code: def test_runningmeanstd():
      import subprocess
  
      subprocess.check_call(
          [
              "mpirun",
              "-np",
              "3",
              "python",
              "-c",
              "from baselines.common.mpi_moments import _helper_runningmeanstd; _helper_runningmeanstd()",
          ]
      )
  
imports: from mpi4py import MPI
  import numpy
  from baselines.common import zipsame
label_desc: Use image node_id 3 for calling a global function with example usage: test_runningmeanstd() without return types