https://aclanthology.org/2020.findings-emnlp.174/
PTUM: Pre-training User Model from Unlabeled User Behaviors via Self-supervision - ACL Anthology
Chuhan Wu, Fangzhao Wu, Tao Qi, Jianxun Lian, Yongfeng Huang, Xing Xie. Findings of the Association for Computational Linguistics: EMNLP 2020. 2020.