[Huang, Gexin; Gu, Zheng Hui; Li, Yuanqing; Yu, Zhu Liang] South China Univ Technol, Sch Automat Sci & Engn, Guangzhou 510641, Peoples R China.
[Liu, Ke] Chongqing Univ Posts & Telecommun, Chongqing Key Lab Computat Intelligence, Chongqing 400065, Peoples R China.
[Liang, Jiawen] South China Univ Technol, Sch Intelligent Engn, Guangzhou 510641, Peoples R China.
[Cai, Chang] Cent China Normal Univ, Natl Engn Res Ctr E Learning, Wuhan 430079, Peoples R China.
[Qi, Feifei] Guangdong Univ Finance, Sch Internet Finance & Informat Engn, Guangzhou 510521, Peoples R China.