Word Representation Models for Morphologically Rich Languages in Neural Machine Translation
Ekaterina Vylomova, Trevor Cohn, Xuanli He, Gholamreza Haffari
Abstract
Out-of-vocabulary words present a great challenge for Machine Translation. Recently various character-level compositional models were proposed to address this issue. In current research we incorporate two most popular neural architectures, namely LSTM and CNN, into hard- and soft-attentional models of translation for character-level representation of the source. We propose semantic and morphological intrinsic evaluation of encoder-level representations. Our analysis of the learned representations reveals that character-based LSTM seems to be better at capturing morphological aspects compared to character-based CNN. We also show that hard-attentional model provides better character-level representations compared to vanilla one.- Anthology ID:
- W17-4115
- Volume:
- Proceedings of the First Workshop on Subword and Character Level Models in NLP
- Month:
- September
- Year:
- 2017
- Address:
- Copenhagen, Denmark
- Editors:
- Manaal Faruqui, Hinrich Schuetze, Isabel Trancoso, Yadollah Yaghoobzadeh
- Venue:
- SCLeM
- SIG:
- Publisher:
- Association for Computational Linguistics
- Note:
- Pages:
- 103–108
- Language:
- URL:
- https://aclanthology.org/W17-4115
- DOI:
- 10.18653/v1/W17-4115
- Cite (ACL):
- Ekaterina Vylomova, Trevor Cohn, Xuanli He, and Gholamreza Haffari. 2017. Word Representation Models for Morphologically Rich Languages in Neural Machine Translation. In Proceedings of the First Workshop on Subword and Character Level Models in NLP, pages 103–108, Copenhagen, Denmark. Association for Computational Linguistics.
- Cite (Informal):
- Word Representation Models for Morphologically Rich Languages in Neural Machine Translation (Vylomova et al., SCLeM 2017)
- PDF:
- https://preview.aclanthology.org/nschneid-patch-4/W17-4115.pdf