Uncertainty-Aware Semantic Augmentation for Neural Machine Translation

• URL: http://arxiv.org/abs/2010.04411v1
• Date: Fri, 9 Oct 2020 07:48:09 GMT
• Title: Uncertainty-Aware Semantic Augmentation for Neural Machine Translation
• Authors: Xiangpeng Wei and Heng Yu and Yue Hu and Rongxiang Weng and Luxi Xing and Weihua Luo
• Abstract summary: We propose uncertainty-aware semantic augmentation, which explicitly captures the universal semantic information among multiple semantically-equivalent source sentences. Our approach significantly outperforms the strong baselines and the existing methods.
• Score: 37.555675157198145
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: As a sequence-to-sequence generation task, neural machine translation (NMT) naturally contains intrinsic uncertainty, where a single sentence in one language has multiple valid counterparts in the other. However, the dominant methods for NMT only observe one of them from the parallel corpora for the model training but have to deal with adequate variations under the same meaning at inference. This leads to a discrepancy of the data distribution between the training and the inference phases. To address this problem, we propose uncertainty-aware semantic augmentation, which explicitly captures the universal semantic information among multiple semantically-equivalent source sentences and enhances the hidden representations with this information for better translations. Extensive experiments on various translation tasks reveal that our approach significantly outperforms the strong baselines and the existing methods.

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