Backpropagation Is Just Dynamic Programming (I Animated It to Prove It)

Everyone learns backpropagation as "apply the chain rule. " Almost nobody explains why it's fast — and that "why" is the whole reason deep learning is computationally possible at all. So I animated one full training step to show the part most explanations skip.

Source: [Dev.to](https://dev.to/amargul/backpropagation-is-just-dynamic-programming-i-animated-it-to-prove-it-4jhj)