graph = GraphIO.readUndirectedFromWeighted(
f, vertexLabels, opts.getDoubleOption('W'));
else
GraphIO.readUndirected(f, vertexLabels);
LinkClustering lc = new LinkClustering();
MultiMap<Integer,Integer> clusterToVertices =
lc.cluster(graph, System.getProperties());
PrintWriter pw = new PrintWriter(
new BufferedOutputStream(new FileOutputStream(
opts.getPositionalArg(1))));