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GCC Code Coverage Report

Directory:	.		Exec	Total	Coverage
File:	src/theory/quantifiers/sygus/sygus_pbe.cpp	Lines:	122	123	99.2 %
Date:	2021-09-07	Branches:	224	512	43.8 %


/******************************************************************************
 * Top contributors (to current version):
 *   Andrew Reynolds, Haniel Barbosa, Aina Niemetz
 *
 * This file is part of the cvc5 project.
 *
 * Copyright (c) 2009-2021 by the authors listed in the file AUTHORS
 * in the top-level source directory and their institutional affiliations.
 * All rights reserved.  See the file COPYING in the top-level source
 * directory for licensing information.
 * ****************************************************************************
 *
 * Utility for processing programming by examples synthesis conjectures.
 */
#include "theory/quantifiers/sygus/sygus_pbe.h"

#include "options/quantifiers_options.h"
#include "theory/datatypes/sygus_datatype_utils.h"
#include "theory/quantifiers/sygus/example_infer.h"
#include "theory/quantifiers/sygus/sygus_unif_io.h"
#include "theory/quantifiers/sygus/synth_conjecture.h"
#include "theory/quantifiers/sygus/term_database_sygus.h"
#include "theory/quantifiers/term_util.h"
#include "util/random.h"

using namespace cvc5;
using namespace cvc5::kind;

namespace cvc5 {
namespace theory {
namespace quantifiers {

SygusPbe::SygusPbe(QuantifiersState& qs,
                   QuantifiersInferenceManager& qim,
                   TermDbSygus* tds,
                   SynthConjecture* p)
    : SygusModule(qs, qim, tds, p)
{
  d_true = NodeManager::currentNM()->mkConst(true);
  d_false = NodeManager::currentNM()->mkConst(false);
  d_is_pbe = false;
}

SygusPbe::~SygusPbe() {}

bool SygusPbe::initialize(Node conj,
                          Node n,
                          const std::vector<Node>& candidates)
{
  Trace("sygus-pbe") << "Initialize PBE : " << n << std::endl;
  NodeManager* nm = NodeManager::currentNM();

  if (!options::sygusUnifPbe())
  {
    // we are not doing unification
    return false;
  }

  // check if all candidates are valid examples
  ExampleInfer* ei = d_parent->getExampleInfer();
  d_is_pbe = true;
  for (const Node& c : candidates)
  {
    // if it has no examples or the output of the examples is invalid
    if (ei->getNumExamples(c) == 0 || !ei->hasExamplesOut(c))
    {
      d_is_pbe = false;
      return false;
    }
  }
  for (const Node& c : candidates)
  {
    Assert(ei->hasExamples(c));
    d_sygus_unif[c].reset(new SygusUnifIo(d_parent));
    Trace("sygus-pbe") << "Initialize unif utility for " << c << "..."
                       << std::endl;
    std::map<Node, std::vector<Node>> strategy_lemmas;
    d_sygus_unif[c]->initializeCandidate(
        d_tds, c, d_candidate_to_enum[c], strategy_lemmas);
    Assert(!d_candidate_to_enum[c].empty());
    Trace("sygus-pbe") << "Initialize " << d_candidate_to_enum[c].size()
                       << " enumerators for " << c << "..." << std::endl;
    // collect list per type of strategy points with strategy lemmas
    std::map<TypeNode, std::vector<Node>> tn_to_strategy_pt;
    for (const std::pair<const Node, std::vector<Node>>& p : strategy_lemmas)
    {
      TypeNode tnsp = p.first.getType();
      tn_to_strategy_pt[tnsp].push_back(p.first);
    }
    // initialize the enumerators
    for (const Node& e : d_candidate_to_enum[c])
    {
      TypeNode etn = e.getType();
      d_tds->registerEnumerator(e, c, d_parent, ROLE_ENUM_POOL);
      d_enum_to_candidate[e] = c;
      TNode te = e;
      // initialize static symmetry breaking lemmas for it
      // we register only one "master" enumerator per type
      // thus, the strategy lemmas (which are for individual strategy points)
      // are applicable (disjunctively) to the master enumerator
      std::map<TypeNode, std::vector<Node>>::iterator itt =
          tn_to_strategy_pt.find(etn);
      if (itt != tn_to_strategy_pt.end())
      {
        std::vector<Node> disj;
        for (const Node& sp : itt->second)
        {
          std::map<Node, std::vector<Node>>::iterator itsl =
              strategy_lemmas.find(sp);
          Assert(itsl != strategy_lemmas.end());
          if (!itsl->second.empty())
          {
            TNode tsp = sp;
            Node lem = itsl->second.size() == 1 ? itsl->second[0]
                                                : nm->mkNode(AND, itsl->second);
            if (tsp != te)
            {
              lem = lem.substitute(tsp, te);
            }
            if (std::find(disj.begin(), disj.end(), lem) == disj.end())
            {
              disj.push_back(lem);
            }
          }
        }
        // add its active guard
        Node ag = d_tds->getActiveGuardForEnumerator(e);
        Assert(!ag.isNull());
        disj.push_back(ag.negate());
        Node lem = disj.size() == 1 ? disj[0] : nm->mkNode(OR, disj);
        // Apply extended rewriting on the lemma. This helps utilities like
        // SygusEnumerator more easily recognize the shape of this lemma, e.g.
        // ( ~is-ite(x) or ( ~is-ite(x) ^ P ) ) --> ~is-ite(x).
        lem = d_tds->getExtRewriter()->extendedRewrite(lem);
        Trace("sygus-pbe") << "  static redundant op lemma : " << lem
                           << std::endl;
        // Register as a symmetry breaking lemma with the term database.
        // This will either be processed via a lemma on the output channel
        // of the sygus extension of the datatypes solver, or internally
        // encoded as a constraint to an active enumerator.
        d_tds->registerSymBreakLemma(e, lem, etn, 0, false);
      }
    }
  }
  return true;
}

// ------------------------------------------- solution construction from enumeration

void SygusPbe::getTermList(const std::vector<Node>& candidates,
                           std::vector<Node>& terms)
{
  for( unsigned i=0; i<candidates.size(); i++ ){
    Node v = candidates[i];
    std::map<Node, std::vector<Node> >::iterator it =
        d_candidate_to_enum.find(v);
    if (it != d_candidate_to_enum.end())
    {
      terms.insert(terms.end(), it->second.begin(), it->second.end());
    }
  }
}

bool SygusPbe::allowPartialModel() { return !options::sygusPbeMultiFair(); }

bool SygusPbe::constructCandidates(const std::vector<Node>& enums,
                                   const std::vector<Node>& enum_values,
                                   const std::vector<Node>& candidates,
                                   std::vector<Node>& candidate_values)
{
  Assert(enums.size() == enum_values.size());
  if( !enums.empty() ){
    unsigned min_term_size = 0;
    Trace("sygus-pbe-enum") << "Register new enumerated values : " << std::endl;
    std::vector<unsigned> szs;
    for (unsigned i = 0, esize = enums.size(); i < esize; i++)
    {
      Trace("sygus-pbe-enum") << "  " << enums[i] << " -> ";
      TermDbSygus::toStreamSygus("sygus-pbe-enum", enum_values[i]);
      Trace("sygus-pbe-enum") << std::endl;
      if (!enum_values[i].isNull())
      {
        unsigned sz = datatypes::utils::getSygusTermSize(enum_values[i]);
        szs.push_back(sz);
        if (i == 0 || sz < min_term_size)
        {
          min_term_size = sz;
        }
      }
      else
      {
        szs.push_back(0);
      }
    }
    // Assume two enumerators of types T1 and T2.
    // If options::sygusPbeMultiFair() is true,
    // we ensure that all values of type T1 and size n are enumerated before
    // any term of type T2 of size n+d, and vice versa, where d is
    // set by options::sygusPbeMultiFairDiff(). If d is zero, then our
    // enumeration is such that all terms of T1 or T2 of size n are considered
    // before any term of size n+1.
    int diffAllow = options::sygusPbeMultiFairDiff();
    std::vector<unsigned> enum_consider;
    for (unsigned i = 0, esize = enums.size(); i < esize; i++)
    {
      if (!enum_values[i].isNull())
      {
        Assert(szs[i] >= min_term_size);
        int diff = szs[i] - min_term_size;
        if (!options::sygusPbeMultiFair() || diff <= diffAllow)
        {
          enum_consider.push_back(i);
        }
      }
    }

    // only consider the enumerators that are at minimum size (for fairness)
    Trace("sygus-pbe-enum") << "...register " << enum_consider.size() << " / " << enums.size() << std::endl;
    NodeManager* nm = NodeManager::currentNM();
    for (unsigned i = 0, ecsize = enum_consider.size(); i < ecsize; i++)
    {
      unsigned j = enum_consider[i];
      Node e = enums[j];
      Node v = enum_values[j];
      Assert(d_enum_to_candidate.find(e) != d_enum_to_candidate.end());
      Node c = d_enum_to_candidate[e];
      std::vector<Node> enum_lems;
      d_sygus_unif[c]->notifyEnumeration(e, v, enum_lems);
      if (!enum_lems.empty())
      {
        // the lemmas must be guarded by the active guard of the enumerator
        Node g = d_tds->getActiveGuardForEnumerator(e);
        Assert(!g.isNull());
        for (unsigned k = 0, size = enum_lems.size(); k < size; k++)
        {
          Node lem = nm->mkNode(OR, g.negate(), enum_lems[k]);
          d_qim.addPendingLemma(lem,
                                InferenceId::QUANTIFIERS_SYGUS_PBE_EXCLUDE);
        }
      }
    }
  }
  for( unsigned i=0; i<candidates.size(); i++ ){
    Node c = candidates[i];
    //build decision tree for candidate
    std::vector<Node> sol;
    std::vector<Node> lems;
    bool solSuccess = d_sygus_unif[c]->constructSolution(sol, lems);
    for (const Node& lem : lems)
    {
      d_qim.addPendingLemma(lem,
                            InferenceId::QUANTIFIERS_SYGUS_PBE_CONSTRUCT_SOL);
    }
    if (solSuccess)
    {
      Assert(sol.size() == 1);
      candidate_values.push_back(sol[0]);
    }
    else
    {
      return false;
    }
  }
  return true;
}

}
}
}  // namespace cvc5


Generated by: GCOVR (Version 3.2)

Line	Exec	Source
1		/******************************************************************************
2		* Top contributors (to current version):
3		* Andrew Reynolds, Haniel Barbosa, Aina Niemetz
4		*
5		* This file is part of the cvc5 project.
6		*
7		* Copyright (c) 2009-2021 by the authors listed in the file AUTHORS
8		* in the top-level source directory and their institutional affiliations.
9		* All rights reserved. See the file COPYING in the top-level source
10		* directory for licensing information.
11		* ****************************************************************************
12		*
13		* Utility for processing programming by examples synthesis conjectures.
14		*/
15		#include "theory/quantifiers/sygus/sygus_pbe.h"
16
17		#include "options/quantifiers_options.h"
18		#include "theory/datatypes/sygus_datatype_utils.h"
19		#include "theory/quantifiers/sygus/example_infer.h"
20		#include "theory/quantifiers/sygus/sygus_unif_io.h"
21		#include "theory/quantifiers/sygus/synth_conjecture.h"
22		#include "theory/quantifiers/sygus/term_database_sygus.h"
23		#include "theory/quantifiers/term_util.h"
24		#include "util/random.h"
25
26		using namespace cvc5;
27		using namespace cvc5::kind;
28
29		namespace cvc5 {
30		namespace theory {
31		namespace quantifiers {
32
33	1191	SygusPbe::SygusPbe(QuantifiersState& qs,
34		QuantifiersInferenceManager& qim,
35		TermDbSygus* tds,
36	1191	SynthConjecture* p)
37	1191	: SygusModule(qs, qim, tds, p)
38		{
39	1191	d_true = NodeManager::currentNM()->mkConst(true);
40	1191	d_false = NodeManager::currentNM()->mkConst(false);
41	1191	d_is_pbe = false;
42	1191	}
43
44	2378	SygusPbe::~SygusPbe() {}
45
46	241	bool SygusPbe::initialize(Node conj,
47		Node n,
48		const std::vector<Node>& candidates)
49		{
50	241	Trace("sygus-pbe") << "Initialize PBE : " << n << std::endl;
51	241	NodeManager* nm = NodeManager::currentNM();
52
53	241	if (!options::sygusUnifPbe())
54		{
55		// we are not doing unification
56	31	return false;
57		}
58
59		// check if all candidates are valid examples
60	210	ExampleInfer* ei = d_parent->getExampleInfer();
61	210	d_is_pbe = true;
62	257	for (const Node& c : candidates)
63		{
64		// if it has no examples or the output of the examples is invalid
65	213	if (ei->getNumExamples(c) == 0 \|\| !ei->hasExamplesOut(c))
66		{
67	166	d_is_pbe = false;
68	166	return false;
69		}
70		}
71	91	for (const Node& c : candidates)
72		{
73	47	Assert(ei->hasExamples(c));
74	47	d_sygus_unif[c].reset(new SygusUnifIo(d_parent));
75	94	Trace("sygus-pbe") << "Initialize unif utility for " << c << "..."
76	47	<< std::endl;
77	94	std::map<Node, std::vector<Node>> strategy_lemmas;
78	94	d_sygus_unif[c]->initializeCandidate(
79	47	d_tds, c, d_candidate_to_enum[c], strategy_lemmas);
80	47	Assert(!d_candidate_to_enum[c].empty());
81	94	Trace("sygus-pbe") << "Initialize " << d_candidate_to_enum[c].size()
82	47	<< " enumerators for " << c << "..." << std::endl;
83		// collect list per type of strategy points with strategy lemmas
84	94	std::map<TypeNode, std::vector<Node>> tn_to_strategy_pt;
85	101	for (const std::pair<const Node, std::vector<Node>>& p : strategy_lemmas)
86		{
87	108	TypeNode tnsp = p.first.getType();
88	54	tn_to_strategy_pt[tnsp].push_back(p.first);
89		}
90		// initialize the enumerators
91	110	for (const Node& e : d_candidate_to_enum[c])
92		{
93	126	TypeNode etn = e.getType();
94	63	d_tds->registerEnumerator(e, c, d_parent, ROLE_ENUM_POOL);
95	63	d_enum_to_candidate[e] = c;
96	126	TNode te = e;
97		// initialize static symmetry breaking lemmas for it
98		// we register only one "master" enumerator per type
99		// thus, the strategy lemmas (which are for individual strategy points)
100		// are applicable (disjunctively) to the master enumerator
101		std::map<TypeNode, std::vector<Node>>::iterator itt =
102	63	tn_to_strategy_pt.find(etn);
103	63	if (itt != tn_to_strategy_pt.end())
104		{
105	72	std::vector<Node> disj;
106	88	for (const Node& sp : itt->second)
107		{
108		std::map<Node, std::vector<Node>>::iterator itsl =
109	52	strategy_lemmas.find(sp);
110	52	Assert(itsl != strategy_lemmas.end());
111	52	if (!itsl->second.empty())
112		{
113	104	TNode tsp = sp;
114	98	Node lem = itsl->second.size() == 1 ? itsl->second[0]
115	150	: nm->mkNode(AND, itsl->second);
116	52	if (tsp != te)
117		{
118	16	lem = lem.substitute(tsp, te);
119		}
120	52	if (std::find(disj.begin(), disj.end(), lem) == disj.end())
121		{
122	38	disj.push_back(lem);
123		}
124		}
125		}
126		// add its active guard
127	72	Node ag = d_tds->getActiveGuardForEnumerator(e);
128	36	Assert(!ag.isNull());
129	36	disj.push_back(ag.negate());
130	72	Node lem = disj.size() == 1 ? disj[0] : nm->mkNode(OR, disj);
131		// Apply extended rewriting on the lemma. This helps utilities like
132		// SygusEnumerator more easily recognize the shape of this lemma, e.g.
133		// ( ~is-ite(x) or ( ~is-ite(x) ^ P ) ) --> ~is-ite(x).
134	36	lem = d_tds->getExtRewriter()->extendedRewrite(lem);
135	72	Trace("sygus-pbe") << " static redundant op lemma : " << lem
136	36	<< std::endl;
137		// Register as a symmetry breaking lemma with the term database.
138		// This will either be processed via a lemma on the output channel
139		// of the sygus extension of the datatypes solver, or internally
140		// encoded as a constraint to an active enumerator.
141	36	d_tds->registerSymBreakLemma(e, lem, etn, 0, false);
142		}
143		}
144		}
145	44	return true;
146		}
147
148		// ------------------------------------------- solution construction from enumeration
149
150	3744	void SygusPbe::getTermList(const std::vector<Node>& candidates,
151		std::vector<Node>& terms)
152		{
153	7582	for( unsigned i=0; i<candidates.size(); i++ ){
154	7676	Node v = candidates[i];
155		std::map<Node, std::vector<Node> >::iterator it =
156	3838	d_candidate_to_enum.find(v);
157	3838	if (it != d_candidate_to_enum.end())
158		{
159	3838	terms.insert(terms.end(), it->second.begin(), it->second.end());
160		}
161		}
162	3744	}
163
164	3744	bool SygusPbe::allowPartialModel() { return !options::sygusPbeMultiFair(); }
165
166	518	bool SygusPbe::constructCandidates(const std::vector<Node>& enums,
167		const std::vector<Node>& enum_values,
168		const std::vector<Node>& candidates,
169		std::vector<Node>& candidate_values)
170		{
171	518	Assert(enums.size() == enum_values.size());
172	518	if( !enums.empty() ){
173	518	unsigned min_term_size = 0;
174	518	Trace("sygus-pbe-enum") << "Register new enumerated values : " << std::endl;
175	1036	std::vector<unsigned> szs;
176	1246	for (unsigned i = 0, esize = enums.size(); i < esize; i++)
177		{
178	728	Trace("sygus-pbe-enum") << " " << enums[i] << " -> ";
179	728	TermDbSygus::toStreamSygus("sygus-pbe-enum", enum_values[i]);
180	728	Trace("sygus-pbe-enum") << std::endl;
181	728	if (!enum_values[i].isNull())
182		{
183	584	unsigned sz = datatypes::utils::getSygusTermSize(enum_values[i]);
184	584	szs.push_back(sz);
185	584	if (i == 0 \|\| sz < min_term_size)
186		{
187	487	min_term_size = sz;
188		}
189		}
190		else
191		{
192	144	szs.push_back(0);
193		}
194		}
195		// Assume two enumerators of types T1 and T2.
196		// If options::sygusPbeMultiFair() is true,
197		// we ensure that all values of type T1 and size n are enumerated before
198		// any term of type T2 of size n+d, and vice versa, where d is
199		// set by options::sygusPbeMultiFairDiff(). If d is zero, then our
200		// enumeration is such that all terms of T1 or T2 of size n are considered
201		// before any term of size n+1.
202	518	int diffAllow = options::sygusPbeMultiFairDiff();
203	1036	std::vector<unsigned> enum_consider;
204	1246	for (unsigned i = 0, esize = enums.size(); i < esize; i++)
205		{
206	728	if (!enum_values[i].isNull())
207		{
208	584	Assert(szs[i] >= min_term_size);
209	584	int diff = szs[i] - min_term_size;
210	584	if (!options::sygusPbeMultiFair() \|\| diff <= diffAllow)
211		{
212	584	enum_consider.push_back(i);
213		}
214		}
215		}
216
217		// only consider the enumerators that are at minimum size (for fairness)
218	518	Trace("sygus-pbe-enum") << "...register " << enum_consider.size() << " / " << enums.size() << std::endl;
219	518	NodeManager* nm = NodeManager::currentNM();
220	1102	for (unsigned i = 0, ecsize = enum_consider.size(); i < ecsize; i++)
221		{
222	584	unsigned j = enum_consider[i];
223	1168	Node e = enums[j];
224	1168	Node v = enum_values[j];
225	584	Assert(d_enum_to_candidate.find(e) != d_enum_to_candidate.end());
226	1168	Node c = d_enum_to_candidate[e];
227	1168	std::vector<Node> enum_lems;
228	584	d_sygus_unif[c]->notifyEnumeration(e, v, enum_lems);
229	584	if (!enum_lems.empty())
230		{
231		// the lemmas must be guarded by the active guard of the enumerator
232	14	Node g = d_tds->getActiveGuardForEnumerator(e);
233	7	Assert(!g.isNull());
234	14	for (unsigned k = 0, size = enum_lems.size(); k < size; k++)
235		{
236	14	Node lem = nm->mkNode(OR, g.negate(), enum_lems[k]);
237	7	d_qim.addPendingLemma(lem,
238		InferenceId::QUANTIFIERS_SYGUS_PBE_EXCLUDE);
239		}
240		}
241		}
242		}
243	569	for( unsigned i=0; i<candidates.size(); i++ ){
244	577	Node c = candidates[i];
245		//build decision tree for candidate
246	577	std::vector<Node> sol;
247	577	std::vector<Node> lems;
248	526	bool solSuccess = d_sygus_unif[c]->constructSolution(sol, lems);
249	526	for (const Node& lem : lems)
250		{
251		d_qim.addPendingLemma(lem,
252		InferenceId::QUANTIFIERS_SYGUS_PBE_CONSTRUCT_SOL);
253		}
254	526	if (solSuccess)
255		{
256	51	Assert(sol.size() == 1);
257	51	candidate_values.push_back(sol[0]);
258		}
259		else
260		{
261	475	return false;
262		}
263		}
264	43	return true;
265		}
266
267		}
268		}
269	29502	} // namespace cvc5