Abstract
Unsupervised cross-lingual word embedding(CLWE) methods learn a linear transformation matrix that maps two monolingual embedding spaces that are separately trained with monolingual corpora. This method relies on the assumption that the two embedding spaces are structurally similar, which does not necessarily hold true in general. In this paper, we argue that using a pseudo-parallel corpus generated by an unsupervised machine translation model facilitates the structural similarity of the two embedding spaces and improves the quality of CLWEs in the unsupervised mapping method. We show that our approach outperforms other alternative approaches given the same amount of data, and, through detailed analysis, we show that data augmentation with the pseudo data from unsupervised machine translation is especially effective for mapping-based CLWEs because (1) the pseudo data makes the source and target corpora (partially) parallel; (2) the pseudo data contains information on the original language that helps to learn similar embedding spaces between the source and target languages.- Anthology ID:
- 2021.acl-srw.17
- Volume:
- Proceedings of the 59th Annual Meeting of the Association for Computational Linguistics and the 11th International Joint Conference on Natural Language Processing: Student Research Workshop
- Month:
- August
- Year:
- 2021
- Address:
- Online
- Editors:
- Jad Kabbara, Haitao Lin, Amandalynne Paullada, Jannis Vamvas
- Venues:
- ACL | IJCNLP
- SIG:
- Publisher:
- Association for Computational Linguistics
- Note:
- Pages:
- 163–173
- Language:
- URL:
- https://aclanthology.org/2021.acl-srw.17
- DOI:
- 10.18653/v1/2021.acl-srw.17
- Cite (ACL):
- Sosuke Nishikawa, Ryokan Ri, and Yoshimasa Tsuruoka. 2021. Data Augmentation with Unsupervised Machine Translation Improves the Structural Similarity of Cross-lingual Word Embeddings. In Proceedings of the 59th Annual Meeting of the Association for Computational Linguistics and the 11th International Joint Conference on Natural Language Processing: Student Research Workshop, pages 163–173, Online. Association for Computational Linguistics.
- Cite (Informal):
- Data Augmentation with Unsupervised Machine Translation Improves the Structural Similarity of Cross-lingual Word Embeddings (Nishikawa et al., ACL-IJCNLP 2021)
- PDF:
- https://preview.aclanthology.org/ingest-2024-clasp/2021.acl-srw.17.pdf
- Data
- MLDoc, XNLI