CommunityStructure(Graph hgraph) {
this.graph = hgraph;
N = hgraph.getNodeCount();
invMap = new HashMap<>();
nodeConnectionsWeight = new HashMap[N];
nodeConnectionsCount = new HashMap[N];
nodeCommunities = new Community[N];
map = new HashMap<>();
topology = new LinkedList[N];
communities = new LinkedList<>();
int index = 0;
weights = new double[N];
for (Node node : hgraph.getNodes()) {
map.put(node, index);
nodeCommunities[index] = new Community(this);
nodeConnectionsWeight[index] = new HashMap<>();
nodeConnectionsCount[index] = new HashMap<>();
weights[index] = 0;
nodeCommunities[index].seed(index);
Community hidden = new Community(structure);
hidden.nodes.add(index);
invMap.put(index, hidden);
communities.add(nodeCommunities[index]);
index++;
}
for (Node node : hgraph.getNodes()) {
int node_index = map.get(node);
topology[node_index] = new LinkedList<>();
for (Node neighbor : hgraph.getNeighbors(node)) {
if (node == neighbor) {
continue;
}
int neighbor_index = map.get(neighbor);
double weight = 1; // TODO : change to actual weight
weights[node_index] += weight;
Edge me = new Edge(node_index, neighbor_index, weight);
topology[node_index].add(me);
Community adjCom = nodeCommunities[neighbor_index];
nodeConnectionsWeight[node_index].put(adjCom, weight);
nodeConnectionsCount[node_index].put(adjCom, 1);
nodeCommunities[node_index].connectionsWeight.put(adjCom, weight);
nodeCommunities[node_index].connectionsCount.put(adjCom, 1);
nodeConnectionsWeight[neighbor_index].put(nodeCommunities[node_index], weight);
nodeConnectionsCount[neighbor_index].put(nodeCommunities[node_index], 1);
nodeCommunities[neighbor_index].connectionsWeight.put(
nodeCommunities[node_index], weight);
nodeCommunities[neighbor_index].connectionsCount.put(nodeCommunities[node_index], 1);
graphWeightSum += weight;
}
}
graphWeightSum /= 2.0;
}
public int buildCommunities(Graph hgraph) {
int[] comStructure = new int[hgraph.getNodeCount()];
computeModularity(hgraph, structure, comStructure, resolution);
Set<Integer> communityCount = new HashSet<>();
int idx = 0;
for (Node n : hgraph.getNodes()) {
communityCount.add(comStructure[idx]);
n.setProperty("communityID", comStructure[idx++]);
}
return communityCount.size();
}