code: def test_to_chx(self, backend_config):
      arr = backend_config.get_array(numpy.ones((2, 3), numpy.float32))
      arr_converted = backend.to_chx(arr)
  
      src_device = backend_config.device
      assert isinstance(arr_converted, chainerx.ndarray)
      if src_device.xp is chainerx:
          assert arr is arr_converted
      elif src_device.xp is cuda.cupy:
          assert arr.device.id == arr_converted.device.index
  
      self.check_equal_memory_shared(arr, arr_converted)
  
imports: import unittest
  import numpy
  import chainer
  from chainer import backend
  from chainer.backends import cuda
  from chainer import testing
  from chainer.testing import attr
  import chainerx
label_desc: Use image node_id 3 for calling the TestFromToChainerx obj's underlying member method code with example usage: obj.test_to_chx(backend_config) without return types