Selecting Parallel In-domain Sentences for Neural Machine Translation Using Monolingual Texts

Research output: Contribution to journalArticleScientificpeer-review


Continuously-growing data volumes lead to larger generic models. Specific use-cases are usually left out, since generic models tend to perform poorly in domain-specific cases. Our work addresses this gap with a method for selecting in-domain data from generic-domain (parallel text) corpora, for the task of machine translation. The proposed method ranks sentences in parallel general-domain data according to their cosine similarity with a monolingual domain-specific data set. We then select the top K sentences with the highest similarity score to train a new machine translation system tuned to the specific in-domain data. Our experimental results show that models trained on this in-domain data outperform models trained on generic or a mixture of generic and domain data. That is, our method selects high-quality domain-specific training instances at low computational cost and data size.
Original languageEnglish
Pages (from-to)213-230
Number of pages18
JournalComputational Linguistics in the Netherlands Journal
Publication statusPublished - Dec 2021


  • Machine Translation
  • Data Selection
  • In-domain Translation


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