class_docstr: tests Vocabulary Class
class_docstr_tok: ["tests","Vocabulary","Class"]
code: def test_eqality(self):
      v1 = Vocabulary(["a", "b", "c"], unk_cutoff=1)
      v2 = Vocabulary(["a", "b", "c"], unk_cutoff=1)
      v3 = Vocabulary(["a", "b", "c"], unk_cutoff=1, unk_label="blah")
      v4 = Vocabulary(["a", "b"], unk_cutoff=1)
  
      self.assertEqual(v1, v2)
      self.assertNotEqual(v1, v3)
      self.assertNotEqual(v1, v4)
  
imports: import unittest
  from collections import Counter
  from timeit import timeit
  from nltk.lm import Vocabulary
label_desc: Use image node_id 18 for calling the NgramModelVocabularyTests obj's underlying member method code with example usage: obj.test_eqality() without return types