Unsupervised Word Alignment Using Frequency Constraint in Posterior Regularized EM Hidetaka Kamigaito author Taro Watanabe author Hiroya Takamura author Manabu Okumura author 2014-10 text Proceedings of the 2014 Conference on Empirical Methods in Natural Language Processing (EMNLP) Alessandro Moschitti editor Bo Pang editor Walter Daelemans editor Association for Computational Linguistics Doha, Qatar conference publication kamigaito-etal-2014-unsupervised 10.3115/v1/D14-1017 https://aclanthology.org/D14-1017/ 2014-10 153 158