An open-source toolkit for word-level confidence estimation in machine translation Christophe Servan author Ngoc Tien Le author Ngoc Quang Luong author Benjamin Lecouteux author Laurent Besacier author 2015-dec 3-4 text Proceedings of the 12th International Workshop on Spoken Language Translation: Papers Marcello Federico editor Sebastian Stüker editor Jan Niehues editor Da Nang, Vietnam conference publication servan-etal-2015-open https://aclanthology.org/2015.iwslt-papers.11/ 2015-dec 3-4 196 203