code: def testDevice(self):
      if tf.test.is_gpu_available():
          with tf.device("GPU:0"):
              x = np.ones([1, 2])
          self.assertIn("GPU", tf.convert_to_tensor(x).device)
      with tf.device("CPU:0"):
          x = np.ones([1, 2])
      self.assertIn("CPU", tf.convert_to_tensor(x).device)
  
imports: import numpy
  import tensorflow.compat.v2
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops.numpy_ops import np_math_ops
label_desc: Use image node_id 5 for calling the ReadmeTest obj's underlying member method code with example usage: obj.testDevice() without return types