code: def get_visible_devices():
      _visible_devices = os.environ.get("CUDA_VISIBLE_DEVICES")
      if _visible_devices is None:
          # FIXME: We assume that if the variable is unset there is only one GPU
          visible_devices = ["0"]
      else:
          visible_devices = _visible_devices.strip().split(",")
      return visible_devices
  
file_path: cugraph/python/cugraph/cugraph/dask/common/mg_utils.py
imports: import os
  import gc
  import numba.cuda
  from cugraph.dask.common.read_utils import MissingUCXPy
label_desc: Use image node_id 4 for calling a global function with example usage: get_visible_devices() and returns: visible_devices