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由 Zhou Wei 提交于
* add new API: MultiStepDecay, a new learing rate strategy, test=develop * add new API: MultiStepDecay, a new learing rate strategy,test=develop * add new API: MultiStepDecay, a new learing rate strategy,test=develop * add base class of LearningRateEpochDecay, and MultiStepDecay, and StepDecay, test=develop * fix doc to add coverage,test=develop
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