Architecture of the trained CNNs. The disc image is fed to the convolutional part of the neural network made of three blocks. Each of them consists of two convolutional layers with filter size 3 × 3 (light orange) followed by a max pooling layer with filter size 2 × 2 (dark orange). The second part of the CNN consists of two fully connected layers. We omit in this image the dropout and normalization layers.