@Override
    public Iterator<KeyValue<Object, Double>> generateFinalResult(final Iterator<KeyValue<Object, Double>> keyValues) {
        return keyValues;
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/computer/ranking/pagerank/PageRankMapReduce.java