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Sometimes, you see a diagram and it gives you an ‘aha ha’ moment. Here is one representing forward propagation and back propagation in a neural network:

A brief explanation is:

- Using the input variables x and y, The forwardpass (left half of the figure) calculates output z as a function of x and y i.e. f(x,y)
- The right side of the figures shows the backwardpass.
- Receiving dL/dz (the derivative of the total loss with respect to the output z) , we can calculate the individual gradients of x and y on the loss function by applying the chain rule, as shown in the figure.

A more detailed explanation below from me.

*Read full article here. *

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