1. College of Electronics and Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China
2. Department of Computer Science and Engineering, University of South Florida, Tampa, FL, USA
3. School of Integrated Circuit Science and Engineering, Beijing Advanced Innovation Center for Big Data and Brain Computing, Fert Beijing Research Institute, Beihang University, Beijing, China
4. Institute of Computing Technology, Chinese Academy of Sciences, Beijing, China
5. Department of Electrical and Computer Engineering, Northeastern University, Boston, MA, USA
6. Department of Computer Science and Engineering, University of Notre Dame, Notre Dame, IN, USA