double MaxCPlanarMaster::heuristicInitialLowerBound()
{
double lbound = 0.0;
//In case we only have a single (root) cluster, we can
//use the result of a fast Max Planar Subgraph heuristic
//to initialize the lower bound
if ( (m_C->numberOfClusters() == 1) && (m_mpHeuristic) )
{
//we run both heuristics that currently exist in OGDF
//MaxSimple
MaximalPlanarSubgraphSimple<int> simpleHeur;
List<edge> delEdgesList;
PlanarSubgraphFast<int> fastHeur;
fastHeur.runs(m_fastHeuristicRuns);
List<edge> delEdgesListFast;
List<edge> *delEdges;
if(m_pCost == nullptr) {
simpleHeur.call(*m_G, delEdgesList);
fastHeur.call(*m_G, delEdgesListFast);
delEdges = delEdgesList.size() < delEdgesListFast.size() ? &delEdgesList : &delEdgesListFast;
lbound = m_G->numberOfEdges()-min(delEdgesList.size(), delEdgesListFast.size());
} else {
simpleHeur.call(*m_G, *m_pCost, delEdgesList);
fastHeur.call(*m_G, *m_pCost, delEdgesListFast);
int total = 0;
for(edge e : m_G->edges) {
total += (*m_pCost)[e];
}
int del = 0;
for(edge e : delEdgesList) {
del += (*m_pCost)[e];
}
int delFast = 0;
for(edge e : delEdgesListFast) {
delFast += (*m_pCost)[e];
}
delEdges = del < delFast ? &delEdgesList : &delEdgesListFast;
lbound = total - min(del, delFast);
}
m_deletedOriginalEdges.clear();
for(edge e : *delEdges) {
m_deletedOriginalEdges.pushBack(e);
}
if (!isConnected(*m_G)) lbound = lbound-1.0; //#edges*epsilon
}
return lbound;
}
double MaxCPlanarMaster::heuristicInitialLowerBound()
{
double lbound = 0.0;
//In case we only have a single (root) cluster, we can
//use the result of a fast Max Planar Subgraph heuristic
//to initialize the lower bound
if ( (m_C->numberOfClusters() == 1) && (m_mpHeuristic) )
{
//we run both heuristics that currently exist in OGDF
//MaxSimple
MaximalPlanarSubgraphSimple simpleHeur;
List<edge> delEdgesList;
simpleHeur.call(*m_G, delEdgesList);
FastPlanarSubgraph fastHeur;
fastHeur.runs(m_fastHeuristicRuns);
List<edge> delEdgesListFast;
fastHeur.call(*m_G, delEdgesListFast);
lbound = m_G->numberOfEdges()-min(delEdgesList.size(), delEdgesListFast.size());
if (!isConnected(*m_G)) lbound = lbound-1.0; //#edges*epsilon
}//if heuristics used
return lbound;
}//heuristicInitialLowerBound
