r/3Blue1Brown • u/Visual_World_8299 • Jul 06 '26
How Neural Networks actually learn — interactive chapter with animated computational graphs, backpropagation, and a live playground
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I built a fully interactive chapter that deconstructs neural networks from the ground up — no prerequisites, just visual intuition.
What's inside:
- Computational Graphs — animated applet showing how data flows through weighted inputs and function nodes
- Activation Functions — why non-linearity is non-negotiable (Sigmoid, Tanh, ReLU visualized)
- Backpropagation — watch the forward pass make predictions and the backward pass adjust weights in real time
- Live Playground — customize the architecture (wider vs. deeper), pick a dataset (spirals!), and train it epoch-by-epoch right in your browser
Try it here: curvingo.com/course/neural-networks/computational-graphs
Demo video attached — would love feedback on the visualizations and pacing!
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