Elon Musk reposted
Tom Yeh
@ProfTomYeh
Backpropagation by hand ✍️ ~ 11 steps walkthrough below
Backpropagation is the algorithm that actually trains a neural network, and it is where most people stop following along. It is not calculus you cannot do. It is matrix multiplication, working backward, one layer at a time.
02:15 PM · July 20, 2026 · 0 views
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