kpot commented on issue #8337: mx.autograd.grad works or fails depending on use 
of slices
   @roywei To be honest, over the last months I've already lost the context and 
don't remember what I was using the slicing for. You're correct by saying it 
may not be an ideal way. But as a developer I know how a seemingly 
insignificant issue can help to discover really big bugs in a software project. 
So I decided "If I discovered the bug anyway, I might as well go on and report 
it. Perhaps it would help the guys to improve autograd" :)
   About symbolic gradient via NNVM: I'm trying to do exactly that now. 
Unfortunately both NNVM and TVM have rather thin documentation, and to 
understand some things requires digging through C++ code, so the progress is 
slow. Simply don't have much time. Hence the attempt to use mxnet's autograd as 
a shortcut.

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