שאלה | What is the "cache" used for in our implementation of forward propagation and backward propagation?

What is the "cache" used for in our implementation of forward propagation and backward propagation?

שאלה #17347

		It is used to cache the intermediate values of the cost function during training.
		We use it to pass variables computed during forward propagation to the corresponding backward propagation step. It contains useful values for backward propagation to compute derivatives.
		It is used to keep track of the hyperparameters that we are searching over, to speed up computation.
		We use it to pass variables computed during backward propagation to the corresponding forward propagation step. It contains useful values for forward propagation to compute activations.

the "cache" records values from the forward propagation units and sends it to the backward propagation units because it is needed to compute the chain rule derivatives.