Optimal Transport for Unsupervised Hallucination Detection in Neural Machine Translation Nuno M Guerreiro author Pierre Colombo author Pablo Piantanida author André Martins author 2023-07 text Proceedings of the 61st Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers) Anna Rogers editor Jordan Boyd-Graber editor Naoaki Okazaki editor Association for Computational Linguistics Toronto, Canada conference publication guerreiro-etal-2023-optimal 10.18653/v1/2023.acl-long.770 https://aclanthology.org/2023.acl-long.770/ 2023-07 13766 13784