code: def _hash_bbox(self, object):
      num_list = [object["category"]] + object["bbox"]
      return "_".join([str(num) for num in num_list])
  
file_path: dgl/examples/mxnet/scenegraph/data/relation.py
imports: from __future__ import absolute_import, division
  import json
  import logging
  import os
  import pickle
  import warnings
  from collections import Counter
  import dgl
  import mxnet
  import numpy
  from gluoncv.data.base import VisionDataset
  from gluoncv.data.transforms.presets.rcnn import FasterRCNNDefaultTrainTransform, FasterRCNNDefaultValTransform
label_desc: Use image node_id 3 for calling the VGRelation obj's underlying member method code with example usage: obj._hash_bbox(object) and returns: str