code: def scale_xy(self):
      return self.scale_xy_
  
imports: from math import sqrt
  import itertools
  import torch
  import torch.nn.functional
  from torch.jit.annotations import Tuple, List
  from torch import nn, Tensor
  import numpy
label_desc: Use image node_id 2 for calling the DefaultBoxes obj's underlying member method code with example usage: obj.scale_xy() and returns: self