code: def test_len(self):
      self.assertEqual(len(self.vocab), 5)
  
file_path: pytext/pytext/torchscript/tests/test_vocab.py
imports: import unittest
  import torch
  from pytext.torchscript.vocab import ScriptVocabulary
  from torch import jit
label_desc: Use image node_id 8 for calling the VocabTest obj's underlying member method code with example usage: obj.test_len() without return types