class_docstr: Selects one of the provided mutation based on a Choice subparameter
  Caution: there may be subparameter collisions
code: def _select(self) -> core.Layered:
      root = self.root()
      layers = {lay.uid: lay for lay in self._layers}
      layers["#ROOT#"] = root
      return layers[root.parameters["mutation_choice"].value]
  
imports: import typing
  import numpy
  from .None import core
  from .None import transforms
  from .data import Data, Scalar
  from .choice import Choice
  from .None import _layering
label_desc: Use image node_id 3 for calling the MutationChoice obj's underlying member method code with example usage: obj._select() and returns: layers