code: def test_main(self):
      try:
          model = ppdet.model_zoo.get_model(MODEL_NAME)
          assert isinstance(model, paddle.nn.Layer)
      except:
          self.assertTrue(False)
  
file_path: PaddleDetection/ppdet/model_zoo/tests/test_get_model.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  import paddle
  import ppdet
  import unittest
label_desc: Use image node_id 1 for calling the TestGetModel obj's underlying member method code with example usage: obj.test_main() without return types