Abstract
An inherent weakness of neural machine translation (NMT) systems is their inability to correctly translate unknown words. Traditional unknown words processing methods are usually based on word vectors trained on large scale of monolingual corpus. Replacing the unknown words according to the similarity of word vectors. However, it suffers from two weaknesses: Firstly, the resulting vectors of unknown words are not of high quality; Secondly, it is difficult to deal with polysemous words. This paper proposes an unknown word processing method by integrating HowNet. Using the concepts and sememes in HowNet to seek the replacement words of unknown words. Experimental results show that our proposed method can not only improves the performance of NMT, but also provides some advantages compared with the traditional unknown words processing methods.
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