1. Tsinghua University, Institute of Computing Technology, Chinese Academy of Sciences, Kexueyuan South Road, Beijing
2. Key Laboratory of Pervasive Computing, Ministry of Education, Beijing Key Lab of Networked Multimedia, Beijing National Research Center for Information Science and Technology, Department of Computer Science and Technology, Tsinghua University
3. Tsinghua University, UCLA
4. Global Innovation eXchange Institute, Key Laboratory of Pervasive Computing, Ministry of Education, Beijing Key Lab of Networked Multimedia, Department of Computer Science and Technology, Tsinghua University, Shuangqing Road, Beijing
5. Department of Electrical and Computing Engineering, Beihang University, Beijing
6. Tsinghua University, Shuangqing Road, Beijing