ItemTreePtr RuleIntroductionSolver::compute()
{
const auto nodeStackElement = app.getPrinter().visitNode(decomposition);
assert(decomposition.getChildren().size() == 1);
Decomposition& childNode = **decomposition.getChildren().begin();
ItemTreePtr childResult = childNode.getSolver().compute();
ItemTreePtr result;
if(childResult) {
result = extendRoot(childResult);
assert(childResult->getChildren().empty() == false);
for(const ItemTreePtr& childCandidate : childResult->getChildren()) {
// Make introducedAtom false
ItemTreeNode::Items candidateItems = childCandidate->getNode()->getItems();
ItemTreeNode::Items candidateAuxItems = childCandidate->getNode()->getAuxItems();
// Calculate false atoms of this candidate
Hypergraph::Vertices candidateFalseAtoms;
std::set_symmetric_difference(decomposition.getNode().getBag().begin(), decomposition.getNode().getBag().end(), candidateItems.begin(), candidateItems.end(), std::inserter(candidateFalseAtoms, candidateFalseAtoms.begin()));
const bool introducedRuleDisappears = doesIntroducedRuleDisappear(candidateItems);
if(introducedRuleDisappears || isIntroducedRuleSatisfied(candidateItems, candidateFalseAtoms))
candidateAuxItems.insert(introducedRule);
ItemTreePtr candidate = extendCandidate(std::move(candidateItems), std::move(candidateAuxItems), childCandidate);
for(const ItemTreePtr& childCertificate : childCandidate->getChildren()) {
ItemTreeNode::Items certificateItems = childCertificate->getNode()->getItems();
ItemTreeNode::Items certificateAuxItems = childCertificate->getNode()->getAuxItems();
if(introducedRuleDisappears)
certificateAuxItems.insert(introducedRule);
else {
// Calculate false atoms of this certificate
Hypergraph::Vertices certificateFalseAtoms;
std::set_symmetric_difference(decomposition.getNode().getBag().begin(), decomposition.getNode().getBag().end(), certificateItems.begin(), certificateItems.end(), std::inserter(certificateFalseAtoms, certificateFalseAtoms.begin()));
if(isIntroducedRuleSatisfied(certificateItems, certificateFalseAtoms))
certificateAuxItems.insert(introducedRule);
}
candidate->addChildAndMerge(extendCertificate(std::move(certificateItems), std::move(certificateAuxItems), childCertificate));
}
result->addChildAndMerge(std::move(candidate));
}
assert(!decomposition.isRoot());
if(result->finalize(app, false, app.isPruningDisabled() == false || decomposition.isRoot()) == false)
result.reset();
}
app.getPrinter().solverInvocationResult(decomposition, result.get());
return result;
}
ItemTreePtr AtomRemovalSolver::compute()
{
const auto nodeStackElement = app.getPrinter().visitNode(decomposition);
assert(decomposition.getChildren().size() == 1);
Decomposition& childNode = **decomposition.getChildren().begin();
ItemTreePtr childResult = childNode.getSolver().compute();
ItemTreePtr result;
if(childResult) {
result = extendRoot(childResult);
assert(childResult->getChildren().empty() == false);
// Guess node to extend at depth 1
for(const ItemTreePtr& childCandidate : childResult->getChildren()) {
ItemTreeNode::Items candidateItems = childCandidate->getNode()->getItems();
candidateItems.erase(removedAtom);
ItemTreeNode::Items candidateAuxItems = childCandidate->getNode()->getAuxItems();
ItemTreePtr candidate = extendCandidate(std::move(candidateItems), std::move(candidateAuxItems), childCandidate);
for(const ItemTreePtr& childCertificate : childCandidate->getChildren()) {
ItemTreeNode::Items certificateItems = childCertificate->getNode()->getItems();
certificateItems.erase(removedAtom);
ItemTreeNode::Items certificateAuxItems = childCertificate->getNode()->getAuxItems();
const ItemTreeNode::Type type = decomposition.isRoot() ? (certificateAuxItems.find(String("smaller")) == certificateAuxItems.end() ? ItemTreeNode::Type::ACCEPT : ItemTreeNode::Type::REJECT) : ItemTreeNode::Type::UNDEFINED;
candidate->addChildAndMerge(extendCertificate(std::move(certificateItems), std::move(certificateAuxItems), childCertificate, type));
}
result->addChildAndMerge(std::move(candidate));
}
if(result->finalize(app, decomposition.isRoot(), app.isPruningDisabled() == false || decomposition.isRoot()) == false)
result.reset();
}
app.getPrinter().solverInvocationResult(decomposition, result.get());
return result;
}
ItemTreePtr AtomIntroductionSolver::compute()
{
const auto nodeStackElement = app.getPrinter().visitNode(decomposition);
assert(decomposition.getChildren().size() == 1);
Decomposition& childNode = **decomposition.getChildren().begin();
ItemTreePtr childResult = childNode.getSolver().compute();
ItemTreePtr result;
if(childResult) {
result = extendRoot(childResult);
assert(childResult->getChildren().empty() == false);
// Find out which rules are satisfied by setting introducedAtom to true or false, respectively, and which disappear from the reduct by setting introducedAtom to true.
// TODO unordered_set?
Rules rulesSatisfiedByTrue;
Rules rulesSatisfiedByFalse;
Rules rulesDisappearingByTrue;
for(String bagElement : decomposition.getNode().getBag()) {
AtomsInRule::const_iterator it = heads.find(bagElement);
if(it != heads.end() && it->second.find(introducedAtom) != it->second.end())
rulesSatisfiedByTrue.insert(bagElement);
it = positiveBody.find(bagElement);
if(it != positiveBody.end() && it->second.find(introducedAtom) != it->second.end())
rulesSatisfiedByFalse.insert(bagElement);
it = negativeBody.find(bagElement);
if(it != negativeBody.end() && it->second.find(introducedAtom) != it->second.end()) {
rulesSatisfiedByTrue.insert(bagElement);
rulesDisappearingByTrue.insert(bagElement);
}
}
// Guess node to extend at depth 1
for(const ItemTreePtr& childCandidate : childResult->getChildren()) {
// Make introducedAtom false
ItemTreeNode::Items candidateItems = childCandidate->getNode()->getItems();
ItemTreeNode::Items candidateAuxItems = childCandidate->getNode()->getAuxItems();
// Add satisfied rules
candidateAuxItems.insert(rulesSatisfiedByFalse.begin(), rulesSatisfiedByFalse.end());
ItemTreePtr candidate = extendCandidate(std::move(candidateItems), std::move(candidateAuxItems), childCandidate);
for(const ItemTreePtr& childCertificate : childCandidate->getChildren()) {
ItemTreeNode::Items certificateItems = childCertificate->getNode()->getItems();
ItemTreeNode::Items certificateAuxItems = childCertificate->getNode()->getAuxItems();
// Add satisfied rules
certificateAuxItems.insert(rulesSatisfiedByFalse.begin(), rulesSatisfiedByFalse.end());
candidate->addChildAndMerge(extendCertificate(std::move(certificateItems), std::move(certificateAuxItems), childCertificate));
}
result->addChildAndMerge(std::move(candidate));
// Make introducedAtom true
candidateItems = childCandidate->getNode()->getItems();
candidateItems.insert(introducedAtom);
candidateAuxItems = childCandidate->getNode()->getAuxItems();
// Add satisfied rules
candidateAuxItems.insert(rulesSatisfiedByTrue.begin(), rulesSatisfiedByTrue.end());
candidate = extendCandidate(std::move(candidateItems), std::move(candidateAuxItems), childCandidate);
for(const ItemTreePtr& childCertificate : childCandidate->getChildren()) {
// Make introducedAtom false in certificate (and add "smaller" flag)
ItemTreeNode::Items certificateItems = childCertificate->getNode()->getItems();
ItemTreeNode::Items certificateAuxItems = childCertificate->getNode()->getAuxItems();
certificateAuxItems.emplace("smaller");
certificateAuxItems.insert(rulesDisappearingByTrue.begin(), rulesDisappearingByTrue.end());
certificateAuxItems.insert(rulesSatisfiedByFalse.begin(), rulesSatisfiedByFalse.end());
candidate->addChildAndMerge(extendCertificate(std::move(certificateItems), std::move(certificateAuxItems), childCertificate));
// Make introducedAtom true in certificate
certificateItems = childCertificate->getNode()->getItems();
certificateItems.insert(introducedAtom);
certificateAuxItems = childCertificate->getNode()->getAuxItems();
certificateAuxItems.insert(rulesSatisfiedByTrue.begin(), rulesSatisfiedByTrue.end());
candidate->addChildAndMerge(extendCertificate(std::move(certificateItems), std::move(certificateAuxItems), childCertificate));
}
result->addChildAndMerge(std::move(candidate));
}
assert(!decomposition.isRoot());
if(result->finalize(app, false, app.isPruningDisabled() == false || decomposition.isRoot()) == false)
result.reset();
}
app.getPrinter().solverInvocationResult(decomposition, result.get());
return result;
}
