code: def cpu(dev_id=0):
      """Construct a CPU device
  
      Parameters
      ----------
      dev_id : int, optional
          The integer device id
  
      Returns
      -------
      ctx : DGLContext
          The created context
      """
      return DGLContext(1, dev_id)
  
imports: from __future__ import absolute_import
  import ctypes
  import functools
  import operator
  import numpy
  from .None import backend
  from ._ffi.function import _init_api
  from ._ffi.ndarray import _set_class_ndarray, context, DGLContext, DGLDataType, empty, empty_shared_mem, from_dlpack, NDArrayBase, numpyasarray
  from ._ffi.object import ObjectBase, register_object
label_desc: Use image node_id 1 for calling a global function with example usage: cpu(dev_id) and returns: DGLContext