code: def test_model_compatibility_with_python_versions(self):
      fname_model_2_7 = datapath("ldamodel_python_2_7")
      model_2_7 = self.class_.load(fname_model_2_7)
      fname_model_3_5 = datapath("ldamodel_python_3_5")
      model_3_5 = self.class_.load(fname_model_3_5)
      self.assertEqual(model_2_7.num_topics, model_3_5.num_topics)
      self.assertTrue(
          np.allclose(model_2_7.expElogbeta, model_3_5.expElogbeta)
      )
      tstvec = []
      self.assertTrue(
          np.allclose(model_2_7[tstvec], model_3_5[tstvec])
      )  # try projecting an empty vector
      id2word_2_7 = dict(model_2_7.id2word.iteritems())
      id2word_3_5 = dict(model_3_5.id2word.iteritems())
      self.assertEqual(set(id2word_2_7.keys()), set(id2word_3_5.keys()))
  
imports: import logging
  import numbers
  import os
  import unittest
  import copy
  import numpy
  from numpy.testing import assert_allclose
  from gensim.corpora import mmcorpus, Dictionary
  from gensim.models import ldamodel, ldamulticore
  from gensim import matutils, utils
  from gensim.test import basetmtests
  from gensim.test.utils import datapath, get_tmpfile, common_texts
label_desc: Use image node_id 14 for calling the TestLdaModel obj's underlying member method code with example usage: obj.test_model_compatibility_with_python_versions() without return types