code: def test_save_inference_model(self):
      self.module.save_inference_model("./inference/model")
  
      self.assertTrue(os.path.exists("./inference/model.pdmodel"))
      self.assertTrue(os.path.exists("./inference/model.pdiparams"))
  
file_path: PaddleHub/modules/text/lexical_analysis/lac/test.py
imports: import os
  import shutil
  import unittest
  import paddlehub
label_desc: Use image node_id 8 for calling the TestHubModule obj's underlying member method code with example usage: obj.test_save_inference_model() without return types