code: def set_seeds(self, seeds):
          
          if self.img.shape != seeds.shape:
              raise Exception("Seeds must be same size as input image")
  
          self.seeds = seeds.astype("int8")
          self.voxels1 = self.img[self.seeds == 1]
          self.voxels2 = self.img[self.seeds == 2]
docs: Function for manual seed setting. Sets variable seeds and prepares
          voxels for density model.
          :param seeds: ndarray (0 - nothing, 1 - object, 2 - background,
          3 - object just hard constraints, no model training, 4 - background 
          just hard constraints, no model training)