code: def sqr(x, wait=0.0):
      time.sleep(wait)
      return x * x
  
imports: from mpi4py import MPI
  import mpi4py.util.pool
  import concurrent.futures
  import itertools
  import functools
  import warnings
  import unittest
  import time
  import sys
  import os
label_desc: Use image node_id 1 for calling a global function with example usage: sqr(x, wait) and returns: unknown