code: def encode_example(self, bbox):
      
      # Validate the coordinates
      for coordinate in bbox:
        if not isinstance(coordinate, float):
          raise ValueError(
              'BBox coordinates should be float. Got {}.'.format(bbox))
        if not 0.0 <= coordinate <= 1.0:
          raise ValueError(
              'BBox coordinates should be between 0 and 1. Got {}.'.format(bbox))
        if bbox.xmax < bbox.xmin or bbox.ymax < bbox.ymin:
          raise ValueError(
              'BBox coordinates should have min <= max. Got {}.'.format(bbox))
  
      return super(BBoxFeature, self).encode_example(
          [bbox.ymin, bbox.xmin, bbox.ymax, bbox.xmax]
      )
docs: See base class for details.