class_docstr: This is a mixin class to support scalar data to RGBA mapping.
  The ScalarMappable makes use of data normalization before returning
  RGBA colors from the given colormap.
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: from __future__ import absolute_import, division, print_function, unicode_literals
  import six
  import numpy
  from numpy import ma
  import matplotlib
  import matplotlib.colors
  import matplotlib.cbook
  from matplotlib._cm import datad
  from matplotlib._cm_listed import cmaps
label_desc: Use image node_id 13 for calling the ScalarMappable obj's underlying member method code with example usage: obj.check_update(checker) and returns: False, True