1. School of Computer Science, Guangdong University of Technology, Guangzhou, China
2. School of Electrical and Information Engineering, Jiangsu University, Zhenjiang, China
3. Department of Computer Science and the Brain Mind Institute, University of Western Ontario, London, ON, Canada
4. Department of Computer Science and Engineering, Shanghai Jiao Tong University, Shanghai, China
5. School of Computer Science and Engineering, South China University of Technology, Guangzhou, Guangdong, China