apeforest commented on issue #17882:
URL: https://github.com/apache/incubator-mxnet/pull/17882#issuecomment-616859584


   > > Please add more details in the PR description to explain the rationale 
of this change:
   > 
   > @apeforest
   > 
   > 1. Its there in the PR Heading. Additionally, its being done to improve 
BERT performance regression when using Large Tensor Build
   > 2. Leverages vectorization. Can't explain line by line as to how. Too much 
text to write. I can share a link about vectorization for reviewers to read. 
Let me know if you meant something else. I can write 1 line each for 3 cases 
which is necessary
   > 3. I didn't understand this question. Could you clarify what meant by 
side-effect.
   
   1. The title tells readers this PR will change the performance of 
broadcast_axis. However, I am not familiar with which tricks/algorithms you 
employed to make it faster. It would greatly help people understand code if you 
could mention it in PR description with a few sentences or a pseudo code.
   
   2. vectorization is a very general term. Please add more details here. You 
could even copy some of them from your code comment
   
   3. Side effect means any downside or potential problem will this change. 
e.g. slow down with other inputs, or not supporting certain inputs, backward 
compatibility etc.


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