Multi-stage Training with Improved Negative Contrast for Neural Passage Retrieval Jing Lu author Gustavo Hernandez Abrego author Ji Ma author Jianmo Ni author Yinfei Yang author 2021-11 text Proceedings of the 2021 Conference on Empirical Methods in Natural Language Processing Marie-Francine Moens editor Xuanjing Huang editor Lucia Specia editor Scott Wen-tau Yih editor Association for Computational Linguistics Online and Punta Cana, Dominican Republic conference publication lu-etal-2021-multi 10.18653/v1/2021.emnlp-main.492 https://aclanthology.org/2021.emnlp-main.492/ 2021-11 6091 6103