code: def test_to_device():
      a = chainerx.ones((2,), chainerx.float32, device="native:0")
      dst_device = chainerx.get_device("native:1")
  
      b0 = a.to_device(dst_device)  # by device instance
      assert b0.device is dst_device
      chainerx.testing.assert_array_equal_ex(a, b0)
  
      b1 = a.to_device("native:1")  # by device name
      assert b1.device is dst_device
      chainerx.testing.assert_array_equal_ex(a, b1)
  
      b2 = a.to_device("native", 1)  # by backend name and index
      assert b2.device is dst_device
      chainerx.testing.assert_array_equal_ex(a, b2)
  
imports: import copy
  import math
  import pickle
  import numpy
  import pytest
  import chainerx
  import chainerx.testing
  from chainerx_tests import array_utils
label_desc: Use image node_id 6 for calling a global function with example usage: test_to_device() without return types