code: def test_accumulate1(self):
      accumulator = InvertedIndexAccumulator(
          self.top_ids, self.dictionary
      ).accumulate(self.texts, 2)
      # [['this', 'is'], ['is', 'a'], ['test', 'document'], ['this', 'test'],
      #  ['test', 'document'], ['test', 'test'], ['test', 'this']]
      inverted_index = accumulator.index_to_dict()
      expected = {
          10: {0, 3, 6},
          15: {0, 1},
          20: {1},
          21: {2, 3, 4, 5, 6},
          17: {2, 4},
      }
      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 1 for calling the TestInvertedIndexAccumulator obj's underlying member method code with example usage: obj.test_accumulate1() without return types