Fig. 1. Examples of different activations of feature layers. (a) Example of fully activated neurons; (b) example of insufficient activation of neurons; (c) example of full activation of deep layer neurons

Fig. 2. Flow chart of image feature measurement algorithm based on information entropy

Fig. 3. Feature purity of each feature layer of ResNet18 and VGG19 under different thresholds. (a) ResNet18; (b) VGG19

Fig. 4. Comparison of Grad-CAM and feature purity of ResNet18 feature layer of different types of images in CIFAR10 dataset

Fig. 5. Comparison of feature activation maps and feature purity of feature layers on ImageNet1000 for models with different performance

Fig. 6. Comparison of Grad-CAM and feature purity of last feature layer under different epochs of Tiny VGG

Fig. 7. Comparison of Grad-CAM and feature purity of last feature layer of ResNet18 model under different epochs