code: def allreduce(*args, **kwargs):
      return MPI.COMM_WORLD.Allreduce(*args, **kwargs)
  
file_path: spinningup/spinup/utils/mpi_tools.py
imports: from mpi4py import MPI
  import os, subprocess, sys
  import numpy
label_desc: Use image node_id 4 for calling a global function with example usage: allreduce() and returns: MPI