1. Beijing Advanced Innovation Center for Big Data and Brain Computing, Beihang University, Beijing, China
2. College of Intelligence and Computing, Tianjin University, Tianjin, China
3. State Key Laboratory of Computer Architecture, Institute of Computing Technology, Chinese Academy of Sciences, Beijing, China
4. School of Computer Science and Engineering, Northwest Normal University, Lanzhou, China
5. Department of Computer Science and Mathematics, Sul Ross State University, Alpine, TX, USA