class_docstr: tests Vocabulary Class
class_docstr_tok: ["tests","Vocabulary","Class"]
code: def test_vocab_len_respects_cutoff(self):
      # Vocab size is the number of unique tokens that occur at least as often
      # as the cutoff value, plus 1 to account for unknown words.
      self.assertEqual(5, len(self.vocab))
  
imports: import unittest
  from collections import Counter
  from timeit import timeit
  from nltk.lm import Vocabulary
label_desc: Use image node_id 8 for calling the NgramModelVocabularyTests obj's underlying member method code with example usage: obj.test_vocab_len_respects_cutoff() without return types