1. School of Mathematics, Hangzhou Normal University, Hangzhou, China
2. College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou, China
3. School of Information Science and Engineering, Hangzhou Normal University, Hangzhou, China
4. School of Statistics, Jiangxi University of Finance and Economics, Nanchang, China
5. Research Institute of Hangzhou, Huawei Technologies Company Ltd, Hangzhou, China
6. School of Mathematical Sciences, Zhejiang University, Hangzhou, China