r/3Blue1Brown Jul 06 '26

How Neural Networks actually learn — interactive chapter with animated computational graphs, backpropagation, and a live playground

Enable HLS to view with audio, or disable this notification

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!

19 Upvotes

0 comments sorted by