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remove_fin: ignore more useless transitions

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Do not clone transitions that are necessarily part of on accepting
cycle in the main copy of the automaton.

* spot/twaalgos/remfin.cc: Use propagate_marks_vector to ignore more
edges.
* tests/core/remfin.test, tests/python/remfin.py,
tests/python/automata.ipynb: Adjust.
* tests/sanity/style.test: Do not choke on C++17 if statements with
initializer.
This commit is contained in:
Alexandre Duret-Lutz 2020-07-24 15:38:42 +02:00
parent 91db0e1e29
commit 7fbf4e0e3c
6 changed files with 269 additions and 288 deletions
Download patch file Download diff file Expand all files Collapse all files

3
NEWS
View file

@ -48,6 +48,9 @@ New in spot 2.9.3.dev (not yet released)
- Translations for formulas such as FGp1 & FGp2 &...& FGp32 which
used to take ages are now instantaneous. (See issue #412.)
- remove_fin() learned to remove more unnecessary edges by using
propagate_marks_vector().
Bugs fixed:
- Handle xor and <-> in a more natural way when translating

35
spot/twaalgos/remfin.cc
View file

@ -26,6 +26,7 @@
#include <spot/twaalgos/isdet.hh>
#include <spot/twaalgos/mask.hh>
#include <spot/twaalgos/alternation.hh>
#include <spot/twaalgos/degen.hh>
// #define TRACE
#ifdef TRACE
@ -621,6 +622,17 @@ namespace spot
bool sbacc = res->prop_state_acc().is_true();
scc_info si(aut, scc_info_options::TRACK_STATES);
unsigned nscc = si.scc_count();
// Help remove more useless transition by propagating marks.
auto propmarks = propagate_marks_vector(aut, &si);
// Edges that are already satisfying the acceptance of the
// main copy do not need to be duplicated in the clones, so
// we fill allacc_edge to remember those. Of course this is
// only needed if the main copy can be accepting and if we
// will create clones.
std::vector<bool> allacc_edge(aut->edge_vector().size(), false);
std::vector<unsigned> state_map(nst);
for (unsigned n = 0; n < nscc; ++n)
{
@ -668,10 +680,11 @@ namespace spot
a = (t.acc & main_sets) | main_add;
res->new_edge(s, t.dst, t.cond, a);
// remember edges that are completely accepting
if (check_main_acc && main_acc.accepting(a))
allacc_edge[aut->edge_number(t)] = true;
if (check_main_acc)
if (unsigned en = aut->edge_number(t);
main_acc.accepting(a | (propmarks[en] & main_sets)))
allacc_edge[en] = true;
}
// We do not need any other copy if the SCC is non-accepting,
// of if it does not intersect any Fin.
if (!intersects_fin)
@ -693,12 +706,16 @@ namespace spot
auto ns = state_map[s];
for (auto& t: aut->out(s))
{
if ((t.acc & r) || si.scc_of(t.dst) != n
// edges that are already accepting in the
// main copy need not be copied in the
// clone, since cycles going through them
// are already accepted.
|| allacc_edge[aut->edge_number(t)])
if (unsigned en = aut->edge_number(t);
// Ignore edges have r, or that
// necessarily go through r.
((t.acc | propmarks[en]) & r)
// Ignore edges between SCCs.
|| si.scc_of(t.dst) != n
// Ignore edges that are already accepting
// in the main copy need not be copied in
// the clone.
|| allacc_edge[en])
continue;
auto nd = state_map[t.dst];
res->new_edge(ns, nd, t.cond, (t.acc & k) | a);

23
tests/core/remfin.test
View file

@ -877,14 +877,12 @@ State: 0
State: 1
[2] 0
[!2] 1
[0&2] 2
[0&!2] 3
[2] 4
[!2] 5
State: 2
[0] 2 {0 2}
State: 3
[0&2] 2 {0 2}
[0&!2] 3 {0}
State: 4
[1 | 2] 4 {1 2}
@ -1457,7 +1455,7 @@ State: 3
[1] 3
--END--
HOA: v1
States: 6
States: 5
Start: 0
AP: 3 "a" "b" "c"
acc-name: Buchi
@ -1468,25 +1466,20 @@ State: 0
[t] 0
[!1&!2] 1
[0] 2
[1 | 2] 4
[1 | 2] 3
State: 1
[2] 0
[!2] 1
[0&2] 2
[0&!2] 3
[2] 4
[!2] 5
[2] 3
[!2] 4
State: 2
[0] 2 {0}
State: 3
[0&2] 2
[0&!2] 3
[1 | 2] 3 {0}
[!1&!2] 4
State: 4
[1 | 2] 4 {0}
[!1&!2] 5
State: 5
[2] 4 {0}
[!2] 5
[2] 3 {0}
[!2] 4
--END--
EOF

487
tests/python/automata.ipynb
View file

@ -178,7 +178,7 @@
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@ -657,7 +657,7 @@
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@ -733,7 +733,7 @@
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@ -816,7 +816,7 @@
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@ -1349,7 +1349,7 @@
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@ -1463,7 +1463,7 @@
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@ -1594,7 +1594,7 @@
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@ -1816,7 +1816,7 @@
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@ -2255,91 +2220,91 @@
"<!-- 2 -->\n",
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"</g>\n",
"<!-- 1&#45;&gt;2 -->\n",
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"</g>\n",
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"<title>3</title>\n",
"<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"360\" cy=\"-51\" rx=\"18\" ry=\"18\"/>\n",
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"</g>\n",
"<!-- 1&#45;&gt;3 -->\n",
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"<title>1&#45;&gt;3</title>\n",
"<path fill=\"none\" stroke=\"black\" d=\"M160.7,-47.59C178.45,-40.5 205.44,-30.9 230,-27 265.58,-21.35 306.42,-31.84 332.45,-40.68\"/>\n",
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"</g>\n",
"<!-- 4 -->\n",
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"<title>4</title>\n",
"<ellipse fill=\"#ffffaa\" stroke=\"black\" cx=\"476\" cy=\"-100\" rx=\"18\" ry=\"18\"/>\n",
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"</g>\n",
"<!-- 1&#45;&gt;4 -->\n",
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"<title>1&#45;&gt;4</title>\n",
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"<text text-anchor=\"start\" x=\"232\" y=\"-143.8\" font-family=\"Lato\" font-size=\"14.00\">a &amp; b</text>\n",
"</g>\n",
"<!-- 2&#45;&gt;2 -->\n",
"<g id=\"edge8\" class=\"edge\">\n",
"<title>2&#45;&gt;2</title>\n",
"<path fill=\"none\" stroke=\"black\" d=\"M239.02,-84.92C236.68,-95.15 239.67,-105 248,-105 254.38,-105 257.63,-99.23 257.75,-91.93\"/>\n",
"<polygon fill=\"black\" stroke=\"black\" points=\"256.98,-84.92 260.87,-91.53 257.36,-88.4 257.74,-91.87 257.74,-91.87 257.74,-91.87 257.36,-88.4 254.61,-92.22 256.98,-84.92 256.98,-84.92\"/>\n",
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"<path fill=\"none\" stroke=\"black\" d=\"M239.02,-85.92C236.68,-96.15 239.67,-106 248,-106 254.38,-106 257.63,-100.23 257.75,-92.93\"/>\n",
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"</g>\n",
"<!-- 2&#45;&gt;3 -->\n",
"<g id=\"edge9\" class=\"edge\">\n",
"<title>2&#45;&gt;3</title>\n",
"<path fill=\"none\" stroke=\"black\" d=\"M266.13,-70.23C280.64,-70.86 301.9,-70.83 320,-67 324.42,-66.06 328.97,-64.65 333.34,-63.04\"/>\n",
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"<path fill=\"none\" stroke=\"black\" d=\"M263.96,-61.25C270.02,-57.99 277.19,-54.48 284,-52 299.17,-46.48 316.74,-42.38 331.06,-39.59\"/>\n",
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"</g>\n",
"<!-- 2&#45;&gt;4 -->\n",
"<g id=\"edge10\" class=\"edge\">\n",
"<title>2&#45;&gt;4</title>\n",
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"</g>\n",
"<!-- 3&#45;&gt;0 -->\n",
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"<title>3&#45;&gt;0</title>\n",
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"</g>\n",
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"</g>\n",
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"<title>4&#45;&gt;4</title>\n",
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"</g>\n",
"</g>\n",
"</svg>\n"
],
"text/plain": [
"<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f37382dfa80> >"
"<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f5bd4905ae0> >"
]
},
"metadata": {},
@ -2528,7 +2493,7 @@
"</svg>\n"
],
"text/plain": [
"<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f37382df1b0> >"
"<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f5bd4905720> >"
]
},
"execution_count": 19,
@ -2604,7 +2569,7 @@
"</svg>\n"
],
"text/plain": [
"<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f37382dfae0> >"
"<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f5bd4905a80> >"
]
},
"execution_count": 20,
@ -3154,7 +3119,7 @@
"</svg>\n"
],
"text/plain": [
"<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f37382dfe10> >"
"<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f5bd49055d0> >"
]
},
"metadata": {},
@ -3254,7 +3219,7 @@
"</svg>\n"
],
"text/plain": [
"<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f37382c0e10> >"
"<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f5bd4905ed0> >"
]
},
"execution_count": 24,
@ -3327,7 +3292,7 @@
"</svg>\n"
],
"text/plain": [
"<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f37382dfba0> >"
"<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f5bd4905420> >"
]
},
"execution_count": 25,
@ -3498,7 +3463,7 @@
"</svg>\n"
],
"text/plain": [
"<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f37382dfc00> >"
"<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f5bd494e990> >"
]
},
"execution_count": 27,
@ -3581,7 +3546,7 @@
"</svg>\n"
],
"text/plain": [
"<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f37382dfe10> >"
"<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f5bd49055d0> >"
]
},
"metadata": {},
@ -3646,7 +3611,7 @@
"</svg>\n"
],
"text/plain": [
"<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f37382dfe10> >"
"<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f5bd49055d0> >"
]
},
"metadata": {},
@ -3733,7 +3698,7 @@
"</svg>\n"
],
"text/plain": [
"<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f37382dfe10> >"
"<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f5bd49055d0> >"
]
},
"execution_count": 29,
@ -3766,7 +3731,7 @@
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython3",
"version": "3.8.4"
"version": "3.8.5"
}
},
"nbformat": 4,

2
tests/python/remfin.py
View file

@ -92,4 +92,4 @@ State: 2
""")
b = spot.remove_fin(a)
size = (b.num_states(), b.num_edges())
assert size == (5, 17);
assert size == (5, 15);

7
tests/sanity/style.test
View file

@ -1,6 +1,6 @@
#! /bin/sh
# -*- coding: utf-8 -*-
# Copyright (C) 2009-2019 Laboratoire de Recherche et Développement de
# Copyright (C) 2009-2020 Laboratoire de Recherche et Développement de
# l'Epita (LRDE).
# Copyright (C) 2004, 2005 Laboratoire d'Informatique de Paris 6
# (LIP6), département Systèmes Répartis Coopératifs (SRC), Université
@ -158,7 +158,10 @@ for dir in "$TOP/spot" "$TOP/bin" "$TOP/tests"; do
$GREP '[ ]if ([^()]*).*{' $tmp &&
diag 'Opening { should be on its own line.'
$GREP '[ ]if (.*).*;' $tmp &&
$GREP '[ ]if ([^()]*).*;' $tmp &&
diag 'if body should be on another line.'
$GREP '[ ]if ([^()]*([^()]*)[^()]*).*;' $tmp &&
diag 'if body should be on another line.'
$GREP '[ ]else.*;' $tmp &&