ElaineBao commented on issue #17906: Optimize AddTakeGrad Tensor Sum
URL: https://github.com/apache/incubator-mxnet/pull/17906#issuecomment-604176384
   @leezu I cannot say all tensor-level summation is slow, after all I haven't 
run all the cases. 
   But changing tensor-level summation to element-wise summation actually 
increases the amount of code and makes the code less readable, so if not for 
known efficiency issue, I think it's better to remain unchanged and using 
tensor-level summation.

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