Three-phase training to address data sparsity in Neural Machine Translation Ruchit Agrawal author Mihir Shekhar author Dipti Sharma author 2017-12 text Proceedings of the 14th International Conference on Natural Language Processing (ICON-2017) Sivaji Bandyopadhyay editor NLP Association of India Kolkata, India conference publication agrawal-etal-2017-three https://aclanthology.org/W17-7503/ 2017-12 13 22