CometKiwi: IST-Unbabel 2022 Submission for the Quality Estimation Shared Task. (arXiv:2209.06243v1 [cs.CL])

We present the joint contribution of IST and Unbabel to the WMT 2022 Shared
Task on Quality Estimation (QE). Our team participated on all three subtasks:
(i) Sentence and Word-level Quality Prediction; (ii) Explainable QE; and (iii)
Critical Error Detection. For all tasks we build on top of the COMET framework,
connecting it with the predictor-estimator architecture of OpenKiwi, and
equipping it with a word-level sequence tagger and an explanation extractor.
Our results suggest that incorporating references during pretraining improves …

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