class_docstr: A mixin class to map scalar data to RGBA.
  
  The ScalarMappable applies data normalization before returning RGBA colors
  from the given colormap.
code: def norm(self):
      return self._norm
  
imports: from collections.abc import Mapping
  import functools
  import numpy
  from numpy import ma
  import matplotlib
  from matplotlib import _api, colors, cbook, scale
  from matplotlib._cm import datad
  from matplotlib._cm_listed import cmaps
label_desc: Use image node_id 11 for calling the ScalarMappable obj's underlying member method code with example usage: obj.norm() and returns: self