class_docstr: DGL context strucure.
code: def __hash__(self):
      return hash((self.device_type, self.device_id))
  
imports: from __future__ import absolute_import
  import ctypes
  import json
  import numpy
  from ..None import _api_internal
  from .base import _LIB, check_call
label_desc: Use image node_id 16 for calling the DGLContext obj's underlying member method code with example usage: obj.__hash__() and returns: hash