class_docstr: This is a mixin class to support scalar -> RGBA mapping.  Handles
  normalization and colormapping
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.callbacksSM.process("changed", self)
  
      for key in self.update_dict:
          self.update_dict[key] = True
  
imports: import numpy
  from numpy import ma
  import matplotlib
  import matplotlib.colors
  import matplotlib.cbook
  from matplotlib._cm import *
label_desc: Use image node_id 15 for calling the ScalarMappable obj's underlying member method code with example usage: obj.changed() without return types