[Bai, Jun;Sajjanhar, Atul;Xiang, Yong] Deakin Univ, Sch Informat Technol, Geelong, Vic, Australia.^[Tong, Xiaojun] Wuhan Text Univ, Sch Comp Sci & Artificial Intelligence, Wuhan, Peoples R China.^[Zeng, Shan] Wuhan Polytech Univ, Sch Math & Comp Sci, Wuhan, Peoples R China.