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Example fundus images from the DDR dataset. (a) Healthy, which is labelled as class 0; (b) mild, which is labelled as class 1; (c) moderate, which is labelled as class 2; (d) severe, which is labelled as class 3; (e) proliferative, which is labelled as class 4; (f) ungradable, which is not up to quality standards to be used for model training and is labelled as class 5.
