Key Lab of Intelligent Information Processing, Institute of Computing Technology, Chinese Academy of Sciences, 6, Kexueyuan South Road, Zhongguancun, Beijing, 100190, China. wangyaojun@ict.ac.cn.|Key Lab of Intelligent Information Processing, Institute of Computing Technology, Chinese Academy of Sciences, 6, Kexueyuan South Road, Zhongguancun, Beijing, 100190, China. yangfei@ict.ac.cn.|Institute of Biophysics, Chinese Academy of Sciences, 15, Datun Road, Chaoyang District, Beijing, 100101, China. wupeng@moon.ibp.ac.cn.|Key Lab of Intelligent Information Processing, Institute of Computing Technology, Chinese Academy of Sciences, 6, Kexueyuan South Road, Zhongguancun, Beijing, 100190, China. dbu@ict.ac.cn.|Key Lab of Intelligent Information Processing, Institute of Computing Technology, Chinese Academy of Sciences, 6, Kexueyuan South Road, Zhongguancun, Beijing, 100190, China. dwsun@ict.ac.cn.