Fault tolerant distributed training, just work version, with etcd#2849

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typhoonzero merged 7 commits intoPaddlePaddle:developfrom typhoonzero:etcd_cord

Jul 17, 2017

+81-32

Commits on Jul 13, 2017

using etcd as fault tolerant training
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update
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Commits on Jul 14, 2017

workable version, ft not tested
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Merge branch 'develop' of https://github.com/PaddlePaddle/Paddle into etcd_cord
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small fix
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update
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Commits on Jul 17, 2017

remove TODO
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