Autoencoder Backprop
Forward Pass
net_h = w1×x1 + w2×x2 h = sigmoid(net_h) net_o = w3×h o = sigmoid(net_o)
Backward Pass
δ_o = (target - o) × o×(1-o) δ_h = δ_o × w3 × h×(1-h)
Weight Update
Δw = η × δ × input_to_weight w_new = w_old + Δw + α×Δw_previous