PAIR: Leveraging Passage-Centric Similarity Relation for Improving Dense Passage Retrieval Ruiyang Ren author Shangwen Lv author Yingqi Qu author Jing Liu author Wayne Xin Zhao author QiaoQiao She author Hua Wu author Haifeng Wang author Ji-Rong Wen author 2021-08 text Findings of the Association for Computational Linguistics: ACL-IJCNLP 2021 Chengqing Zong editor Fei Xia editor Wenjie Li editor Roberto Navigli editor Association for Computational Linguistics Online conference publication ren-etal-2021-pair 10.18653/v1/2021.findings-acl.191 https://aclanthology.org/2021.findings-acl.191/ 2021-08 2173 2183