ParallelDyGraph with GPU collective mode#16827

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Yancey0623 merged 11 commits intoPaddlePaddle:developfrom

Yancey0623:prallel_dygraph_gpu

Apr 25, 2019

Commits on Apr 12, 2019

add collective hooks
Yancey1989
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Merge branch 'develop' of github.com:PaddlePaddle/Paddle into prallel_dygraph_gpu
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update
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Commits on Apr 18, 2019

add unittest test=develop
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polish code test=develop
Yancey1989
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polish code test=develop
Yancey1989
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Commits on Apr 22, 2019

fix ci test=develop
Yancey1989
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fix ci test=develop
Yancey1989
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fix build with cpu test=develop
Yancey1989
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Commits on Apr 23, 2019

fix py3 test=develop
Yancey1989
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Commits on Apr 24, 2019

update by comment test=develop
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