1. Jiangsu Collaborative Innovation Center of Atmospheric, Environment and Equipment Technology (CICAEET), Nanjing University of Information Science and Technology, Nanjing 210044, P. R. China
2. School of Artificial Intelligence, Nanjing University of Information Science and Technology, Nanjing 210044, P. R. China
3. Collaborative Innovation Center of Memristive, Computing Application (CICMCA), Qilu Institute of Technology, Jinan 250200, P. R. China
4. Department of Physics, University of Wisconsin–Madison, Madison, WI 53706, USA