1. Beijing Institute of Technology, Beijing, China
2. China Telecom Beijing Research Institute, Beijing, China
3. Shanghai AI Laboratory, Shanghai, China
4. State Key Laboratory of Multimodal Artificial Intelligence Systems, Institute of Automation, Chinese Academy of Sciences, Beijing, China
5. Institute of Big Data and Artificial Intelligence, China Telecom Beijing Research Institute, Beijing, China
6. School of Computer Science and Technology, Beijing Institute of Technology, Beijing, China