def inverse_norm(x, unit=1.0, order=1):
    """
  The simple inverse function: z(x) = 1.0 / x

  Args:
    x: Union[float, np.ndarray] as the inputs to scale.
    unit: a dummy variable.
    order: a dummy variable.

  Returns:
    z: the inversed inputs.

  """
    return 1.0 / x
