Improved grammatical error correction by ranking elementary edits
We offer a rescoring method for grammatical error correction which is based on two-stage procedure: the first stage model extracts local edits and the second classiifies them as correct or false. We show how to use an encoder-decoder or sequence labeling approach as the first stage of our model. We achieve state-of-the-art quality on BEA 2019 English dataset even with a weak BERT-GEC basic model. When using a state-of-the-art GECToR edit generator and the combined scorer, our model beats GECToR on BEA 2019 by $2-3\%$. Our model also beats previous state-of-the-art on Russian, despite using smaller models and less data than the previous approaches.
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