code: def tearDown(self):
      global MNIST_DOWNLOAD_METHOD
      if MNIST_DOWNLOAD_METHOD is not None:
          import avalanche.benchmarks.classic.cfashion_mnist as cfashion_mnist
  
          avalanche.benchmarks.datasets.external_datasets.fmnist.get_fmnist_dataset = (
              MNIST_DOWNLOAD_METHOD
          )
          MNIST_DOWNLOAD_METHOD = None
  
file_path: avalanche/tests/benchmarks/classic/test_fmnist_benckmarks.py
imports: import unittest
  import avalanche.benchmarks.datasets.external_datasets.fmnist
  from avalanche.benchmarks import ClassificationExperience, SplitFMNIST
  from tests.unit_tests_utils import load_experience_train_eval, FAST_TEST, is_github_action
label_desc: Use image node_id 2 for calling the FMNISTBenchmarksTests obj's underlying member method code with example usage: obj.tearDown() without return types