1. Guangxi University,School of computer, electronic and information and Guangxi Key Laboratory of Multimedia Communications and Network Technology,Nanning,China
2. Guangxi University,School of computer, electronic and information,Nanning,China
3. Yulin Normal University,School of Computer Science and Engineering,Yulin,China
4. School of Computer Science and Control Engineering Shenzhen Institute of Advanced Technology,Shenzhen,China