Created by: lgone2000

复现代码如下。虽然和qingqing沟通可以绕过，但还是希望这个要当作bug解决。

def testscale():
    x = fluid.layers.data(name='x', shape=[1], dtype='float32')
    y = x * 2
    z = paddle.fluid.layers.scale(x, 2)
    place = fluid.CPUPlace()
    exe = fluid.Executor(place)
    exe.run(fluid.default_startup_program())
    inputdata = np.array([1],np.float32)
    output = exe.run(
                fluid.default_main_program(),
                feed={'x': inputdata},
                fetch_list=[x.name, y.name, z.name]
            )
    #should output 1,2,2 ; but it output 1,2,1
    print output