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Backpropagation Step-by-Step

Visualize forward and backward passes through a simple 2-1-1 neural network

How to Use

Set input values x1, x2 and a target y. Click "Forward Pass" to see activations propagate, then "Backward Pass" to see gradients flow back. "Train 1 Epoch" does both and updates weights. Watch the loss decrease over epochs.

Network State

Epoch0
Loss (MSE)-
Output a_out-
Click "Forward Pass" to begin...