code: def xp(self):
      return self.device.xp
  
imports: import functools
  import chainer
  from chainer import backend
  from chainer.testing import _bundle
  from chainer.testing import attr
  import chainerx
label_desc: Use image node_id 4 for calling the BackendConfig obj's underlying member method code with example usage: obj.xp() and returns: self