code: def __init__(self, mpi_comm):
      super(FlatCommunicator, self).__init__(mpi_comm)
  
      self.gpu_buffer_a = _memory_utility.DeviceMemory()
      self.gpu_buffer_b = _memory_utility.DeviceMemory()
  
imports: import numpy
  from chainermn.communicators import _memory_utility
  from chainermn.communicators import mpi_communicator_base
label_desc: Use image node_id 1 to create a new FlatCommunicator object from inherited base classes: mpi_communicator_base with example: obj = FlatCommunicator(mpi_comm)