ULN: Towards Underspecified Vision-and-Language Navigation Weixi Feng author Tsu-Jui Fu author Yujie Lu author William Yang Wang author 2022-12 text Proceedings of the 2022 Conference on Empirical Methods in Natural Language Processing Yoav Goldberg editor Zornitsa Kozareva editor Yue Zhang editor Association for Computational Linguistics Abu Dhabi, United Arab Emirates conference publication feng-etal-2022-uln 10.18653/v1/2022.emnlp-main.429 https://aclanthology.org/2022.emnlp-main.429/ 2022-12 6394 6412