liuzh91 opened a new pull request #16900: introduce  gradient update handler to 
the  base estimator
URL: https://github.com/apache/incubator-mxnet/pull/16900
 
 
   ## Description ##
   This change add default gradient update handler to the base estimator class. 
The purpose of this change is to decouple the forward/backward computation with 
the gradient apply process. In some use cases such as gradient accumulation, 
gradient updates are not executed during each training batch.  See issue 
description #16869.

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