CUNI at WMT25 General Translation Task

Josef Jon, Miroslav Hrabal, Martin Popel, Ondřej Bojar


Abstract
This paper describes the CUNI submissions to the WMT25 General Translation task, namely for the English to Czech, English to Serbian, Czech to German and Czech to Ukrainian language pairs. We worked in multiple teams, each with a different approach, spanning from traditional, smaller Transformer NMT models trained on both sentence and document level, to fine-tuning LLMs using LoRA and CPO. We show that these methods are effective in improving automatic MT evaluation scores compared to the base pretrained models.
Anthology ID:
2025.wmt-1.44
Volume:
Proceedings of the Tenth Conference on Machine Translation
Month:
November
Year:
2025
Address:
Suzhou, China
Editors:
Barry Haddow, Tom Kocmi, Philipp Koehn, Christof Monz
Venue:
WMT
SIG:
Publisher:
Association for Computational Linguistics
Note:
Pages:
680–687
Language:
URL:
https://preview.aclanthology.org/ingest-emnlp/2025.wmt-1.44/
DOI:
Bibkey:
Cite (ACL):
Josef Jon, Miroslav Hrabal, Martin Popel, and Ondřej Bojar. 2025. CUNI at WMT25 General Translation Task. In Proceedings of the Tenth Conference on Machine Translation, pages 680–687, Suzhou, China. Association for Computational Linguistics.
Cite (Informal):
CUNI at WMT25 General Translation Task (Jon et al., WMT 2025)
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PDF:
https://preview.aclanthology.org/ingest-emnlp/2025.wmt-1.44.pdf