code: def teardown(client, cluster=None):
      Comms.destroy()
      # Shutdown the connected scheduler and workers
      # therefore we will no longer rely on killing the dask cluster ID
      # for MNMG runs
      client.shutdown()
      if cluster:
          cluster.close()
  
imports: import numpy
  import dask_cudf
  from dask.distributed import Client
  from dask_cuda import LocalCUDACluster
  from cugraph.structure.symmetrize import symmetrize_ddf
  from cugraph.dask.common.mg_utils import get_visible_devices
  from dask_cuda.initialize import initialize
  import cudf
  import cugraph
  from cugraph.dask.comms import comms
  import tempfile
  from cugraph.testing.mg_utils import generate_edgelist
label_desc: Use image node_id 14 for calling a global function with example usage: teardown(client, cluster) without return types