class_docstr: A mixin class to map scalar data to RGBA.
  
  The ScalarMappable applies data normalization before returning RGBA colors
  from the given colormap.
docstr: Call this whenever the mappable is changed to notify all the
  callbackSM listeners to the 'changed' signal.
docstr_tok: ["Call","this","whenever","the","mappable","is","changed","to","notify","all","the","callbackSM","listeners","to","the","'changed","'","signal","."]
code: def changed(self):
      """
      Call this whenever the mappable is changed to notify all the
      callbackSM listeners to the 'changed' signal.
      """
      self.callbacks.process("changed", self)
      self.stale = True
  
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 16 for calling the ScalarMappable obj's underlying member method code with example usage: obj.changed() without return types