class_docstr: This is a mixin class to support scalar -> RGBA mapping.  Handles
  normalization and colormapping
docstr: If mappable has changed since the last check,
  return True; else return False
docstr_tok: ["If","mappable","has","changed","since","the","last","check",",","return","True",";","else","return","False"]
code: def check_update(self, checker):
      """
      If mappable has changed since the last check,
      return True; else return False
      """
      if self.update_dict[checker]:
          self.update_dict[checker] = False
          return True
      return False
  
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 14 for calling the ScalarMappable obj's underlying member method code with example usage: obj.check_update(checker) and returns: False, True