code: def _get_test_write_file_and_cuda_buffer(tmpdir, ref_buffer, index=0):
      test_file = _get_test_write_file(tmpdir, index)
      test_buffer = get_accelerator().ByteTensor(list(ref_buffer))
      return test_file, test_buffer
  
imports: import pytest
  import os
  import filecmp
  import torch
  import deepspeed
  import deepspeed.comm
  from deepspeed.accelerator import get_accelerator
  from deepspeed.ops.op_builder import AsyncIOBuilder
  from unit.common import DistributedTest
label_desc: Use image node_id 5 for calling a global function with example usage: _get_test_write_file_and_cuda_buffer(tmpdir, ref_buffer, index) and returns: test_file,  test_buffer