/**
* Creates and adds a ground active clause.
*
* @param activeGroundClauses If not NULL, then active GroundClauses are
* accumulated here.
* @param seenGndPreds GroundPredicates which have been seen before. Used when
* accumulating GroundClauses.
* @param db Database used to check truth values and evidence status of
* predicates.
* @param getSatisfied If true, satisfied clauses are also retrieved.
*/
bool Clause::createAndAddActiveClause(
Array<GroundClause *> * const & activeGroundClauses,
GroundPredicateHashArray* const& seenGndPreds,
const Database* const & db,
bool const & getSatisfied)
{
bool accumulateClauses = activeGroundClauses;
Predicate *cpred;
PredicateSet predSet; // used to detect duplicates
PredicateSet::iterator iter;
GroundClause *groundClause;
Clause* clause = NULL;
bool isEmpty = true;
for (int i = 0; i < predicates_->size(); i++)
{
Predicate* predicate = (*predicates_)[i];
assert(predicate);
assert(predicate->isGrounded());
if ( (iter = predSet.find(predicate)) != predSet.end() )
{
// The two gnd preds are of opp sense, so clause must be satisfied
// and no point in adding it
if (wt_ >= 0 && !getSatisfied &&
(*iter)->getSense() != predicate->getSense())
{
if (clause) delete clause;
return false;
}
// Since the two gnd preds are identical, no point adding a dup
continue;
}
else
predSet.insert(predicate);
bool isEvidence = db->getEvidenceStatus(predicate);
if (clausedebug >= 2)
{
cout << "isEvidence " << isEvidence << endl;
predicate->printWithStrVar(cout, db->getDomain());
cout << endl;
}
if (!isEvidence)
isEmpty = false;
// True evidence in a neg. clause: Discard clause
if (wt_ < 0 && isEvidence && !getSatisfied &&
db->sameTruthValueAndSense(db->getValue(predicate),
predicate->getSense()))
{
if (clause) delete clause;
return false;
}
// Add only non-evidence prdicates
if (accumulateClauses && !isEvidence)
{
if (!clause) clause = new Clause();
cpred = new Predicate(*predicate, clause);
assert(cpred);
if (clausedebug >= 2)
{
cout << "Appending pred ";
predicate->printWithStrVar(cout, db->getDomain());
cout << " to clause ";
clause->print(cout, db->getDomain());
cout << endl;
}
clause->appendPredicate(cpred);
if (clausedebug >= 2) cout << "Appended pred to clause" << endl;
}
}
// If the clause is empty after taking evidence into account, it should
// be discarded
if (isEmpty)
{
if (clausedebug >= 2) cout << "Clause is empty" << endl;
assert(!clause);
return false;
}
// Came to this point means that the clause is active (and hence nonEmpty)
else
{
// Add the corresponding ground clause if accumulateClauses is true
if (accumulateClauses)
{
assert(clause);
if (clausedebug >= 2) cout << "Canonicalizing clause" << endl;
clause->canonicalizeWithoutVariables();
groundClause = new GroundClause(clause, seenGndPreds);
if (isHardClause_)
groundClause->setWtToHardWt();
if (clausedebug >= 2) cout << "Appending ground clause to active set" << endl;
activeGroundClauses->appendUnique(groundClause);
delete clause;
}
return true;
}
}
//add a constant tuple to the list of constant tuples
inline void Clause::addConstantTuple(const Domain* const & domain,
const Database* const & db,
const Clause * const & varClause,
Array<int> * const & constants,
Array<Variable *> * const & eqVars,
ClauseToSuperClauseMap* const & clauseToSuperClause,
bool useImplicit)
{
// used to detect duplicates
PredicateSet predSet;
PredicateSet::iterator iter;
Predicate *predicate;
Clause *clause = new Clause();
//first make sure the clause is not satisfied (because of presence of two
//identical gnd preds with opposite senses)
for (int i = 0; i < predicates_->size(); i++)
{
predicate = (*predicates_)[i];
assert(predicate->isGrounded());
/*
if (db->getValue(predicate) == UNKNOWN)
{
clause->appendPredicate(varClause->getPredicate(i));
if ( (iter=predSet.find(predicate)) != predSet.end() )
{
// the two gnd preds are of opp sense, so clause must be satisfied
if ((*iter)->getSense() != predicate->getSense())
{
clause->removeAllPredicates();
delete clause;
return;
}
// since the two gnd preds are identical, no point adding a dup
continue;
}
else
predSet.insert(predicate);
} */
//- this so that it matches the hypercube representation.
//There is no real need to simplify the clause!
if (db->getValue(predicate) == UNKNOWN)
{
clause->appendPredicate(varClause->getPredicate(i));
}
}
SuperClause *superClause;
ClauseToSuperClauseMap::iterator itr;
Clause *keyClause;
Array<int> * varIdToCanonicalVarId;
Array<int> * canonicalConstants;
Array<Variable *> * canonicalEqVars;
//Slightly different Imeplementation for SuperClause
bool useCT = false;
IntArrayHashArray *neqConstraints = NULL;
//nothing to do if the clause has no predicate
if (clause->getNumPredicates() == 0)
{
delete clause;
return;
}
itr = clauseToSuperClause->find(clause);
if (itr == clauseToSuperClause->end())
{
//it is best to create a completely new copy of the clause
//at this point
keyClause = new Clause(*clause);
keyClause->setWt(this->getWt());
keyClause->setUtil(this->getUtil());
keyClause->setAction(this->isActionFactor());
//keyClause->setWt(1);
int varCnt = constants->size();
varIdToCanonicalVarId = new Array<int>(varCnt, -1);
keyClause->canonicalize(varIdToCanonicalVarId);
canonicalEqVars = getCanonicalArray(eqVars, varIdToCanonicalVarId);
//Slightly different Imeplementation for SuperClause
superClause = new SuperClause(keyClause, neqConstraints,
varIdToCanonicalVarId, useCT, wt_);
(*clauseToSuperClause)[clause] = superClause;
delete canonicalEqVars;
//delete varIdToCanonicalVarId;
}
else
{
superClause = itr->second;
//sort of a hack, but it works:
//may need to increase the size of varIdToCanonicalVarId map
int varCnt = constants->size();
varIdToCanonicalVarId = superClause->getVarIdToCanonicalVarId();
varIdToCanonicalVarId->growToSize(varCnt,-1);
//delete the clause. Predicates should not be deleted, as
//they belong to the varClause
clause->removeAllPredicates();
delete clause;
}
varIdToCanonicalVarId = superClause->getVarIdToCanonicalVarId();
canonicalConstants = getCanonicalArray(constants, varIdToCanonicalVarId);
//superClause->addNewConstantsAndIncrementCount(canonicalConstants,this->getWt());
superClause->addNewConstantsAndIncrementCount(canonicalConstants,1);
//clean up
delete canonicalConstants;
}
//returns true if the (ground) clause has two literals with opposite sense
//i.e. the clause is satisfied; otherwise returns false
bool Clause::createAndAddUnknownClause(
Array<GroundClause*>* const& unknownGndClauses,
Array<Clause*>* const& unknownClauses,
double* const & numUnknownClauses,
const AddGroundClauseStruct* const & agcs,
const Database* const & db)
{
PredicateSet predSet; // used to detect duplicates
PredicateSet::iterator iter;
Clause* clause = NULL;
for (int i = 0; i < predicates_->size(); i++)
{
Predicate* predicate = (*predicates_)[i];
assert(predicate->isGrounded());
if (db->getValue(predicate) == UNKNOWN)
{
if ( (iter=predSet.find(predicate)) != predSet.end() )
{
// the two gnd preds are of opp sense, so clause must be satisfied
if ((*iter)->getSense() != predicate->getSense())
{
if (clause) delete clause;
return true;
}
// since the two gnd preds are identical, no point adding a dup
continue;
}
else
predSet.insert(predicate);
if (clause == NULL) clause = new Clause();
Predicate* pred = new Predicate(*predicate, clause);
clause->appendPredicate(pred);
}
}
if (clause)
{
if (numUnknownClauses) (*numUnknownClauses)++;
clause->setWt(wt_);
clause->canonicalizeWithoutVariables();
if (agcs)
{
if (clausedebug >= 2)
{
cout << "Appending unknown clause to MRF ";
clause->print(cout, db->getDomain());
cout << endl;
}
MRF::addUnknownGndClause(agcs, this, clause, isHardClause_);
}
// MARC: The case with unknownGndClauses appears to be obsolete!
if (unknownGndClauses)
{
if (clausedebug >= 2)
{
cout << "Appending unknown ground clause ";
clause->print(cout, db->getDomain());
cout << endl;
}
unknownGndClauses->append(new GroundClause(clause, agcs->gndPreds));
if (isHardClause_) unknownGndClauses->lastItem()->setWtToHardWt();
}
else if (unknownClauses)
{
if (clausedebug >= 2)
{
cout << "Appending unknown clause ";
clause->print(cout, db->getDomain());
cout << endl;
}
unknownClauses->append(clause);
if (isHardClause_) clause->setIsHardClause(true);
}
if (unknownClauses == NULL) delete clause;
}
return false;
}