Table 4. SiaGEC model performance using multipass correction in two scenarios, numbers in bold refer to the largest values.

Model	Precision	Recall	F1 score	BLEU-4
SiaGEC L2R → SiaGEC R2L	81.21	66.34	73.03	84.13
SiaGEC R2L → SiaGEC L2R	82.17	67.00	73.81	85.33