code: def to_bounding_box(self):
          
          from .bbs import BoundingBox
          # we don't have to mind the case of len(.) == 1 here, because
          # zero-sized BBs are considered valid
          if len(self.coords) == 0:
              return None
          return BoundingBox(x1=np.min(self.xx), y1=np.min(self.yy),
                             x2=np.max(self.xx), y2=np.max(self.yy),
                             label=self.label)
docs: Generate a bounding box encapsulating the line string.
  
          Returns
          -------
          None or imgaug.augmentables.bbs.BoundingBox
              Bounding box encapsulating the line string.
              ``None`` if the line string contained no points.