ThomasDelteil commented on issue #8074: how to disable the bp of the bottom 
layers ?
URL: 
https://github.com/apache/incubator-mxnet/issues/8074#issuecomment-402566778
 
 
   @starimpact if you are keen to switch to Gluon, one way is to do the 
propagation of the first part of your network outside the `autograd.record()` 
scope, and the part where you want actual bp to happen within the 
`autograd.record()` scope, which effectively is equivalent to your proposed 
solution with two modules.
   
   @starimpact please consider closing your issue if it is no longer current

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