PROOF 177
Prove.
Backpropagation is the chain rule
On composite functions.
Definition D1
For a function F of several variables, differentiating with respect to xᵢ while holding the remaining variables fixed is written ∂F/∂xᵢ. That is, lim (h→0) [F(…, xᵢ+h, …) − F(…, xᵢ, …)]/h.
Proof.
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