[bug fix] avoiding multiple initialization of gloo for fleet in dygraph mode#27706

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guru4elephant merged 16 commits intoPaddlePaddle:developfrom

sandyhouse:gloo_dygraph_fleet_fix

Sep 30, 2020

Commits on Sep 8, 2020

add double grad for expand, test=develop
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update, test=develop
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Commits on Sep 10, 2020

Commits on Sep 15, 2020

Merge branch 'develop' of https://github.com/PaddlePaddle/Paddle into develop
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Commits on Sep 16, 2020

Merge branch 'develop' of https://github.com/PaddlePaddle/Paddle into develop
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Commits on Sep 18, 2020

Merge branch 'develop' of https://github.com/PaddlePaddle/Paddle into develop
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Commits on Sep 21, 2020

Commits on Sep 22, 2020

Merge branch 'develop' of https://github.com/PaddlePaddle/Paddle into develop
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Commits on Sep 28, 2020

Merge branch 'develop' of https://github.com/sandyhouse/Paddle into develop
sandyhouse
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Commits on Sep 29, 2020

Merge branch 'develop' of https://github.com/PaddlePaddle/Paddle into develop
sandyhouse
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bug fix for fleet dygraph, test=develop
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python/paddle/distributed/fleet/base/role_maker.py
sandyhouse
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Merge branch 'develop' of https://github.com/PaddlePaddle/Paddle into gloo_dygraph_fleet_fix, test=develop
sandyhouse
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update, test=develop
sandyhouse
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