code: def test_init_and_len(self):
      data = random_transformer_dataset(10)
      dataset = TransformersDataset(data)
      self.assertEqual(10, len(dataset))
  
file_path: small-text/tests/integration/small_text/integrations/transformers/test_datasets.py
imports: import unittest
  import pytest
  import numpy
  from small_text.integrations.pytorch.exceptions import PytorchNotFoundError
label_desc: Use image node_id 1 for calling the TransformersDatasetTest obj's underlying member method code with example usage: obj.test_init_and_len() without return types