code: def testFilterKeepTokens_keepTokens(self):
      # provide keep_tokens argument, keep the tokens given
      d = Dictionary(self.texts)
      d.filter_extremes(
          no_below=3, no_above=1.0, keep_tokens=["human", "survey"]
      )
      expected = {"graph", "trees", "human", "system", "user", "survey"}
      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 9 for calling the TestDictionary obj's underlying member method code with example usage: obj.testFilterKeepTokens_keepTokens() without return types