code: def test_from_chx(self, backend_config):
      arr = backend_config.get_array(numpy.ones((2, 3), numpy.float32))
      arr_converted = backend.from_chx(arr)
  
      src_device = backend_config.device
      if src_device.xp is chainerx:
          dst_xp = src_device.fallback_device.xp
          assert isinstance(arr_converted, dst_xp.ndarray)
          if dst_xp is cuda.cupy:
              assert arr_converted.device.id == src_device.device.index
      else:
          assert arr is arr_converted
  
      with backend_config:
          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 2 for calling the TestFromToChainerx obj's underlying member method code with example usage: obj.test_from_chx(backend_config) without return types