class_docstr: Tests for bluefog/torch/mpi_ops.py on one-sided communication.
code: def tearDown(self):
      assert bf.win_free()
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import inspect
  import itertools
  import time
  import warnings
  import unittest
  from bluefog.common import topology_util
  import bluefog.torch
  import torch
  import numpy
label_desc: Use image node_id 3 for calling the WinOpsTests obj's underlying member method code with example usage: obj.tearDown() without return types