code: def test_back_translation(self):
      if torch.cuda.is_available():
          self.sample_test_case("cuda")
      self.sample_test_case("cpu")
  
file_path: nlpaug/test/augmenter/word/test_back_translation.py
imports: import unittest
  import os
  import torch
  from dotenv import load_dotenv
  import nlpaug.augmenter.word
  import nlpaug.model.lang_models
label_desc: Use image node_id 3 for calling the TestBackTranslationAug obj's underlying member method code with example usage: obj.test_back_translation() without return types