code: def run(self):
      with chainer.using_device(self.device):
          self._run()
  
imports: from __future__ import absolute_import
  import warnings
  import numpy
  import six
  import chainer
  from chainer import backend
  from chainer.backends import _cpu
  from chainer.backends import cuda
  from chainer import configuration
  from chainer import testing
  from chainer import utils
  from chainer import variable
  import chainerx
label_desc: Use image node_id 2 for calling the _CheckBackward obj's underlying member method code with example usage: obj.run() without return types