1. Gongniu Group Co Ltd, Ningbo, P. R. China
2. School of Computing and Data Engineering, NingboTech University, Ningbo, P. R. China
3. Ningbo Institute, Zhejiang University, Ningbo, P. R. China
4. School of Computer Science, Chongqing University, Chongqing, P. R. China
5. Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, P. R. China