code: def _test_ensure():
      _ensure_initialized()
      rank = torch.distributed.get_rank()
      x = torch.rand(10).cuda()
      ensure_comm(x, None)
  
file_path: fastmoe/tests/test_comm.py
imports: import pytest
  import os
  import sys
  import json
  import math
  import torch
  import torch.distributed
  import torch.nn.functional
  from fmoe.functions import ensure_comm
  from test_ddp import _ensure_initialized, _run_distributed
label_desc: Use image node_id 2 for calling a global function with example usage: _test_ensure() without return types