基金This work was partially supported by the National Natural Science Foundation for Outstanding Excellent Young Scholars of China under Grant No. 61422214, the National Natural Science Foundation of China under Grant Nos. 61402513, 61379144, and 61772544, the National Basic Research 973 Program of China under Grant No. 2014CB347800, the Hunan Provincial Natural Science Fund for Distinguished Young Scholars of China under Grant No. 2016JJ1002, the Natural Science Foundation of Guangxi Zhuang Autonomous Region of China under Grant No. 2016GXNSFBA380182, the Guangxi Cooperative Innovation Center of Cloud Computing and Big Data under Grant Nos. YD16507 and YD17X11, and the Scientific Research Foundation of Guangxi University under Grant Nos. XGZ150322 and XGZ141182.