[1] School of Management and Economics, University of Electronic Science and Technology of China, Chengdu 610054, China
[2] Prediction Research Centre, University of Electronic Science and Technology of China, Chengdu 610054, China
[3] Finance Research of Center, Southwestern University of Finance and Economics, Chengdu 610054, China
[4] School of Applied Mathematics, University of Electronic Science and Technology of China, Chengdu 610054, China