code: def testFilterKeepTokens_unchangedFunctionality(self):
      # do not provide keep_tokens argument, filter_extremes functionality is unchanged
      d = Dictionary(self.texts)
      d.filter_extremes(no_below=3, no_above=1.0)
      expected = {"graph", "trees", "system", "user"}
      self.assertEqual(set(d.token2id.keys()), expected)
  
imports: from collections.abc import Mapping
  from itertools import chain
  import logging
  import unittest
  import codecs
  import os
  import os.path
  import scipy
  import gensim
  from gensim.corpora import Dictionary
  from gensim.utils import to_utf8
  from gensim.test.utils import get_tmpfile, common_texts
label_desc: Use image node_id 10 for calling the TestDictionary obj's underlying member method code with example usage: obj.testFilterKeepTokens_unchangedFunctionality() without return types