Cache the chosen kernel of operators'.#16004

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luotao1 merged 3 commits intoPaddlePaddle:developfrom

Xreki:core_opt_choose_kernel

Apr 8, 2019

Commits on Mar 1, 2019

Cache the chosen kernel of operators'.
Xreki
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Commits on Mar 4, 2019

Merge branch 'develop' into core_opt_choose_kernel
Xreki
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Commits on Mar 5, 2019

Refine codes.
Xreki
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