I see. So in the first time we backward, in the gradient argument it is naturally desired USUALLY one/s.
@albanD, so correct if I wrong the gradient argument is useful, suppose in any situation when I calculated the gradient somehow manually for example, and now I want to continue with the gradient calculation, it is kind a manual hook to do back propagation, but usually the desired behavior is putting value/vector/matrix of ones ?
Any other scenarios of necessity of this argument and it’s use will be great to look at and understand it better, thank you.