optimize comments
optimize comments

nudles/incubator-singa,apache/incubator-singa,apache/incubator-singa,apache/incubator-singa,nudles/incubator-singa,nudles/incubator-singa,apache/incubator-singa,apache/incubator-singa,nudles/incubator-singa,nudles/incubator-singa