Keras: calculating derivatives of model output wrt input returns [None]

Question

I need help with calculating derivatives for model output wrt inputs in Keras.

I want to add a regularization functional to the loss function. The regularizer conta

Answer 1

You are computing the gradients respect to X_train, which is not an input variable to the computation graph. Instead you need to get the symbolic input tensor to the model, so try something like:

grads = K.gradients(model.output, model.input)