code: def test_expected_gradient_length_str(self):
      strategy = ExpectedGradientLength(2)
      expected_str = "ExpectedGradientLength()"
      self.assertEqual(expected_str, str(strategy))
  
file_path: small-text/tests/unit/small_text/integrations/pytorch/test_strategies.py
imports: import unittest
  import pytest
  import numpy
  from small_text.integrations.pytorch.exceptions import PytorchNotFoundError
label_desc: Use image node_id 3 for calling the ExpectedGradientLengthTest obj's underlying member method code with example usage: obj.test_expected_gradient_length_str() without return types