MCP: Self-supervised Pre-training for Personalized Chatbots with Multi-level Contrastive Sampling Zhaoheng Huang author Zhicheng Dou author Yutao Zhu author Zhengyi Ma author 2022-12 text Findings of the Association for Computational Linguistics: EMNLP 2022 Yoav Goldberg editor Zornitsa Kozareva editor Yue Zhang editor Association for Computational Linguistics Abu Dhabi, United Arab Emirates conference publication huang-etal-2022-mcp 10.18653/v1/2022.findings-emnlp.73 https://aclanthology.org/2022.findings-emnlp.73/ 2022-12 1030 1042