Figure 4 shows that when the size of training dataset is fixed (=40k), different proportions of P-style and V-style errors achieve different F1 scores, denoting that the proportion of P-style and V-style spelling errors affects the quality of the generated corpus.
it is observed that a 4:6 proportion of D-ocr and Dasr achieves the best performance on three testing datasets when compared with other proportion ratios.