], ],
"text/plain": [ "text/plain": [
"<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f1aa00b6240> >" "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f56404b1c00> >"
] ]
}, },
"execution_count": 6, "execution_count": 6,
@ -796,7 +796,7 @@
"</svg>\n" "</svg>\n"
], ],
"text/plain": [ "text/plain": [
"<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f1aa00b6120> >" "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f56404b1f60> >"
] ]
}, },
"metadata": {}, "metadata": {},
@ -941,7 +941,7 @@
"</svg>\n" "</svg>\n"
], ],
"text/plain": [ "text/plain": [
"<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f1aa01bae40> >" "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f56404b1d80> >"
] ]
}, },
"metadata": {}, "metadata": {},
@ -1109,7 +1109,7 @@
"</svg>\n" "</svg>\n"
], ],
"text/plain": [ "text/plain": [
"<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f1aa01baea0> >" "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f56404b1f90> >"
] ]
}, },
"metadata": {}, "metadata": {},
@ -1512,7 +1512,7 @@
"</svg>\n" "</svg>\n"
], ],
"text/plain": [ "text/plain": [
"<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f1aa00b6c60> >" "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f56404b1ed0> >"
] ]
}, },
"execution_count": 8, "execution_count": 8,
@ -1898,7 +1898,7 @@
"</svg>\n" "</svg>\n"
], ],
"text/plain": [ "text/plain": [
"<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f1aa00b6510> >" "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f56404b1b70> >"
] ]
}, },
"metadata": {}, "metadata": {},
@ -2130,7 +2130,7 @@
"</svg>\n" "</svg>\n"
], ],
"text/plain": [ "text/plain": [
"<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f1aa01baea0> >" "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f56404b1f60> >"
] ]
}, },
"metadata": {}, "metadata": {},
@ -2340,7 +2340,7 @@
"</svg>\n" "</svg>\n"
], ],
"text/plain": [ "text/plain": [
"<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f1aa01bad80> >" "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f56404b1ab0> >"
] ]
}, },
"metadata": {}, "metadata": {},
@ -2728,7 +2728,7 @@
"</svg>\n" "</svg>\n"
], ],
"text/plain": [ "text/plain": [
"<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f1aa00b6570> >" "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f56404b1c90> >"
] ]
}, },
"execution_count": 10, "execution_count": 10,
@ -2889,7 +2889,7 @@
"</svg>\n" "</svg>\n"
], ],
"text/plain": [ "text/plain": [
"<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f1aa00b6e70> >" "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f5640045330> >"
] ]
}, },
"metadata": {}, "metadata": {},
@ -3028,7 +3028,7 @@
"</svg>\n" "</svg>\n"
], ],
"text/plain": [ "text/plain": [
"<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f1aa01baf00> >" "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f5640d27930> >"
] ]
}, },
"metadata": {}, "metadata": {},
@ -3043,23 +3043,23 @@
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@ -3078,109 +3078,102 @@
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@ -3533,7 +3526,7 @@
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@ -3876,7 +3869,7 @@
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@ -4211,7 +4204,7 @@
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@ -4560,7 +4553,7 @@
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@ -4781,7 +4774,7 @@
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@ -5101,7 +5094,7 @@
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@ -5498,7 +5491,7 @@
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@ -5702,7 +5695,7 @@
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], ],
"text/plain": [ "text/plain": [
"<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f1aa00c85d0> >" "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f5640045f00> >"
] ]
}, },
"metadata": {}, "metadata": {},
@ -5843,7 +5836,7 @@
"</svg>\n" "</svg>\n"
], ],
"text/plain": [ "text/plain": [
"<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f1aa00c8cf0> >" "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f5640d34ae0> >"
] ]
}, },
"execution_count": 21, "execution_count": 21,
@ -5946,7 +5939,7 @@
"</svg>\n" "</svg>\n"
], ],
"text/plain": [ "text/plain": [
"<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f1aa00c8b10> >" "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f5640045e40> >"
] ]
}, },
"execution_count": 22, "execution_count": 22,
@ -5957,6 +5950,13 @@
"source": [ "source": [
"spot.decompose_scc(si, 'a2')" "spot.decompose_scc(si, 'a2')"
] ]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": []
} }
], ],
"metadata": { "metadata": {

38
tests/python/simstate.py
View file

@ -649,3 +649,41 @@ State: 7
[0&1] 5 [0&1] 5
[1] 7 [1] 7
--END--''' --END--'''
# issue #452
aut = spot.automaton("""HOA: v1
States: 9
Start: 0
AP: 4 "p0" "p1" "p2" "p3"
Acceptance: 2 Fin(0)&Fin(1)
Alias: @p 0&1&!2&3
--BODY--
State: 0
[@p] 1 {0 1}
State: 1
[@p] 2 {0 1}
State: 2
[@p] 0 {0 1}
[@p] 2
[@p] 3 {0}
[@p] 4 {1}
State: 3
[@p] 5 {0 1}
[@p] 6 {0}
State: 4
[@p] 7 {0 1}
[@p] 8 {1}
State: 5
[@p] 8 {0 1}
State: 6
[@p] 2 {0}
[@p] 4 {0 1}
State: 7
[@p] 6 {0 1}
State: 8
[@p] 2 {1}
[@p] 3 {0 1}
--END--""")
aut = spot.simulation(aut)
assert aut.num_states() == 1