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The number of samples per training dataset. BO: balanced original dataset; BS: balanced synthesized dataset; IO: balanced original dataset; IOA: imbalanced original dataset with traditional augmentation; IOFS: Imbalanced original dataset fully augmented with synthesized images; IOPS: imbalanced original dataset partly augmented with synthesized images; E: early keratoconus images; K: keratoconus images; N: normal cornea images.
