docstr: Test log_ratio_measure()
docstr_tok: ["Test","log_ratio_measure","(",")"]
code: def test_log_ratio_measure(self):
      """Test log_ratio_measure()"""
      obtained = direct_confirmation_measure.log_ratio_measure(
          self.segmentation, self.accumulator
      )[0]
      # Answer should be ~ ln{(1 / 5) / [(3 / 5) * (2 / 5)]} = -0.182321557
      expected = -0.182321557
      self.assertAlmostEqual(expected, obtained)
  
      mean, std = direct_confirmation_measure.log_ratio_measure(
          self.segmentation, self.accumulator, with_std=True
      )[0]
      self.assertAlmostEqual(expected, mean)
      self.assertEqual(0.0, std)
  
file_path: gensim/gensim/test/test_direct_confirmation.py
imports: import logging
  import unittest
  from collections import namedtuple
  from gensim.topic_coherence import direct_confirmation_measure
  from gensim.topic_coherence import text_analysis
label_desc: Use image node_id 3 for calling the TestDirectConfirmationMeasure obj's underlying member method code with example usage: obj.test_log_ratio_measure() without return types