code: def postprocess(self, images, augmenter, parents):
          
          if self.postprocessor is None:
              return images
          else:
              return self.postprocessor(images, augmenter, parents)
docs: A function to be called after the augmentation of images was
          performed.
  
          Returns
          -------
          (N,H,W,C) ndarray or (N,H,W) ndarray or list of (H,W,C) ndarray or list of (H,W) ndarray
              The input images, optionally modified.