Results of the WMT20 Metrics Shared Task

Nitika Mathur, Johnny Wei, Markus Freitag, Qingsong Ma, Ondřej Bojar


Abstract
This paper presents the results of the WMT20 Metrics Shared Task. Participants were asked to score the outputs of the translation systems competing in the WMT20 News Translation Task with automatic metrics. Ten research groups submitted 27 metrics, four of which are reference-less “metrics”. In addition, we computed five baseline metrics, including sentBLEU, BLEU, TER and using the SacreBLEU scorer. All metrics were evaluated on how well they correlate at the system-, document- and segment-level with the WMT20 official human scores. We present an extensive analysis on influence of different reference translations on metric reliability, how well automatic metrics score human translations, and we also flag major discrepancies between metric and human scores when evaluating MT systems. Finally, we investigate whether we can use automatic metrics to flag incorrect human ratings.
Anthology ID:
2020.wmt-1.77
Volume:
Proceedings of the Fifth Conference on Machine Translation
Month:
November
Year:
2020
Address:
Online
Editors:
Loïc Barrault, Ondřej Bojar, Fethi Bougares, Rajen Chatterjee, Marta R. Costa-jussà, Christian Federmann, Mark Fishel, Alexander Fraser, Yvette Graham, Paco Guzman, Barry Haddow, Matthias Huck, Antonio Jimeno Yepes, Philipp Koehn, André Martins, Makoto Morishita, Christof Monz, Masaaki Nagata, Toshiaki Nakazawa, Matteo Negri
Venue:
WMT
SIG:
SIGMT
Publisher:
Association for Computational Linguistics
Note:
Pages:
688–725
Language:
URL:
https://aclanthology.org/2020.wmt-1.77
DOI:
Bibkey:
Cite (ACL):
Nitika Mathur, Johnny Wei, Markus Freitag, Qingsong Ma, and Ondřej Bojar. 2020. Results of the WMT20 Metrics Shared Task. In Proceedings of the Fifth Conference on Machine Translation, pages 688–725, Online. Association for Computational Linguistics.
Cite (Informal):
Results of the WMT20 Metrics Shared Task (Mathur et al., WMT 2020)
Copy Citation:
PDF:
https://aclanthology.org/2020.wmt-1.77.pdf
Data
WMT 2020