class_docstr: Unit test class for model creation process under various option values and
  types of input data.
class_docstr_tok: ["Unit","test","class","for","model","creation","process","under","various","option","values","and","types","of","input","data","."]
docstr: Test that loading a model from the previous version works correctly.
  This test does not make sense until GLC v1.5 at least, because the first
  version of the toolkit appears in GLC v1.4.
docstr_tok: ["Test","that","loading","a","model","from","the","previous","version","works","correctly",".","This","test","does","not","make","sense","until","GLC","v1.5","at","least",",","because","the","first","version","of","the","toolkit","appears","in","GLC","v1.4","."]
code: def test_backward_compatibility(self):
      """
      Test that loading a model from the previous version works correctly.
      This test does not make sense until GLC v1.5 at least, because the first
      version of the toolkit appears in GLC v1.4.
      """
      pass
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  import unittest
  import copy
  import array
  import numpy
  import turicreate
  from .None import util
  from turicreate.util import _assert_sframe_equal
  from turicreate.toolkits._main import ToolkitError
  import sys
label_desc: Use image node_id 6 for calling the KnnClassifierCreateTest obj's underlying member method code with example usage: obj.test_backward_compatibility() without return types