@Override
    @SuppressWarnings("CloneDoesntCallSuperClone,CloneDoesntDeclareCloneNotSupportedException")
    public StaticVertexProgram<M> clone() {
        return this;
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/computer/util/StaticVertexProgram.java