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Shallow-to-deep Training For Neural Machine Translation

Bei Li, Ziyang Wang, Hui Liu, Yufan Jiang, Quan Du, Tong Xiao, Huizhen Wang, Jingbo Zhu . Proceedings of the 2020 Conference on Empirical Methods in Natural Language Processing (EMNLP) 2020 – 40 citations

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EMNLP Has Code Interdisciplinary Approaches Model Architecture Neural Machine Translation Training Techniques

Deep encoders have been proven to be effective in improving neural machine translation (NMT) systems, but training an extremely deep encoder is time consuming. Moreover, why deep models help NMT is an open question. In this paper, we investigate the behavior of a well-tuned deep Transformer system. We find that stacking layers is helpful in improving the representation ability of NMT models and adjacent layers perform similarly. This inspires us to develop a shallow-to-deep training method that learns deep models by stacking shallow models. In this way, we successfully train a Transformer system with a 54-layer encoder. Experimental results on WMT’16 English-German and WMT’14 English-French translation tasks show that it is (1.4) (\times) faster than training from scratch, and achieves a BLEU score of (30.33) and (43.29) on two tasks. The code is publicly available at https://github.com/libeineu/SDT-Training/.

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