code: def init_slab(self, slab=None, segmentation=None, voxelsize_mm=None, show_ok_button=False):
          
          self.segmentation = segmentation
          self.voxelsize_mm = voxelsize_mm
  
          from . import show_segmentation
          self.slab = show_segmentation.create_slab_from_segmentation(
              self.segmentation, slab=slab)
  
          if show_ok_button:
              ok_button = QPushButton("Ok")
              ok_button.clicked.connect(self._action_ok_button)
  
              self.superMainScrollLayout.addWidget(ok_button)
docs: Create widget with segmentation labels information used to select labels.
  
          :param slab: dict with label name and its id
          :param segmentation: 3D label ndarray
          :param voxelsize_mm: size of voxel in mm
          :return: