protected static void removeNode(MoralGraph graph, MoralGraphNode node) {
ArrayList<GraphNode> neighbors = node.getNeighbors();
for (int i = 0; i < neighbors.size(); i++) {
MoralGraphNode neighbor = (MoralGraphNode) neighbors.get(i);
neighbor.removeNeighbor(node);
}
graph.removeNode(node);
}
protected static MoralGraphNode findSimplicialNode(MoralGraph graph) {
ArrayList<GraphNode> nodes = graph.getNodes();
MoralGraphNode node = null;
for (int i = 0; i < nodes.size(); i++) {
node = (MoralGraphNode) nodes.get(i);
if (isSimplicialNode(node)) return node;
}
// No simplicial node exists return null
return null;
}
protected static ArrayList<Clique> triangulate(MoralGraph graph) {
// Heuristic: Repeatedly remove a simplicial node and if none exists
// then remove a node with the smallest size(family)
ArrayList<Clique> cliques = new ArrayList<Clique>();
// make a working copy of the graph
MoralGraph workingGraph = (MoralGraph) graph.clone();
// While there are more nodes in the working graph
while (workingGraph.size() > 0) {
// Find next node to process as a clique
MoralGraphNode node = processNextNode(workingGraph);
// create clique
cliques.add(createClique(node));
// remove node from graph
removeNode(workingGraph, node);
}
return cliques;
}
protected static MoralGraphNode findMinFillInNode(MoralGraph graph) {
ArrayList<GraphNode> nodes = graph.getNodes();
MoralGraphNode minFillInNode = null, node = null;
int fillIns = 0, minFillIns = Integer.MAX_VALUE;
for (int i = 0; i < nodes.size(); i++) {
node = (MoralGraphNode) nodes.get(i);
fillIns = numFillIns(node);
if (fillIns < minFillIns) {
minFillIns = fillIns;
minFillInNode = node;
}
}
return minFillInNode;
}
protected static MoralGraphNode findBestNode(MoralGraph graph) {
ArrayList<GraphNode> nodes = graph.getNodes();
MoralGraphNode bestNode = null, node = null;
long dom = 0, minDom = Long.MAX_VALUE;
for (int i = 0; i < nodes.size(); i++) {
node = (MoralGraphNode) nodes.get(i);
dom = domSize(node) / node.getBruseNode().getStates().size();
if ((dom < minDom) && (dom > 0)) {
minDom = dom;
bestNode = node;
}
}
return bestNode;
}
