| 2022 | EMNLP | MCP: Self-supervised Pre-training for Personalized Chatbots with Multi-level Contrastive Sampling. | Zhaoheng Huang, Zhicheng Dou, Yutao Zhu, Zhengyi Ma |
| 2022 | WWW | Socialformer: Social Network Inspired Long Document Modeling for Document Ranking. | Yujia Zhou, Zhicheng Dou, Huaying Yuan, Zhengyi Ma |
| 2022 | SIGIR | Webformer: Pre-training with Web Pages for Information Retrieval. | Yu Guo, Zhengyi Ma, Jiaxin Mao, Hongjin Qian, Xinyu Zhang, Hao Jiang, Zhao Cao, Zhicheng Dou |
| 2021 | CIKM | Contrastive Learning of User Behavior Sequence for Context-Aware Document Ranking. | Yutao Zhu, Jian-Yun Nie, Zhicheng Dou, Zhengyi Ma, Xinyu Zhang, Pan Du, Xiaochen Zuo, Hao Jiang |
| 2021 | CIKM | Pre-training for Ad-hoc Retrieval: Hyperlink is Also You Need. | Zhengyi Ma, Zhicheng Dou, Wei Xu, Xinyu Zhang, Hao Jiang, Zhao Cao, Ji-Rong Wen |
| 2021 | SIGIR | One Chatbot Per Person: Creating Personalized Chatbots based on Implicit User Profiles. | Zhengyi Ma, Zhicheng Dou, Yutao Zhu, Hanxun Zhong, Ji-Rong Wen |
| 2020 | CIKM | PSTIE: Time Information Enhanced Personalized Search. | Zhengyi Ma, Zhicheng Dou, Guanyue Bian, Ji-Rong Wen |