code: def tearDown(self):
      self.pool.free_all_blocks()
      cupy.cuda.set_allocator(self.old_pool.malloc)
  
imports: import unittest
  import pytest
  import cupy
  from cupy import cuda
  from cupy import testing
label_desc: Use image node_id 2 for calling the TestDLTensorMemory obj's underlying member method code with example usage: obj.tearDown() without return types