code: def _cnt_to_dsp(cnt):
      """Utility to convert length array to cumulative array."""
      return [0] + numpy.cumsum(cnt)[:-1].tolist()
  
imports: import mpi4py
  import numpy
  import chainer
  import chainer.backends
  import chainer.utils
  from chainer.utils import collections_abc
  from chainermn.communicators import _communication_utility
  from chainermn.communicators._communication_utility import chunked_bcast_obj
  from chainermn.communicators import _memory_utility
  from chainermn.communicators import communicator_base
  import chainerx
label_desc: Use image node_id 5 for calling a global function with example usage: _cnt_to_dsp(cnt) and returns: unknown