Kazutaka Kinugawa
2021
NHK’s Lexically-Constrained Neural Machine Translation at WAT 2021
Hideya Mino
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Kazutaka Kinugawa
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Hitoshi Ito
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Isao Goto
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Ichiro Yamada
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Takenobu Tokunaga
Proceedings of the 8th Workshop on Asian Translation (WAT2021)
This paper describes the system of our team (NHK) for the WAT 2021 Japanese-English restricted machine translation task. In this task, the aim is to improve quality while maintaining consistent terminology for scientific paper translation. This task has a unique feature, where some words in a target sentence are given in addition to a source sentence. In this paper, we use a lexically-constrained neural machine translation (NMT), which concatenates the source sentence and constrained words with a special token to input them into the encoder of NMT. The key to the successful lexically-constrained NMT is the way to extract constraints from a target sentence of training data. We propose two extraction methods: proper-noun constraint and mistranslated-word constraint. These two methods consider the importance of words and fallibility of NMT, respectively. The evaluation results demonstrate the effectiveness of our lexical-constraint method.
2020
Neural Machine Translation Using Extracted Context Based on Deep Analysis for the Japanese-English Newswire Task at WAT 2020
Isao Goto
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Hideya Mino
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Hitoshi Ito
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Kazutaka Kinugawa
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Ichiro Yamada
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Hideki Tanaka
Proceedings of the 7th Workshop on Asian Translation
This paper describes the system of the NHK-NES team for the WAT 2020 Japanese–English newswire task. There are two main problems in Japanese-English news translation: translation of dropped subjects and compatibility between equivalent translations and English news-style outputs. We address these problems by extracting subjects from the context based on predicate-argument structures and using them as additional inputs, and constructing parallel Japanese-English news sentences equivalently translated from English news sentences. The evaluation results confirm the effectiveness of our context-utilization method.
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Co-authors
- Hideya Mino 2
- Hitoshi Ito 2
- Isao Goto 2
- Ichiro Yamada 2
- Takenobu Tokunaga 1
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