code: def test_accumulate2(self):
      accumulator = InvertedIndexAccumulator(
          self.top_ids, self.dictionary
      ).accumulate(self.texts, 3)
      # [['this', 'is', 'a'], ['test', 'document'], ['this', 'test', 'document'],
      #  ['test', 'test', 'this']
      inverted_index = accumulator.index_to_dict()
      expected = {
          10: {0, 2, 3},
          15: {0},
          20: {0},
          21: {1, 2, 3},
          17: {1, 2},
      }
      self.assertDictEqual(expected, inverted_index)
  
imports: import logging
  import unittest
  from gensim.corpora.dictionary import Dictionary
  from gensim.topic_coherence.text_analysis import InvertedIndexAccumulator, WordOccurrenceAccumulator, ParallelWordOccurrenceAccumulator, CorpusAccumulator
  from gensim.test.utils import common_texts
label_desc: Use image node_id 2 for calling the TestInvertedIndexAccumulator obj's underlying member method code with example usage: obj.test_accumulate2() without return types