code: def test_from_sequences(self):
      from_sequences_vocab = Vocabulary.from_sequences([self.tokens])
      self.assertCountEqual(
          self.vocab.idx2tok, from_sequences_vocab.idx2tok
      )
  
imports: import unittest
  from collections import defaultdict
  import numpy
  import numpy.testing
  from cornac.data import TextModality, ReviewModality
  from cornac.data.text import SPECIAL_TOKENS, DEFAULT_PRE_RULES, BaseTokenizer, Vocabulary, CountVectorizer, TfidfVectorizer
label_desc: Use image node_id 7 for calling the TestVocabulary obj's underlying member method code with example usage: obj.test_from_sequences() without return types