code: def ensure_rng(rng=None):
      """Coerces input into a random number generator.
  
      If the input is None, then a global random state is returned.
  
      If the input is a numeric value, then that is used as a seed to construct a
      random state. Otherwise the input is returned as-is.
  
      Adapted from [1]_.
  
      Args:
          rng (int | numpy.random.RandomState | None):
              if None, then defaults to the global rng. Otherwise this can be an
              integer or a RandomState class
      Returns:
          (numpy.random.RandomState) : rng -
              a numpy random number generator
  
      References:
          .. [1] https://gitlab.kitware.com/computer-vision/kwarray/blob/master/kwarray/util_random.py#L270  # noqa: E501
      """
  
      if rng is None:
          rng = np.random.mtrand._rand
      elif isinstance(rng, int):
          rng = np.random.RandomState(rng)
      else:
          rng = rng
      return rng
  
label_desc: Use image node_id 1 for calling a global function with example usage: ensure_rng(rng) and returns: rng