@SuppressWarnings("unchecked")
        @Override
        public CloneVertexProgram create(final Graph graph) {
            return (CloneVertexProgram) VertexProgram.createVertexProgram(graph, configuration);
        }
@author Daniel Kuppitz (http://gremlin.guru)
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/computer/clone/CloneVertexProgram.java