code: def _select_labels(self, segmentation, labels=None):
          
  
          logger.debug("select_labels() started with labels={}".format(labels))
          if self.slab is not None and labels is not None:
              segmentation_out = select_labels(segmentation, labels, slab=self.slab)
          else:
              logger.warning("Nothing found for labels " + str(labels))
              un = np.unique(segmentation)
              if len(un) < 2:
                  logger.error("Just one label found in input segmenation")
              segmentation_out = (segmentation > un[0]).astype(segmentation.dtype)
          return segmentation_out
docs: Get selection of labels from input segmentation
  
          :param segmentation:
          :param labels:
          :return: