[1] Univ Elect Sci & Technol China, Sch Informat & Software Engn, Chengdu 611731, Sichuan, Peoples R China
[2] Univ Waterloo, Dept Appl Math, Waterloo N2L 3G1, ON, Canada
[3] Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Chongqing 400714, Peoples R China
[4] Univ Elect Sci & Technol China, Sch Math Sci, Chengdu 611731, Sichuan, Peoples R China
[5] Chengdu Univ, Sch Informat Sci & Engn, Chengdu 610106, Sichuan, Peoples R China
[6] Guangxi Normal Univ, Coll Math & Stat, Guilin 541006, Peoples R China