Multi-Class Confidence Weighted Algorithms Koby Crammer author Mark Dredze author Alex Kulesza author 2009-08 text Proceedings of the 2009 Conference on Empirical Methods in Natural Language Processing Philipp Koehn editor Rada Mihalcea editor Association for Computational Linguistics Singapore conference publication crammer-etal-2009-multi https://aclanthology.org/D09-1052/ 2009-08 496 504