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spot/tests/python/decompose.ipynb
Alexandre Duret-Lutz 6cec43294d dot: name the digraph 
* spot/twaalgos/dot.cc: Here.
* NEWS: Mention the change.
* tests/core/alternating.test, tests/core/det.test,
tests/core/dstar.test, tests/core/monitor.test,
tests/core/neverclaimread.test, tests/core/readsave.test,
tests/core/sccdot.test, tests/core/tgbagraph.test,
tests/python/_altscc.ipynb, tests/python/_autparserr.ipynb,
tests/python/alternation.ipynb, tests/python/atva16-fig2a.ipynb,
tests/python/atva16-fig2b.ipynb, tests/python/automata-io.ipynb,
tests/python/automata.ipynb, tests/python/decompose.ipynb,
tests/python/gen.ipynb, tests/python/highlighting.ipynb,
tests/python/ltsmin-dve.ipynb, tests/python/ltsmin-pml.ipynb,
tests/python/parity.ipynb, tests/python/product.ipynb,
tests/python/randaut.ipynb, tests/python/satmin.ipynb,
tests/python/stutter-inv.ipynb, tests/python/testingaut.ipynb,
tests/python/word.ipynb: Adjust test cases.
2018-04-07 18:58:58 +02:00

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Raw Blame History

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"from IPython.display import display\n",
"import spot\n",
"spot.setup(show_default='.bans')"
]
},
{
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"source": [
"This notebook demonstrates how to use the `decompose_scc()` function to split an automaton in up to three automata capturing different behaviors. This is based on the paper [Strength-based decomposition of the property Büchi automaton for faster model checking](https://www.lrde.epita.fr/~adl/dl/adl/renault.13.tacas.pdf) (TACAS'13).\n",
"\n",
"This page uses the Python bindings, but the same decompositions can be performed from the shell using [`autfilt`](https://spot.lrde.epita.fr/autfilt.html) and its `--decompose-scc` option.\n",
"\n",
"# Basics\n",
"\n",
"Let's define the following strengths of accepting SCCs:\n",
"\n",
"- an accepting SCC is **inherently weak** if it does not contain any rejecting cycle\n",
"- an accepting SCC is **inherently terminal** if it is *inherently weak* and complete (i.e. from any state, you can stay in the SCC by reading any word)\n",
"- an accepting SCC is **strictly inherently weak** if it is *inherently weak* and not complete (in other words: *weak* but not *terminal*)\n",
"- an accepting SCC is **strong** if it is not inherently weak.\n",
"\n",
"The strengths **strong**, **stricly inherently weak**, and **inherently terminal** define a partition of all accepting SCCs. The following Büchi automaton has 4 SCCs, and its 3 accepting SCCs show an example of each strength.\n",
"\n",
"Note: the reason we use the word *inherently* is that the *weak* and *terminal* properties are usually defined syntactically: an accepting SCC would be weak if all its transitions belong to the same acceptance sets. This syntactic criterion is a sufficient condition for an accepting SCC to not have any rejecting cycle, but it is not necessary. Hence a *weak* SCC is *inherently weak*; but while an *inherently weak* SCC is not necessarily *weak*, it can be modified to be *weak* without alterning the langage."
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"The `decompose_strength()` function takes an automaton, and a string specifying which strength to preserve. \n",
"\n",
"The letters used for this specification are as follows:\n",
"\n",
"- `t`: (inherently) terminal\n",
"- `w`: (strictly inherently) weak\n",
"- `s`: strong\n",
"\n",
"For instance if we want to preserve only the **strictly inherently weak** part of this automaton, we should get only the SCC with the self-loop on $b$, and the SCC above it so that we can reach it. However the SCC above is not stricly weak, so it should not accept any word in the new automaton."
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"\n",
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"text/plain": [
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],
"source": [
"for opt in ('sw', 'st', 'wt'):\n",
" a = spot.decompose_scc(aut, opt)\n",
" a.set_name(\"option: \" + opt)\n",
" display(a)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"# Generalized acceptance\n",
"\n",
"There is nothing that prevents the above decomposition to work with other types of acceptance.\n",
"\n",
"## Rabin\n",
"\n",
"The following Rabin automaton was generated with\n",
"\n",
" ltldo -f '(Ga -> Gb) W c' 'ltl2dstar --ltl2nba=spin:ltl2tgba@-Ds' -H | autfilt -H --merge-transitions\n",
" \n",
"(The `autfilt -H --merge-transitions` pass is just here to reduce the size of the file and make the automaton more readable.)"
]
},
{
"cell_type": "code",
"execution_count": 8,
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"text/plain": [
"<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f6b42f7a780> >"
]
},
"execution_count": 8,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"aut = spot.automaton(\"\"\"\n",
"HOA: v1\n",
"States: 9\n",
"Start: 2\n",
"AP: 3 \"a\" \"b\" \"c\"\n",
"acc-name: Rabin 2\n",
"Acceptance: 4 (Fin(0) & Inf(1)) | (Fin(2) & Inf(3))\n",
"properties: trans-labels explicit-labels state-acc complete\n",
"properties: deterministic\n",
"--BODY--\n",
"State: 0 {2}\n",
"[0&!2] 0\n",
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"[!0&!2] 5\n",
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"State: 2 {2}\n",
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"[2] 6\n",
"State: 3 {1 2}\n",
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"[t] 6\n",
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"[0&1&2] 8\n",
"State: 8 {3}\n",
"[0&!1] 1\n",
"[!0] 6\n",
"[0&1] 8\n",
"--END--\n",
"\"\"\")\n",
"aut"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"Let's decompose it into three strengths:"
]
},
{
"cell_type": "code",
"execution_count": 9,
"metadata": {},
"outputs": [
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"for (name, opt) in (('terminal', 't'), ('strictly weak', 'w'), ('strong', 's')):\n",
" a = spot.decompose_scc(aut, opt)\n",
" a.set_name(name)\n",
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{
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"source": [
"Note how the two weak automata (i.e., stricly weak and terminal) are now using a Büchi acceptance condition (because that is sufficient for weak automata) while the strong automaton inherited the original acceptance condition.\n",
"\n",
"When extracting multiple strengths and one of the strength is **strong**, we preserve the original acceptance. For instance extracting **strong** and **inherently terminal** gives the following automaton, where only **stricly inherently weak** SCCs have become rejecting."
]
},
{
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{
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"source": [
"The weak automata seem to be good candidates for further simplification. Let's add a call to `postprocess()` to out decomposition loop, trying to preserve the determinism and state-based acceptance of the original automaton."
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},
{
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],
"source": [
"for (name, opt) in (('inherently terminal', 't'), ('strictly inherently weak', 'w'), ('strong', 's')):\n",
" a = spot.decompose_scc(aut, opt).postprocess('deterministic', 'SBAcc')\n",
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]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Streett\n",
"\n",
"Since this notebook also serves as a test suite, let's try a Streett automaton. This one was generated with\n",
"\n",
" ltldo -f '(Ga -> Gb) W c' 'ltl2dstar --automata=streett --ltl2nba=spin:ltl2tgba@-Ds' -H | \n",
" autfilt -H --merge-transitions"
]
},
{
"cell_type": "code",
"execution_count": 12,
"metadata": {},
"outputs": [
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"text/plain": [
"<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f6b42f7a720> >"
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"source": [
"aut = spot.automaton(\"\"\"\n",
"HOA: v1\n",
"States: 8\n",
"Start: 7\n",
"AP: 3 \"a\" \"b\" \"c\"\n",
"acc-name: Streett 2\n",
"Acceptance: 4 (Fin(0) | Inf(1)) & (Fin(2) | Inf(3))\n",
"properties: trans-labels explicit-labels state-acc complete\n",
"properties: deterministic\n",
"--BODY--\n",
"State: 0 {2}\n",
"[0&1] 0\n",
"[0&!1] 3\n",
"[!0] 4\n",
"State: 1 {2}\n",
"[0&1&2] 0\n",
"[0&1&!2] 1\n",
"[0&!1&!2] 2\n",
"[0&!1&2] 3\n",
"[!0&2] 4\n",
"[!0&!2] 7\n",
"State: 2 {2}\n",
"[0&1&!2] 1\n",
"[0&!1&!2] 2\n",
"[0&2] 3\n",
"[!0&2] 4\n",
"[!0&!2] 7\n",
"State: 3 {0 3}\n",
"[0] 3\n",
"[!0] 4\n",
"State: 4 {1 3}\n",
"[t] 4\n",
"State: 5 {3}\n",
"[0&!1] 3\n",
"[!0] 4\n",
"[0&1] 5\n",
"State: 6 {3}\n",
"[0&!1&!2] 2\n",
"[0&!1&2] 3\n",
"[!0&2] 4\n",
"[0&1&2] 5\n",
"[0&1&!2] 6\n",
"[!0&!2] 7\n",
"State: 7 {3}\n",
"[0&!1&!2] 2\n",
"[2] 4\n",
"[0&1&!2] 6\n",
"[!0&!2] 7\n",
"--END--\n",
"\"\"\")\n",
"aut"
]
},
{
"cell_type": "code",
"execution_count": 13,
"metadata": {},
"outputs": [
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"source": [
"for (name, opt) in (('inherently terminal', 't'), ('strictly inherently weak', 'w'), ('strong', 's')):\n",
" a = spot.decompose_strength(aut, opt)\n",
" a.set_name(name)\n",
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"source": [
"The subtlety of Streett acceptance is that if a path that does not visit any accepting set infinitely often *is* accepting. So when disabling SCCs, we must be careful to label them with a combination of rejecting acceptance sets.\n",
"\n",
"This is easy to understand using an example. In the following extraction of the **strong** and **inherently terminal** parts, the rejecting SCCs (that were either rejecting or strictly inherently weak originally) have been labeled by the same acceptance sets, to ensure that they are rejected."
]
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"## Corner cases\n",
"\n",
"When the acceptance condition is always satisfiable, all non-trivial SCCs are accepting, and inherently weak.\n",
"\n",
"This include acceptances like `Acceptance: 0 t`, but also trickier ones like `Acceptance: 1 Inf(0) | Fin(0)` that you can make as complex as you fancy.\n",
"\n",
"### `Acceptance: 0 t`\n",
"\n",
"This occur frequently whant translating LTL formulas that are safety properties:"
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"source": [
"# There is no strong part for this automaton\n",
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"Note that the above is exactly the output of `decompose_strength(aut, 't')`. The `'s'` flag was actively ignored. If `'s'` had not been ignored an the automaton processed as if its strong part had to be preserved, the original acceptance conditions would have been used, and this would have prevented the disabling of the initial SCC."
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"### `Acceptance: 1 Inf(0) | Fin(0)`\n",
"\n",
"This acceptance could be replaced by `Acceptance: 0 t` without altering the language of the automaton. However its use of acceptance sets allows us to define some automata with SCCs that are *inherently weak* but not *weak*."
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"text/plain": [
"<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f6b42f2c120> >"
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"source": [
"for (name, opt) in (('terminal', 't'), ('strictly weak', 'w'), ('strong', 's'), ('all strengths', 'swt')):\n",
" a = spot.decompose_scc(aut, opt)\n",
" if a:\n",
" a.set_name(name)\n",
" display(a)\n",
" else:\n",
" print(\"no output for \" + name)"
]
},
{
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"metadata": {},
"source": [
"# `decompose_scc()` by SCC number\n",
"\n",
"Decompose SCC can also be called by SCC numbers.\n",
"The example below show the different SCC numbers and the state they contains, before extracting the sub-automaton containing SCC 1 and 2 (i.e., anything leading to states 1 and 4 of the original automaton). This example also shows that when an `scc_info` is available for to automaton to decompose, it can be passed to `decompose_scc()` in lieu of the automaton: doing so is faster because `decompose_scc()` does not need to rebuild this object. "
]
},
{
"cell_type": "code",
"execution_count": 21,
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"SCC #0 containts states [1]\n",
"SCC #1 containts states [2]\n",
"SCC #2 containts states [4]\n",
"SCC #3 containts states [0, 3]\n"
]
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"source": [
"aut = spot.translate('(Ga -> Gb) W c')\n",
"si = spot.scc_info(aut)\n",
"for scc in range(si.scc_count()):\n",
" print(\"SCC #{} containts states {}\".format(scc, list(si.states_of(scc))))\n",
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]
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"If an SCC number N is prefixed by `a`, it signifies that we want to extract the Nth *accepting* SCC. In the above example SCC 2 is rejecting so SCC `a2` denotes SCC 3."
]
},
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