code: def test_hvd_distrib_single_node_spawn_cuda():
      world_size = torch.cuda.device_count()
  
      idist.spawn(
          "horovod",
          _test_distrib_config,
          args=("horovod", world_size, "cuda"),
          nproc_per_node=world_size,
      )
  
imports: import os
  import pytest
  import torch
  import ignite.distributed
  from ignite.distributed.utils import has_hvd_support
  from tests.ignite.distributed.utils import _test_distrib__get_max_length, _test_distrib_all_gather, _test_distrib_all_gather_group, _test_distrib_all_reduce, _test_distrib_all_reduce_group, _test_distrib_barrier, _test_distrib_broadcast, _test_distrib_config, _test_distrib_new_group, _test_distrib_one_rank_only, _test_distrib_one_rank_only_with_engine, _test_sync
label_desc: Use image node_id 5 for calling a global function with example usage: test_hvd_distrib_single_node_spawn_cuda() without return types