public Graph createGraph(Clustering[] clusts) {
Clustering c = clusts[0];
// total number of items
int n = c.instancesCount();
Graph graph = new AdjListGraph();
Object2LongOpenHashMap<Instance> mapping = new Object2LongOpenHashMap();
Instance a, b;
Node na, nb;
// cluster membership
int ca, cb;
int x = 0;
Edge edge;
// accumulate evidence
for (Clustering clust : clusts) {
System.out.println("reducing " + (x++));
for (int i = 1; i < n; i++) {
a = clust.instance(i);
na = fetchNode(graph, mapping, a);
ca = clust.assignedCluster(a.getIndex());
for (int j = 0; j < i; j++) {
b = clust.instance(j);
nb = fetchNode(graph, mapping, b);
// for each pair of instances check if placed in the same cluster
cb = clust.assignedCluster(b.getIndex());
if (ca == cb) {
edge = graph.getEdge(na, nb);
// check if exists
if (edge == null) {
edge = graph.getFactory().newEdge(na, nb, 0, 0, false);
graph.addEdge(edge);
}
// increase weight by 1
edge.setWeight(edge.getWeight() + 1.0);
}
}
}
}
return graph;
}
private Node createNode(Graph g, Object2LongOpenHashMap<Instance> mapping, Instance inst) {
Node node = g.getFactory().newNode(inst);
mapping.put(inst, node.getId());
g.addNode(node);
return node;
}