def testGradientFloat64(self):
    with self.cached_session():
      x_val = [[-0.9, -0.7, -0.5, -0.3, -0.1], [0.1, 0.3, 0.5, 0.7, 0.9]]
      x = np.asarray(x_val, dtype=np.float64, order="F")
      err = gradient_checker_v2.max_error(