deeper dense layer.

def dense_to_deeper_block(dense_layer, weighted=True):
    '''deeper dense layer.
    '''
    units = dense_layer.units
    weight = np.eye(units)
    bias = np.zeros(units)
    new_dense_layer = StubDense(units, units)
    if weighted:
        new_dense_layer.set_weights(
            (add_noise(weight, np.array([0, 1])), add_noise(bias, np.array([0, 1])))
        )
    return [StubReLU(), new_dense_layer]