Created by: zhiqiu

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Describe

Refine deprecated decorator, show deprecation warning once.

For the following case, the original deprecated on reduce_mean will print too many warnings, this PR fixes that.

import paddle

def model(x):
    return paddle.fluid.layers.reduce_mean(x)   # reduce_mean is decorated with @deprecated

paddle.disable_static()
for epoch in range(5):
    for batch in range(100):
        x = paddle.rand([2, 10])
        loss = model(x)
        if batch % 100 == 0:
            print(loss)

• before

• after