[1] Tianjin Univ, Coll Intelligence & Comp, Tianjin, Peoples R China
[2] Univ Torino, Dept Comp Sci, Turin, Italy
[3] Pohang Univ Sci & Technol, Dept Comp Sci & Engn, Pohang, South Korea
[4] Beijing Univ Posts & Telecommun, Sch Comp Sci, Beijing, Peoples R China
[5] Univ Queensland, Sch Elect Engn & Comp Sci, Brisbane, Qld, Australia