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Returns the name of a GPU device if available or a empty string.

Used in the notebooks

Used in the tutorials

This method should only be used in tests written with tf.test.TestCase.

class MyTest(tf.test.TestCase):

  def test_add_on_gpu(self):
    if not tf.test.is_built_with_gpu_support():
      self.skipTest("test is only applicable on GPU")

    with tf.device(tf.test.gpu_device_name()):
      self.assertEqual(tf.math.add(1.0, 2.0), 3.0)