[Xu, Chao;Wang, Jianxin;Yang, Yongjie] Cent South Univ, Sch Comp Sci & Engn, Changsha, Peoples R China.^[Li, Wenjun] Changsha Univ Sci & Technol, Hunan Prov Key Lab Intelligent Proc Big Data Tran, Changsha, Peoples R China.^[Yang, Yongjie] Saarland Univ, Econ Theory, Saarbrucken, Germany.