GradCAM

Learn about gradient-weighted CAMs that use gradients for generating visualizations.

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Gradient-weighted CAM

A gradient-weighted CAM or Grad-CAM is another class activation map algorithm that uses the gradients of the predicted class propagating into the final convolutional layer to weigh the feature maps used for creating maps.

Let's assume that FlRh×w\mathcal{F}_l \in \R^{h \times w} is the lthl^{th} feature map obtained from the penultimate convolutional layer (hh ...