code: def is_activated(self, images, augmenter, parents, default):
          
          if self.activator is None:
              return default
          else:
              return self.activator(images, augmenter, parents, default)
docs: Returns whether an augmenter may be executed.
  
          Returns
          -------
          bool
              If True, the augmenter may be executed. If False, it may not be executed.