code: def using_GPU():
      # Once a CUDA context is created, the process cannot be forked.
      # Note: This seems to be a partial fix. Even if we are running cpu-only
      # tests, if MPI is built with CUDA support we can still fail. Unfortunately
      # there is no runtime check for us to detect if it's the case...
      using_cupy = sys.modules.get("cupy") is not None
      using_numba = sys.modules.get("numba") is not None
      return using_cupy or using_numba
  
imports: from mpi4py import MPI
  import mpiunittest
  import sys, os, mpi4py
label_desc: Use image node_id 6 for calling a global function with example usage: using_GPU() and returns: unknown