class_docstr: A base class of objects with multi-device hierarchy.
docstr: :class:`~chainer.backend.Device` instance.
docstr_tok: [":","class",":","`","~chainer.backend.Device","`","instance","."]
code: def device(self):
      """:class:`~chainer.backend.Device` instance."""
      return self._device
  
imports: from __future__ import absolute_import
  import abc
  import sys
  import threading
  import typing
  import warnings
  import numpy
  import chainer
  from chainer import backend
  from chainer.backends import _cpu
  from chainer.backends import cuda
  from chainer.backends import intel64
  from chainer import types
  from chainer import utils
  import chainerx
label_desc: Use image node_id 3 for calling the DeviceResident obj's underlying member method code with example usage: obj.device() and returns: self