code: def test_vgg1_layers(self):
      self.assertEqual(len(self.vgg1_layers), 23)
  
file_path: TensorLayer/tests/pending/test_models.py
imports: import os
  import unittest
  import tensorflow
  import tensorlayer
  from tests.utils import CustomTestCase
label_desc: Use image node_id 3 for calling the VGG_Model_Test obj's underlying member method code with example usage: obj.test_vgg1_layers() without return types