1. Department of Interactive Media, Hong Kong Baptist University, Kowloon Tsai, Hong Kong
2. School of Computer Science, Nanjing University of Posts and Telecommunications, Nanjing, China
3. State Key Laboratory of Multimodal Artificial Intelligence Systems, Institute of Automation, Beijing, CAS, China
4. Department of Computer Science, The University of Hong Kong, Pokfulam, Hong Kong
5. Department of Journalism, Hong Kong Baptist University, Kowloon Tsai, Hong Kong