1. School of Mathematical Sciences, University of Electronic Science and Technology of China, Chengdu, China
2. FinTech Innovation Center, Financial Intelligence and Financial Engineering Research Key Laboratory of Sichuan Province, School of Economic Information Engineering, Southwestern University of Finance and Economics, Chengdu, China
3. Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing, China
4. National Research Council-Institute of Methodologies for Environmental Analysis, CNR-IMAA, Tito Scalo, Italy