Fix the example code in some Python API.#17343

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guoshengCS merged 3 commits intoPaddlePaddle:developfrom

guoshengCS:fix-api-example

May 24, 2019

Commits on May 11, 2019

Fix the example code in some Python API.
guoshengCS
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Commits on May 13, 2019

Fix the example code in some Python API by adding import.
guoshengCS
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Commits on May 23, 2019

Merge branch 'develop' of https://github.com/PaddlePaddle/Paddle into fix-api-example
guoshengCS
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