1. College of Information Science and Engineering Huaqiao University Xiamen China
2. College of Computer Science and Engineering Nanjing University of Science and Technology Nanjing China
3. College of Engineering Huaqiao University Quanzhou China
4. Xiamen Yealink Network Technology Company Limited No. 666, Hu'an Road, High‐tech Park, Huli District Xiamen Fujian China
5. School of Computer and Communication Engineering University of Science and Technology Beijing Beijing China
6. National Laboratory of Pattern Recognition Institute of Automation Chinese Academy of Sciences Beijing China