code: def _save_and_load_for_serve(self):
      assert (
          self._save_model_dir is not None
      ), "save_model_dir is not specified"
      if self._train:
          self.save()
      if self._serve:
          self.restore(restore_serve=True)
  
imports: import tensorflow
  import numpy
  import os
label_desc: Use image node_id 9 for calling the Recommender obj's underlying member method code with example usage: obj._save_and_load_for_serve() without return types