code: def get_device(device_spec: types.DeviceSpec) -> Device:
      """Returns a device object.
  
      Args:
          device_spec (object): Device specifier.
              If a :class:`chainer.backend.Device` instance is given, it is
              returned intact. Otherwise the following values are supported:
  
              * ChainerX devices
  
                * A string representing a device.
                  (ex. ``'native:0'``, ``'native'``)
                * A :class:`chainerx.Device` object.
  
              * CuPy
  
                * A string starts with ``'@cupy:'``.
                  (ex. ``'@cupy:0'``)
                * A :class:`cupy.cuda.Device` object.
  
              * NumPy
  
                * The string ``'@numpy'``.
  
              * NumPy with Intel Architecture
  
                * The string ``'@intel64'``.
      """
      if isinstance(device_spec, Device):
          return device_spec
  
      if isinstance(device_spec, cuda._integer_types):
          return _get_device_cupy_or_numpy(device_spec)
  
      if chainerx.is_available() and isinstance(
          device_spec, chainerx.Device
      ):
          return _chainerx.ChainerxDevice(device_spec)
  
      if cuda.available and isinstance(device_spec, cuda.Device):
          return cuda.GpuDevice(device_spec)
  
      if isinstance(device_spec, six.string_types):
          # '-1', '0', '1', ...
          try:
              int_device_spec = int(device_spec)
          except ValueError:
              pass
          else:
              return _get_device_cupy_or_numpy(int_device_spec)
  
          if device_spec.startswith("@"):
              # '@module:...'
              mod_name, colon, precise_spec = device_spec[1:].partition(
                  ":"
              )
              if mod_name == "numpy":
                  if not colon:
                      return _cpu.CpuDevice()
              elif mod_name == "cupy":
                  if colon:
                      return cuda.GpuDevice.from_device_id(
                          int(precise_spec)
                      )
              elif mod_name == "intel64":
                  if not colon:
                      return intel64.Intel64Device()
              raise ValueError(
                  "Device specifiers starting with '@' must be followed by"
                  " a module name and depending on the module, module specific"
                  " precise device specifiers. Actual: {}".format(
                      device_spec
                  )
              )
          else:
              # String device specifier without '@' prefix is assumed to be a
              # ChainerX device.
              if not chainerx.is_available():
                  raise RuntimeError(
                      "Tried to parse ChainerX device specifier '{}', "
                      "but ChainerX is not available. "
                      "Note that device specifiers without '@' prefix are "
                      "assumed to be ChainerX device "
                      "specifiers.".format(device_spec)
                  )
              return _chainerx.ChainerxDevice(
                  chainerx.get_device(device_spec)
              )
  
      raise TypeError(
          "Device specifier must be a backend.Device, cuda.Device,"
          " chainerx.Device, integer or a string. Actual: {}".format(
              type(device_spec)
          )
      )
  
imports: import numpy
  import six
  import chainer
  from chainer.backends import _chainerx
  from chainer.backends import _cpu
  from chainer.backends import cuda
  from chainer.backends import intel64
  import chainerx
  from chainer._backend import Device
  from chainer.backends._chainerx import ChainerxDevice
  from chainer.backends._chainerx import from_chx
  from chainer.backends._chainerx import to_chx
  from chainer.backends._cpu import CpuDevice
  from chainer.backends.cuda import GpuDevice
  from chainer.backends.intel64 import Intel64Device
  from chainer import types
label_desc: Use image node_id 4 for calling a global function with example usage: get_device(device_spec) and returns: device_spec, _get_device_cupy_or_numpy, _chainerx, cuda, _get_device_cupy_or_numpy, _chainerx, _cpu, cuda, intel64