714 lines
18 KiB
C++
714 lines
18 KiB
C++
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#include <algorithm>
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#include <set>
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#include "FoveSolver.h"
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#include "Histogram.h"
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#include "Util.h"
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vector<LiftedOperator*>
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LiftedOperator::getValidOps (
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ParfactorList& pfList,
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const Grounds& query)
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{
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vector<LiftedOperator*> validOps;
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vector<SumOutOperator*> sumOutOps;
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vector<CountingOperator*> countOps;
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vector<GroundOperator*> groundOps;
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sumOutOps = SumOutOperator::getValidOps (pfList, query);
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countOps = CountingOperator::getValidOps (pfList);
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groundOps = GroundOperator::getValidOps (pfList);
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validOps.insert (validOps.end(), sumOutOps.begin(), sumOutOps.end());
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validOps.insert (validOps.end(), countOps.begin(), countOps.end());
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validOps.insert (validOps.end(), groundOps.begin(), groundOps.end());
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return validOps;
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}
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void
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LiftedOperator::printValidOps (
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ParfactorList& pfList,
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const Grounds& query)
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{
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vector<LiftedOperator*> validOps;
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validOps = LiftedOperator::getValidOps (pfList, query);
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for (unsigned i = 0; i < validOps.size(); i++) {
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cout << "-> " << validOps[i]->toString() << endl;
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delete validOps[i];
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}
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}
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double
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SumOutOperator::getLogCost (void)
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{
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TinySet<unsigned> groupSet;
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ParfactorList::const_iterator pfIter = pfList_.begin();
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while (pfIter != pfList_.end()) {
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if ((*pfIter)->containsGroup (group_)) {
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vector<unsigned> groups = (*pfIter)->getAllGroups();
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groupSet |= TinySet<unsigned> (groups);
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}
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++ pfIter;
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}
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double cost = 1.0;
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for (unsigned i = 0; i < groupSet.size(); i++) {
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pfIter = pfList_.begin();
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while (pfIter != pfList_.end()) {
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if ((*pfIter)->containsGroup (groupSet[i])) {
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int idx = (*pfIter)->indexOfGroup (groupSet[i]);
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cost *= (*pfIter)->range (idx);
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break;
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}
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++ pfIter;
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}
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}
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return std::log (cost);
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}
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void
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SumOutOperator::apply (void)
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{
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vector<ParfactorList::iterator> iters
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= parfactorsWithGroup (pfList_, group_);
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Parfactor* product = *(iters[0]);
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pfList_.remove (iters[0]);
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for (unsigned i = 1; i < iters.size(); i++) {
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product->multiply (**(iters[i]));
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pfList_.removeAndDelete (iters[i]);
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}
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if (product->nrArguments() == 1) {
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delete product;
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return;
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}
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int fIdx = product->indexOfGroup (group_);
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LogVarSet excl = product->exclusiveLogVars (fIdx);
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if (product->constr()->isCountNormalized (excl)) {
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product->sumOut (fIdx);
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pfList_.addShattered (product);
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} else {
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Parfactors pfs = FoveSolver::countNormalize (product, excl);
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for (unsigned i = 0; i < pfs.size(); i++) {
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pfs[i]->sumOut (fIdx);
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pfList_.add (pfs[i]);
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}
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delete product;
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}
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}
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vector<SumOutOperator*>
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SumOutOperator::getValidOps (
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ParfactorList& pfList,
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const Grounds& query)
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{
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vector<SumOutOperator*> validOps;
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set<unsigned> allGroups;
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ParfactorList::const_iterator it = pfList.begin();
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while (it != pfList.end()) {
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const ProbFormulas& formulas = (*it)->arguments();
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for (unsigned i = 0; i < formulas.size(); i++) {
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allGroups.insert (formulas[i].group());
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}
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++ it;
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}
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set<unsigned>::const_iterator groupIt = allGroups.begin();
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while (groupIt != allGroups.end()) {
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if (validOp (*groupIt, pfList, query)) {
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validOps.push_back (new SumOutOperator (*groupIt, pfList));
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}
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++ groupIt;
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}
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return validOps;
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}
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string
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SumOutOperator::toString (void)
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{
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stringstream ss;
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vector<ParfactorList::iterator> pfIters;
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pfIters = parfactorsWithGroup (pfList_, group_);
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int idx = (*pfIters[0])->indexOfGroup (group_);
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ProbFormula f = (*pfIters[0])->argument (idx);
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TupleSet tupleSet = (*pfIters[0])->constr()->tupleSet (f.logVars());
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ss << "sum out " << f.functor() << "/" << f.arity();
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ss << "|" << tupleSet << " (group " << group_ << ")";
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ss << " [cost=" << getLogCost() << "]" << endl;
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return ss.str();
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}
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bool
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SumOutOperator::validOp (
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unsigned group,
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ParfactorList& pfList,
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const Grounds& query)
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{
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vector<ParfactorList::iterator> pfIters;
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pfIters = parfactorsWithGroup (pfList, group);
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if (isToEliminate (*pfIters[0], group, query) == false) {
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return false;
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}
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unordered_map<unsigned, unsigned> groupToRange;
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for (unsigned i = 0; i < pfIters.size(); i++) {
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int fIdx = (*pfIters[i])->indexOfGroup (group);
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if ((*pfIters[i])->argument (fIdx).contains (
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(*pfIters[i])->elimLogVars()) == false) {
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return false;
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}
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vector<unsigned> ranges = (*pfIters[i])->ranges();
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vector<unsigned> groups = (*pfIters[i])->getAllGroups();
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for (unsigned i = 0; i < groups.size(); i++) {
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unordered_map<unsigned, unsigned>::iterator it;
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it = groupToRange.find (groups[i]);
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if (it == groupToRange.end()) {
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groupToRange.insert (make_pair (groups[i], ranges[i]));
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} else {
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if (it->second != ranges[i]) {
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return false;
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}
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}
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}
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}
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return true;
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}
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vector<ParfactorList::iterator>
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SumOutOperator::parfactorsWithGroup (
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ParfactorList& pfList,
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unsigned group)
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{
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vector<ParfactorList::iterator> iters;
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ParfactorList::iterator pflIt = pfList.begin();
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while (pflIt != pfList.end()) {
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if ((*pflIt)->containsGroup (group)) {
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iters.push_back (pflIt);
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}
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++ pflIt;
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}
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return iters;
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}
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bool
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SumOutOperator::isToEliminate (
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Parfactor* g,
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unsigned group,
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const Grounds& query)
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{
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int fIdx = g->indexOfGroup (group);
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const ProbFormula& formula = g->argument (fIdx);
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bool toElim = true;
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for (unsigned i = 0; i < query.size(); i++) {
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if (formula.functor() == query[i].functor() &&
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formula.arity() == query[i].arity()) {
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g->constr()->moveToTop (formula.logVars());
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if (g->constr()->containsTuple (query[i].args())) {
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toElim = false;
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break;
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}
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}
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}
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return toElim;
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}
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double
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CountingOperator::getLogCost (void)
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{
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double cost = 0.0;
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int fIdx = (*pfIter_)->indexOfLogVar (X_);
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unsigned range = (*pfIter_)->range (fIdx);
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unsigned size = (*pfIter_)->size() / range;
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TinySet<unsigned> counts;
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counts = (*pfIter_)->constr()->getConditionalCounts (X_);
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for (unsigned i = 0; i < counts.size(); i++) {
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cost += size * HistogramSet::nrHistograms (counts[i], range);
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}
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return std::log (cost);
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}
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void
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CountingOperator::apply (void)
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{
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if ((*pfIter_)->constr()->isCountNormalized (X_)) {
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(*pfIter_)->countConvert (X_);
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} else {
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Parfactor* pf = *pfIter_;
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pfList_.remove (pfIter_);
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Parfactors pfs = FoveSolver::countNormalize (pf, X_);
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for (unsigned i = 0; i < pfs.size(); i++) {
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unsigned condCount = pfs[i]->constr()->getConditionalCount (X_);
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bool cartProduct = pfs[i]->constr()->isCarteesianProduct (
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pfs[i]->countedLogVars() | X_);
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if (condCount > 1 && cartProduct) {
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pfs[i]->countConvert (X_);
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}
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pfList_.add (pfs[i]);
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}
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delete pf;
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}
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}
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vector<CountingOperator*>
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CountingOperator::getValidOps (ParfactorList& pfList)
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{
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vector<CountingOperator*> validOps;
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ParfactorList::iterator it = pfList.begin();
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while (it != pfList.end()) {
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LogVarSet candidates = (*it)->uncountedLogVars();
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for (unsigned i = 0; i < candidates.size(); i++) {
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if (validOp (*it, candidates[i])) {
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validOps.push_back (new CountingOperator (
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it, candidates[i], pfList));
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}
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}
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++ it;
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}
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return validOps;
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}
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string
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CountingOperator::toString (void)
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{
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stringstream ss;
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ss << "count convert " << X_ << " in " ;
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ss << (*pfIter_)->getLabel();
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ss << " [cost=" << getLogCost() << "]" << endl;
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Parfactors pfs = FoveSolver::countNormalize (*pfIter_, X_);
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if ((*pfIter_)->constr()->isCountNormalized (X_) == false) {
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for (unsigned i = 0; i < pfs.size(); i++) {
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ss << " º " << pfs[i]->getLabel() << endl;
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}
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}
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for (unsigned i = 0; i < pfs.size(); i++) {
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delete pfs[i];
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}
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return ss.str();
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}
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bool
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CountingOperator::validOp (Parfactor* g, LogVar X)
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{
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if (g->nrFormulas (X) != 1) {
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return false;
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}
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int fIdx = g->indexOfLogVar (X);
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if (g->argument (fIdx).isCounting()) {
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return false;
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}
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bool countNormalized = g->constr()->isCountNormalized (X);
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if (countNormalized) {
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unsigned condCount = g->constr()->getConditionalCount (X);
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bool cartProduct = g->constr()->isCarteesianProduct (
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g->countedLogVars() | X);
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if (condCount == 1 || cartProduct == false) {
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return false;
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}
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}
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return true;
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}
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double
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GroundOperator::getLogCost (void)
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{
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double cost = 0.0;
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bool isCountingLv = (*pfIter_)->countedLogVars().contains (X_);
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if (isCountingLv) {
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int fIdx = (*pfIter_)->indexOfLogVar (X_);
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unsigned currSize = (*pfIter_)->size();
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unsigned nrHists = (*pfIter_)->range (fIdx);
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unsigned nrSymbols = (*pfIter_)->constr()->getConditionalCount (X_);
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unsigned range = (*pfIter_)->argument (fIdx).range();
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double power = std::log (range) * nrSymbols;
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cost = std::log (currSize / nrHists) + power;
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} else {
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unsigned currSize = (*pfIter_)->size();
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cost = std::log ((*pfIter_)->constr()->nrSymbols (X_) * currSize);
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}
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return cost;
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}
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void
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GroundOperator::apply (void)
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{
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bool countedLv = (*pfIter_)->countedLogVars().contains (X_);
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Parfactor* pf = *pfIter_;
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pfList_.remove (pfIter_);
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if (countedLv) {
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pf->fullExpand (X_);
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pfList_.add (pf);
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} else {
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ConstraintTrees cts = pf->constr()->ground (X_);
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for (unsigned i = 0; i < cts.size(); i++) {
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pfList_.add (new Parfactor (pf, cts[i]));
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}
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delete pf;
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}
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}
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vector<GroundOperator*>
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GroundOperator::getValidOps (ParfactorList& pfList)
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{
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vector<GroundOperator*> validOps;
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ParfactorList::iterator pfIter = pfList.begin();
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while (pfIter != pfList.end()) {
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LogVarSet set = (*pfIter)->logVarSet();
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for (unsigned i = 0; i < set.size(); i++) {
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if ((*pfIter)->constr()->isSingleton (set[i]) == false) {
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validOps.push_back (new GroundOperator (pfIter, set[i], pfList));
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}
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}
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++ pfIter;
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}
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return validOps;
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}
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string
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GroundOperator::toString (void)
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{
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stringstream ss;
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((*pfIter_)->countedLogVars().contains (X_))
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? ss << "full expanding "
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: ss << "grounding " ;
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ss << X_ << " in " << (*pfIter_)->getLabel();
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ss << " [cost=" << getLogCost() << "]" << endl;
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return ss.str();
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}
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Params
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FoveSolver::getPosterioriOf (const Ground& query)
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{
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return getJointDistributionOf ({query});
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}
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Params
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FoveSolver::getJointDistributionOf (const Grounds& query)
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{
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runSolver (query);
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(*pfList_.begin())->normalize();
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Params params = (*pfList_.begin())->params();
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if (Globals::logDomain) {
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Util::fromLog (params);
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}
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return params;
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}
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void
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FoveSolver::absorveEvidence (
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ParfactorList& pfList,
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ObservedFormulas& obsFormulas)
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{
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for (unsigned i = 0; i < obsFormulas.size(); i++) {
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Parfactors newPfs;
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ParfactorList::iterator it = pfList.begin();
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while (it != pfList.end()) {
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Parfactor* pf = *it;
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it = pfList.remove (it);
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Parfactors absorvedPfs = absorve (obsFormulas[i], pf);
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if (absorvedPfs.empty() == false) {
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if (absorvedPfs.size() == 1 && absorvedPfs[0] == 0) {
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// just remove pf;
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} else {
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Util::addToVector (newPfs, absorvedPfs);
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}
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delete pf;
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} else {
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it = pfList.insertShattered (it, pf);
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++ it;
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}
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}
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pfList.add (newPfs);
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}
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if (Constants::DEBUG >= 2 && obsFormulas.empty() == false) {
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Util::printAsteriskLine();
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cout << "AFTER EVIDENCE ABSORVED" << endl;
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for (unsigned i = 0; i < obsFormulas.size(); i++) {
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cout << " -> " << obsFormulas[i] << endl;
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}
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Util::printAsteriskLine();
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pfList.print();
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}
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}
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Parfactors
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FoveSolver::countNormalize (
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Parfactor* g,
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const LogVarSet& set)
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{
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Parfactors normPfs;
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if (set.empty()) {
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normPfs.push_back (new Parfactor (*g));
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} else {
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ConstraintTrees normCts = g->constr()->countNormalize (set);
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for (unsigned i = 0; i < normCts.size(); i++) {
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normPfs.push_back (new Parfactor (g, normCts[i]));
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}
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}
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return normPfs;
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}
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void
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FoveSolver::runSolver (const Grounds& query)
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{
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shatterAgainstQuery (query);
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runWeakBayesBall (query);
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while (true) {
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if (Constants::DEBUG >= 2) {
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Util::printDashedLine();
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pfList_.print();
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LiftedOperator::printValidOps (pfList_, query);
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}
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LiftedOperator* op = getBestOperation (query);
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if (op == 0) {
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break;
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}
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if (Constants::DEBUG >= 2) {
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cout << "best operation: " << op->toString() << endl;
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}
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op->apply();
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delete op;
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}
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assert (pfList_.size() > 0);
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if (pfList_.size() > 1) {
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ParfactorList::iterator pfIter = pfList_.begin();
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pfIter ++;
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while (pfIter != pfList_.end()) {
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(*pfList_.begin())->multiply (**pfIter);
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++ pfIter;
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}
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}
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(*pfList_.begin())->reorderAccordingGrounds (query);
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}
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LiftedOperator*
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FoveSolver::getBestOperation (const Grounds& query)
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{
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double bestCost = 0.0;
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LiftedOperator* bestOp = 0;
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vector<LiftedOperator*> validOps;
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validOps = LiftedOperator::getValidOps (pfList_, query);
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for (unsigned i = 0; i < validOps.size(); i++) {
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double cost = validOps[i]->getLogCost();
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if ((bestOp == 0) || (cost < bestCost)) {
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bestOp = validOps[i];
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bestCost = cost;
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}
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}
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for (unsigned i = 0; i < validOps.size(); i++) {
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if (validOps[i] != bestOp) {
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delete validOps[i];
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}
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}
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return bestOp;
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}
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void
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FoveSolver::runWeakBayesBall (const Grounds& query)
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{
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queue<unsigned> todo; // groups to process
|
|
set<unsigned> done; // processed or in queue
|
|
for (unsigned i = 0; i < query.size(); i++) {
|
|
ParfactorList::iterator it = pfList_.begin();
|
|
while (it != pfList_.end()) {
|
|
int group = (*it)->findGroup (query[i]);
|
|
if (group != -1) {
|
|
todo.push (group);
|
|
done.insert (group);
|
|
break;
|
|
}
|
|
++ it;
|
|
}
|
|
}
|
|
|
|
set<Parfactor*> requiredPfs;
|
|
while (todo.empty() == false) {
|
|
unsigned group = todo.front();
|
|
ParfactorList::iterator it = pfList_.begin();
|
|
while (it != pfList_.end()) {
|
|
if (Util::contains (requiredPfs, *it) == false &&
|
|
(*it)->containsGroup (group)) {
|
|
vector<unsigned> groups = (*it)->getAllGroups();
|
|
for (unsigned i = 0; i < groups.size(); i++) {
|
|
if (Util::contains (done, groups[i]) == false) {
|
|
todo.push (groups[i]);
|
|
done.insert (groups[i]);
|
|
}
|
|
}
|
|
requiredPfs.insert (*it);
|
|
}
|
|
++ it;
|
|
}
|
|
todo.pop();
|
|
}
|
|
|
|
ParfactorList::iterator it = pfList_.begin();
|
|
while (it != pfList_.end()) {
|
|
if (Util::contains (requiredPfs, *it) == false) {
|
|
it = pfList_.removeAndDelete (it);
|
|
} else {
|
|
++ it;
|
|
}
|
|
}
|
|
|
|
if (Constants::DEBUG >= 2) {
|
|
Util::printHeader ("REQUIRED PARFACTORS");
|
|
pfList_.print();
|
|
}
|
|
}
|
|
|
|
|
|
|
|
void
|
|
FoveSolver::shatterAgainstQuery (const Grounds& query)
|
|
{
|
|
for (unsigned i = 0; i < query.size(); i++) {
|
|
if (query[i].isAtom()) {
|
|
continue;
|
|
}
|
|
bool found = false;
|
|
Parfactors newPfs;
|
|
ParfactorList::iterator it = pfList_.begin();
|
|
while (it != pfList_.end()) {
|
|
if ((*it)->containsGround (query[i])) {
|
|
found = true;
|
|
std::pair<ConstraintTree*, ConstraintTree*> split =
|
|
(*it)->constr()->split (query[i].args(), query[i].arity());
|
|
ConstraintTree* commCt = split.first;
|
|
ConstraintTree* exclCt = split.second;
|
|
newPfs.push_back (new Parfactor (*it, commCt));
|
|
if (exclCt->empty() == false) {
|
|
newPfs.push_back (new Parfactor (*it, exclCt));
|
|
} else {
|
|
delete exclCt;
|
|
}
|
|
it = pfList_.removeAndDelete (it);
|
|
} else {
|
|
++ it;
|
|
}
|
|
}
|
|
if (found == false) {
|
|
cerr << "error: could not find a parfactor with ground " ;
|
|
cerr << "`" << query[i] << "'" << endl;
|
|
exit (0);
|
|
}
|
|
pfList_.add (newPfs);
|
|
}
|
|
if (Constants::DEBUG >= 2) {
|
|
cout << endl;
|
|
Util::printAsteriskLine();
|
|
cout << "SHATTERED AGAINST THE QUERY" << endl;
|
|
for (unsigned i = 0; i < query.size(); i++) {
|
|
cout << " -> " << query[i] << endl;
|
|
}
|
|
Util::printAsteriskLine();
|
|
pfList_.print();
|
|
}
|
|
}
|
|
|
|
|
|
|
|
Parfactors
|
|
FoveSolver::absorve (
|
|
ObservedFormula& obsFormula,
|
|
Parfactor* g)
|
|
{
|
|
Parfactors absorvedPfs;
|
|
const ProbFormulas& formulas = g->arguments();
|
|
for (unsigned i = 0; i < formulas.size(); i++) {
|
|
if (obsFormula.functor() == formulas[i].functor() &&
|
|
obsFormula.arity() == formulas[i].arity()) {
|
|
|
|
if (obsFormula.isAtom()) {
|
|
if (formulas.size() > 1) {
|
|
g->absorveEvidence (formulas[i], obsFormula.evidence());
|
|
} else {
|
|
// hack to erase parfactor g
|
|
absorvedPfs.push_back (0);
|
|
}
|
|
break;
|
|
}
|
|
|
|
g->constr()->moveToTop (formulas[i].logVars());
|
|
std::pair<ConstraintTree*, ConstraintTree*> res
|
|
= g->constr()->split (&(obsFormula.constr()), formulas[i].arity());
|
|
ConstraintTree* commCt = res.first;
|
|
ConstraintTree* exclCt = res.second;
|
|
|
|
if (commCt->empty() == false) {
|
|
if (formulas.size() > 1) {
|
|
LogVarSet excl = g->exclusiveLogVars (i);
|
|
Parfactors countNormPfs = countNormalize (g, excl);
|
|
for (unsigned j = 0; j < countNormPfs.size(); j++) {
|
|
countNormPfs[j]->absorveEvidence (
|
|
formulas[i], obsFormula.evidence());
|
|
absorvedPfs.push_back (countNormPfs[j]);
|
|
}
|
|
} else {
|
|
delete commCt;
|
|
}
|
|
if (exclCt->empty() == false) {
|
|
absorvedPfs.push_back (new Parfactor (g, exclCt));
|
|
} else {
|
|
delete exclCt;
|
|
}
|
|
if (absorvedPfs.empty()) {
|
|
// hack to erase parfactor g
|
|
absorvedPfs.push_back (0);
|
|
}
|
|
break;
|
|
} else {
|
|
delete commCt;
|
|
delete exclCt;
|
|
}
|
|
}
|
|
}
|
|
return absorvedPfs;
|
|
}
|
|
|