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/****************************************************************************** |
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* Top contributors (to current version): |
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* Andrew Reynolds, Aina Niemetz |
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* |
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* This file is part of the cvc5 project. |
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* |
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* Copyright (c) 2009-2021 by the authors listed in the file AUTHORS |
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* in the top-level source directory and their institutional affiliations. |
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* All rights reserved. See the file COPYING in the top-level source |
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* directory for licensing information. |
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* **************************************************************************** |
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* |
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* Utilities for filtering solutions. |
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*/ |
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#include "theory/quantifiers/solution_filter.h" |
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#include <fstream> |
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#include "options/base_options.h" |
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#include "options/quantifiers_options.h" |
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#include "util/random.h" |
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using namespace cvc5::kind; |
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namespace cvc5 { |
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namespace theory { |
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namespace quantifiers { |
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SolutionFilterStrength::SolutionFilterStrength(Env& env) |
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: ExprMiner(env), d_isStrong(true) |
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{ |
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} |
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void SolutionFilterStrength::initialize(const std::vector<Node>& vars, |
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SygusSampler* ss) |
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{ |
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ExprMiner::initialize(vars, ss); |
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} |
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void SolutionFilterStrength::setLogicallyStrong(bool isStrong) |
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{ |
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d_isStrong = isStrong; |
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} |
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bool SolutionFilterStrength::addTerm(Node n, std::ostream& out) |
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{ |
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if (!n.getType().isBoolean()) |
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{ |
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// currently, should not register non-Boolean terms here |
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Assert(false); |
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return true; |
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} |
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Node basen = d_isStrong ? n : n.negate(); |
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NodeManager* nm = NodeManager::currentNM(); |
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// Do i subsume the disjunction of all previous solutions? If so, we discard |
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// this immediately |
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Node curr; |
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if (!d_curr_sols.empty()) |
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{ |
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curr = d_curr_sols.size() == 1 |
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? d_curr_sols[0] |
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: nm->mkNode(d_isStrong ? OR : AND, d_curr_sols); |
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Node imp = nm->mkNode(AND, basen.negate(), curr); |
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Trace("sygus-sol-implied") |
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<< " implies: check subsumed (strong=" << d_isStrong << ") " << imp |
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<< "..." << std::endl; |
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// check the satisfiability query |
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Result r = doCheck(imp); |
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Trace("sygus-sol-implied") << " implies: ...got : " << r << std::endl; |
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if (r.asSatisfiabilityResult().isSat() == Result::UNSAT) |
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{ |
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// it is subsumed by the current, discard this |
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return false; |
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} |
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} |
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// check which solutions would have been filtered if the current had come |
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// first |
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if (options::sygusFilterSolRevSubsume()) |
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{ |
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std::vector<Node> nsubsume; |
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for (const Node& s : d_curr_sols) |
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{ |
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Node imp = nm->mkNode(AND, s.negate(), basen); |
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Trace("sygus-sol-implied") |
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<< " implies: check subsuming " << imp << "..." << std::endl; |
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// check the satisfiability query |
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Result r = doCheck(imp); |
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Trace("sygus-sol-implied") << " implies: ...got : " << r << std::endl; |
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if (r.asSatisfiabilityResult().isSat() != Result::UNSAT) |
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{ |
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nsubsume.push_back(s); |
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} |
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else |
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{ |
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const Options& opts = d_env.getOptions(); |
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std::ostream* smtOut = opts.base.out; |
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(*smtOut) << "; (filtered " << (d_isStrong ? s : s.negate()) << ")" |
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<< std::endl; |
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} |
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} |
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d_curr_sols.clear(); |
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d_curr_sols.insert(d_curr_sols.end(), nsubsume.begin(), nsubsume.end()); |
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} |
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d_curr_sols.push_back(basen); |
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return true; |
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} |
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} // namespace quantifiers |
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} // namespace theory |
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} // namespace cvc5 |