code: def test_none_device(self):
      for model_path in self.model_paths:
          aug = naw.ContextualWordEmbsAug(
              model_path=model_path, force_reload=True, device=None
          )
          self.assertTrue(aug.device == "cpu")
  
imports: import unittest
  import os
  from dotenv import load_dotenv
  import torch
  import nlpaug.augmenter.word
  import nlpaug.model.lang_models
label_desc: Use image node_id 4 for calling the TestContextualWordEmbsAug obj's underlying member method code with example usage: obj.test_none_device() without return types