recursion pseudocode for backprop article

recursion.py

    def backprop(current_layer=1):
        if current_layer is output_layer:
            ∂_L = current_layer - labels
            current_layer.∆w = ∂_L * g'(Z(current_layer.nodes)) * (current_layer-1).nodes
            return ∂_L
        else:
            ∂_L = backprop(current_layer+1)
            ∂_L = ∂_L * g'(Z((current_layer+1).nodes)) * (current_layer+1).W
            current_layer.∆w = ∂_L * g'(Z(current_layer.nodes)) * (current_layer-1).nodes
            return ∂_L

    layers.W += layers.∆w