1. College of Information Science and Technology, Jinan University, Guangzhou, China
2. Department of Mathematics, The University of Hong Kong, Hong Kong, China
3. School of Computer, Guangdong University of Technology, Guangzhou, China
4. TCL Corporate Research Hong Kong, Hong Kong
5. College of Information Science and Technology, and Guangdong Key Lab of Traditional Chinese Medicine Information Technology, Jinan University, Guangzhou, China