doudou-h

I believe layer_1_delta should be calculated below `layer_1_input = np.dot(layer_0,weights_0_1)` `layer_1_delta = layer_2_delta.dot(weights_1_2.T) * relu2deriv(layer_1_input)` instead of `layer_1 = relu(np.dot(layer_0,weights_0_1))` `layer_1_delta = layer_2_delta.dot(weights_1_2.T) * relu2deriv(layer_1)` even though they return the...