code: def finalize(self):
      super(NonCudaAwareCommunicator, self).finalize()
      if self.intra_nccl_comm is not None:
          chainer.cuda.Stream.null.synchronize()
          self.mpi_comm.barrier()
          self.intra_nccl_comm.destroy()
          self.intra_nccl_comm = None
  
file_path: chainer/chainermn/communicators/non_cuda_aware_communicator.py
imports: import warnings
  import chainer.cuda
  import chainerx
  import math
  import mpi4py.MPI
  import numpy
  from chainermn.communicators import _communication_utility
  from chainermn.communicators import _memory_utility
  from chainermn.communicators import mpi_communicator_base
  from chainermn import nccl
label_desc: Use image node_id 2 for calling the NonCudaAwareCommunicator obj's underlying member method code with example usage: obj.finalize() without return types