code: def gpu(device_id):
      """
      Returns GPU device descriptor
  
      Returns:
          :class:`~cntk.device.DeviceDescriptor`: GPU device descriptor
      """
      return cntk_py.DeviceDescriptor.gpu_device(device_id)
  
file_path: CNTK/bindings/python/cntk/device.py
imports: from enum import Enum, unique
  from .None import cntk_py
  from cntk.internal import typemap
label_desc: Use image node_id 3 for calling a global function with example usage: gpu(device_id) and returns: cntk_py