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Task 1: Non-referable (grade 0, 1) vs referable (grade 2, 3, 4) DR classification; Task 2: Normal (grade 0)/abnormal (grade 1–4) DR classification. DR: Diabetic retinopathy; PDR: Proliferative diabetic retinopathy; NPDR: Non-proliferative diabetic retinopathy; CFP: Color fundus photograph.
