Biomedical imaging 1 Computational modeling 1 Convolutional neural networks 1 Diabetes 1 Diabetic retinopathy 1 Feature extraction 1 Neural networks 1 Retina 1 Transfer learning 1 augmentation 1 convolutional neural network 1 image preprocessing 1 k-fold cross validation 1 model optimization 1 multi-class classification 1 retinal fundus images 1 transfer learning models