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由 Yibing Liu 提交于
* Add LAMB optimizer * Expose LAMB Optimizer's APIs test=develop, test=document_preview * Cleanup code & doc test=develop, test=document_preview * Update lamb optimizer's formula test=develop
f9796b12
* Add LAMB optimizer * Expose LAMB Optimizer's APIs test=develop, test=document_preview * Cleanup code & doc test=develop, test=document_preview * Update lamb optimizer's formula test=develop