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refine cpu softmax bwd#17534

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tensor-tang merged 8 commits intoPaddlePaddle:developfrom
tensor-tang:softmax_bwd
May 24, 2019
Merged

refine cpu softmax bwd#17534
tensor-tang merged 8 commits intoPaddlePaddle:developfrom
tensor-tang:softmax_bwd

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based on #17522

improve 30X

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test=develop
test=develop
@luotao1 luotao1 requested review from a user and jczaja May 21, 2019 12:24
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LGTM

@tensor-tang tensor-tang merged commit 7ae461e into PaddlePaddle:develop May 24, 2019
@tensor-tang tensor-tang deleted the softmax_bwd branch May 24, 2019 01:19
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