code: def bool_mask(self):
      return self.decode_bool_mask(self._mask)
  
imports: import copy
  from typing import Dict, List, Optional
  import numpy
  from sahi.utils.coco import CocoAnnotation, CocoPrediction
  from sahi.utils.cv import get_bbox_from_bool_mask, get_bool_mask_from_coco_segmentation, get_coco_segmentation_from_bool_mask
  from sahi.utils.shapely import ShapelyAnnotation
label_desc: Use image node_id 6 for calling the Mask obj's underlying member method code with example usage: obj.bool_mask() and returns: self