code: def test_default_init(self, mock_is_available):
      mock_is_available.return_value = False
  
      clf = SimplePytorchClassifier(2)
      self.assertFalse(clf.multi_label)
      self.assertEqual("cpu", clf.device)
      mock_is_available.assert_called_with()
  
imports: import pytest
  import unittest
  from unittest.mock import Mock, patch
  from small_text.integrations.pytorch.exceptions import PytorchNotFoundError
  from small_text.training.model_selection import ModelSelection, NoopModelSelection
  from tests.utils.datasets import random_text_classification_dataset
label_desc: Use image node_id 1 for calling the SimplePytorchClassifierTest obj's underlying member method code with example usage: obj.test_default_init(mock_is_available) without return types