code: def as_ltrb_list(self):
      return [x for x in self.dboxes_ltrb.view(-1).numpy()]
  
imports: import torch
  import torchvision.transforms
  import torch.utils.data
  from PIL import Image
  import os
  import numpy
  import random
  import itertools
  import torch.nn.functional
  import json
  import time
  import bz2
  import pickle
  from math import sqrt
label_desc: Use image node_id 4 for calling the DefaultBoxes obj's underlying member method code with example usage: obj.as_ltrb_list() and returns: unknown