class_docstr: encode the bounding boxes
class_docstr_tok: ["encode","the","bounding","boxes"]
code: def __init__(self):
      super(EdgeBBoxExtend, self).__init__()
  
imports: import pickle
  import dgl
  import gluoncv
  import mxnet
  import numpy
  from dgl.nn.mxnet import GraphConv
  from dgl.utils import toindex
  from mxnet import nd
  from mxnet.gluon import nn
label_desc: Use image node_id 1 to create a new EdgeBBoxExtend object from inherited base classes: nn with example: obj = EdgeBBoxExtend()