PTUM: Pre-training User Model from Unlabeled User Behaviors via Self-supervision Chuhan Wu author Fangzhao Wu author Tao Qi author Jianxun Lian author Yongfeng Huang author Xing Xie author 2020-11 text Findings of the Association for Computational Linguistics: EMNLP 2020 Trevor Cohn editor Yulan He editor Yang Liu editor Association for Computational Linguistics Online conference publication wu-etal-2020-ptum 10.18653/v1/2020.findings-emnlp.174 https://aclanthology.org/2020.findings-emnlp.174/ 2020-11 1939 1944