def METHOD_NAME(self):
    """
    Test whether GPU training brings performance improvements.
    """
    cpu_result = self.__run(False)
    gpu_result = self.__run(True)
    # This test is not that well suited for GPU performance
    # but we should at least see some kind of speed up.
    assert np.isclose(cpu_result[0], gpu_result[0], atol=accuracy)
    assert gpu_result[1] > cpu_result[1] / performance_improvement