Unsupervised Corpus Aware Language Model Pre-training for Dense Passage Retrieval Luyu Gao author Jamie Callan author 2022-05 text Proceedings of the 60th Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers) Smaranda Muresan editor Preslav Nakov editor Aline Villavicencio editor Association for Computational Linguistics Dublin, Ireland conference publication gao-callan-2022-unsupervised 10.18653/v1/2022.acl-long.203 https://aclanthology.org/2022.acl-long.203/ 2022-05 2843 2853