code: def tearDown(self):
      # clean up the VRAM after each test
      super().tearDown()
      gc.collect()
      backend_empty_cache(torch_device)
  
imports: import gc
  import inspect
  import unittest
  import torch
  from parameterized import parameterized
  from diffusers import PriorTransformer
  from diffusers.utils.testing_utils import backend_empty_cache, enable_full_determinism, floats_tensor, slow, torch_all_close, torch_device
  from .test_modeling_common import ModelTesterMixin
label_desc: Use image node_id 2 for calling the PriorTransformerIntegrationTests obj's underlying member method code with example usage: obj.tearDown() without return types