code: def test_vgg16(self):
      keras.backend.set_image_dim_ordering("th")
      kmodel = vgg16.VGG16(
          include_top=False, input_shape=(3, 224, 224), weights=None
      )
      input_data = np.random.random([2, 3, 224, 224])
      self.assert_model(input_data, kmodel)
  
file_path: BigDL/python/dllib/test/bigdl/nn/test_application.py
imports: from __future__ import print_function
  from keras.layers import *
  import pytest
  from keras.applications import *
  from bigdl.dllib.keras.converter import *
  from keras.applications.music_tagger_crnn import MusicTaggerCRNN
  from test.bigdl.test_utils import BigDLTestCase, TestModels
  from bigdl.dllib.nn.keras.backend import *
label_desc: Use image node_id 5 for calling the TestApplication obj's underlying member method code with example usage: obj.test_vgg16() without return types