1. School of Computer Science and Technology, Guangdong University of Technology, Guangzhou, China
2. School of Automation, Guangdong University of Technology, Guangzhou, China
3. School of Information and Communication Engineering, Guangzhou Maritime University, Guangzhou, China
4. School of Integrated Circuits, Guangdong University of Technology, Guangzhou, China
5. Department of Computer Science, Swansea University, Swansea, U.K.
6. Faculty of Science and Engineering, School of Computer Science, University of Nottingham Ningbo China, Ningbo, China