code: def _get_inv_param_transform(
      param_transform, inv_param_transform=None
  ):
      reg_inv_tf = TRANSFORM_REGISTRY.get(param_transform, None)
      if reg_inv_tf is None:
          if inv_param_transform is None:
              raise RuntimeError(
                  "Must specify inv_param_transform for custom param_transforms"
              )
          return inv_param_transform
      elif (
          inv_param_transform is not None
          and reg_inv_tf != inv_param_transform
      ):
          raise RuntimeError("TODO")
      return reg_inv_tf
  
label_desc: Use image node_id 3 for calling a global function with example usage: _get_inv_param_transform(param_transform, inv_param_transform) and returns: reg_inv_tf, inv_param_transform