fix Flatten api test=develop#26346

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yaoxuefeng6 merged 3 commits intoPaddlePaddle:developfrom

yaoxuefeng6:fix_Flatten

Aug 24, 2020

Commits on Aug 17, 2020

fix Flatten api test=develop
yaoxuefeng6
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Commits on Aug 21, 2020

Merge branch 'develop' of https://github.com/PaddlePaddle/Paddle into fix_Flatten
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fix class Flatten ut test=develop
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