← LABS Neural Network Playground REAL BACKPROP · FROM SCRATCH
Dataset
Features (input)
Training
Live metrics
Epoch0
Train loss
Test loss
Train acc
Test acc
Parameters
First-layer neurons
Each thumbnail is what one hidden neuron has learned to detect — its own decision surface. The output is a learned combination of them. This is a genuine MLP: forward pass, cross-entropy loss, and backpropagation are all computed here, in the browser, per step.