code: def visit_variable(self, param):
      assert isinstance(param, chainer.Variable)
      param.to_chx()
  
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 _ToChxVisitor obj's underlying member method code with example usage: obj.visit_variable(param) without return types