Refine ParallelGraph Execution#15716

Merged

panyx0718 merged 11 commits intoPaddlePaddle:developfrom

Yancey0623:refine_pg

Feb 21, 2019

Commits on Feb 14, 2019

refine pg execution
Yancey1989
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Merge branch 'develop' of github.com:PaddlePaddle/Paddle into refine_pg
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cleanup code test=develop
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cleanup code test=develop
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fix build failed test=develop
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fix cpu test=develop
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Commits on Feb 18, 2019

update by comment test=develop
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update comment test=develop
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cleanup code test=develop
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Commits on Feb 19, 2019

polish code test=develop
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polish code test=develop
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