code: def test_reduce_scatter(self, config):
      spawn_and_init(
          functools.partial(self._test_reduce_scatter, **config)
      )
  
file_path: fairscale/tests/utils/test_reduce_scatter_bucketer.py
imports: import functools
  import itertools
  import sys
  import unittest
  from unittest import mock
  from parameterized import parameterized
  import torch
  from fairscale.fair_dev.testing.testing import dist_init, spawn_for_all_world_sizes
  from fairscale.internal import torch_version
  from fairscale.internal.reduce_scatter_bucketer import ReduceScatterBucketer
label_desc: Use image node_id 2 for calling the TestReduceScatterBucketer obj's underlying member method code with example usage: obj.test_reduce_scatter(config) without return types