The LMU Munich Systems for the WMT21 Unsupervised and Very Low-Resource Translation Task

Jindřich Libovický, Alexander Fraser


Abstract
We present our submissions to the WMT21 shared task in Unsupervised and Very Low Resource machine translation between German and Upper Sorbian, German and Lower Sorbian, and Russian and Chuvash. Our low-resource systems (German↔Upper Sorbian, Russian↔Chuvash) are pre-trained on high-resource pairs of related languages. We fine-tune those systems using the available authentic parallel data and improve by iterated back-translation. The unsupervised German↔Lower Sorbian system is initialized by the best Upper Sorbian system and improved by iterated back-translation using monolingual data only.
Anthology ID:
2021.wmt-1.105
Volume:
Proceedings of the Sixth Conference on Machine Translation
Month:
November
Year:
2021
Address:
Online
Venues:
EMNLP | WMT
SIG:
SIGMT
Publisher:
Association for Computational Linguistics
Note:
Pages:
989–994
Language:
URL:
https://aclanthology.org/2021.wmt-1.105
DOI:
Bibkey:
Cite (ACL):
Jindřich Libovický and Alexander Fraser. 2021. The LMU Munich Systems for the WMT21 Unsupervised and Very Low-Resource Translation Task. In Proceedings of the Sixth Conference on Machine Translation, pages 989–994, Online. Association for Computational Linguistics.
Cite (Informal):
The LMU Munich Systems for the WMT21 Unsupervised and Very Low-Resource Translation Task (Libovický & Fraser, WMT 2021)
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PDF:
https://preview.aclanthology.org/update-css-js/2021.wmt-1.105.pdf