100 lines
2.4 KiB
C++
100 lines
2.4 KiB
C++
#include <cassert>
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#include "BayesBall.h"
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namespace Horus {
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BayesBall::BayesBall (FactorGraph& fg)
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: fg_(fg) , dag_(fg.getStructure())
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{
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dag_.clear();
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}
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FactorGraph*
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BayesBall::getMinimalFactorGraph (FactorGraph& fg, VarIds vids)
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{
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BayesBall bb (fg);
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return bb.getMinimalFactorGraph (vids);
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}
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FactorGraph*
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BayesBall::getMinimalFactorGraph (const VarIds& queryIds)
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{
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assert (fg_.bayesianFactors());
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Scheduling scheduling;
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for (size_t i = 0; i < queryIds.size(); i++) {
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assert (dag_.getNode (queryIds[i]));
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BBNode* n = dag_.getNode (queryIds[i]);
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scheduling.push (ScheduleInfo (n, false, true));
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}
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while (!scheduling.empty()) {
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ScheduleInfo& sch = scheduling.front();
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BBNode* n = sch.node;
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n->setAsVisited();
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if (n->hasEvidence() == false && sch.visitedFromChild) {
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if (n->isMarkedAbove() == false) {
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n->markAbove();
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scheduleParents (n, scheduling);
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}
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if (n->isMarkedBelow() == false) {
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n->markBelow();
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scheduleChilds (n, scheduling);
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}
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}
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if (sch.visitedFromParent) {
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if (n->hasEvidence() && n->isMarkedAbove() == false) {
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n->markAbove();
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scheduleParents (n, scheduling);
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}
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if (n->hasEvidence() == false && n->isMarkedBelow() == false) {
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n->markBelow();
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scheduleChilds (n, scheduling);
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}
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}
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scheduling.pop();
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}
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FactorGraph* fg = new FactorGraph();
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constructGraph (fg);
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return fg;
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}
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void
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BayesBall::constructGraph (FactorGraph* fg) const
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{
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const FacNodes& facNodes = fg_.facNodes();
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for (size_t i = 0; i < facNodes.size(); i++) {
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const BBNode* n = dag_.getNode (
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facNodes[i]->factor().argument (0));
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if (n->isMarkedAbove()) {
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fg->addFactor (facNodes[i]->factor());
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} else if (n->hasEvidence() && n->isVisited()) {
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VarIds varIds = { facNodes[i]->factor().argument (0) };
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Ranges ranges = { facNodes[i]->factor().range (0) };
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Params params (ranges[0], LogAware::noEvidence());
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params[n->getEvidence()] = LogAware::withEvidence();
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fg->addFactor (Factor (varIds, ranges, params));
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}
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}
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const VarNodes& varNodes = fg_.varNodes();
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for (size_t i = 0; i < varNodes.size(); i++) {
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if (varNodes[i]->hasEvidence()) {
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VarNode* vn = fg->getVarNode (varNodes[i]->varId());
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if (vn) {
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vn->setEvidence (varNodes[i]->getEvidence());
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}
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}
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}
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}
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} // namespace Horus
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