[Liu, Hui] Cent China Normal Univ, Sch Comp Sci, Wuhan 430079, Peoples R China.
[Liu, Hui] Cent China Normal Univ, Hubei Prov Key Lab Artificial Intelligence & Smart, Wuhan 430079, Peoples R China.
[Guo, Jiabao; Zhao, Bo] Wuhan Univ, Sch Cyber Sci & Engn, Wuhan 430072, Peoples R China.
[Zhang, Kehuan] Chinese Univ Hong Kong, Coll Informat Engn, Hong Kong 999077, Peoples R China.
[Liu, Peng] Penn State Univ, Coll Informat Sci & Technol, State Coll, PA 16801 USA.