docstr: Make sure saving and loading retains things.
code: def test_save_and_load(self):
      """
      Make sure saving and loading retains things.
      """
      if self.model is None:
          return
  
      filename = "save_file%s" % (str(uuid.uuid4()))
      old_model = self.model
  
      self.model.save(filename)
      self.model = tc.load_model(filename)
  
      try:
          self.test_predict()
          print("Predict passed")
          self.test_classify()
          print("Predict passed")
      except:
          self.assertTrue(
              False, "Failed during save & load diagnostics"
          )
      finally:
          self.model = old_model
          shutil.rmtree(filename)
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  import unittest
  import turicreate
  import uuid
  from turicreate.toolkits import evaluation
  from turicreate.toolkits._main import ToolkitError
  import shutil
  import numpy
label_desc: Use image node_id 2 for calling the FastPathPredictionTest obj's underlying member method code with example usage: obj.test_save_and_load() without return types