1. Alibaba Group and the Alibaba-NTU Joint Research Institute, Nanyang Technological University, Jurong West, Singapore
2. School of Computer Science and Engineering, Nanyang Technological University, Jurong West, Singapore
3. Department of Electrical and Computer Engineering, University of British Columbia, Vancouver, Canada
4. Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon, South Korea
5. College of Computer Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, China
6. Institute for Infocomm Research, A*STAR, Fusionopolis, Singapore
7. Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, Canada