[2.0API] Reconstruct all API related to LR Scheduler, unify dygraph and static#26550

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zhwesky2010 merged 11 commits intoPaddlePaddle:developfrom zhwesky2010:reconstruct_lr_scheduler1

Aug 24, 2020

+1,962-75

Commits on Aug 20, 2020

Reconstruct all API related to lr scheduler, unify dygraph and static
zhwesky2010
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Merge branch 'develop' of https://github.com/PaddlePaddle/Paddle into develop
zhwesky2010
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