Improving automatic Chinese-Japanese patent translation using bilingual term extraction

Wei Yang*, Yves Lepage

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The identification of terms in scientific and patent documents is a crucial issue for applications like information retrieval, text categorization, and also for machine translation. This paper describes a method to improve Chinese-Japanese statistical machine translation of patents by re-tokenizing the training corpus with aligned bilingual multi-word terms. We automatically extract multi-word terms from monolingual corpora by combining statistical and linguistic filtering methods. An automatic alignment method is used to identify corresponding terms. The most promising bilingual multi-word terms are extracted by setting some threshold on translation probabilities and further filtering by considering the components of the bilingual multi-word terms in characters as well as the ratio of their lengths in words. We also use kanji (Japanese)-hanzi (Chinese) character conversion to confirm and extract more promising bilingual multi-word terms. We obtain a high quality of correspondence with 93% in bilingual term extraction and a significant improvement of 1.5 BLEU score in a translation experiment.

Original languageEnglish
JournalIEEJ Transactions on Electrical and Electronic Engineering
Publication statusAccepted/In press - 2017


  • Alignment
  • Bilingual term
  • Monolingual term
  • Statistical machine translation
  • Term extraction

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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