1. School of Information Science and Technology, ShanghaiTech University 1 , Shanghai 201210, China
2. Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences 2 , Shanghai 200050, China
3. School of Optoelectronics, University of Chinese Academy of Sciences 3 , Beijing 100049, China
4. Shanghai Engineering Research Center of Energy Efficient and Custom AI IC, ShanghaiTech University 4 , Shanghai 201210, China
5. Virginia Tech, Virginia Tech Research Center in Arlington VA 5 , 900 N Glebe Rd, Arlington, Virginia 22203, USA