mk-61 commented on pull request #20635:
URL: https://github.com/apache/incubator-mxnet/pull/20635#issuecomment-962546584


   > The number of environment variables seems a bit excessive to me (although 
I like that a lot more than precompiler statements). Is there no neater way? I 
can't imagine most people playing around with a dozen environment variables 
just to get the desired result. Also, this basically makes the code untestable 
due to the sheer number of combinations.
   
   It is expected that in vast majority of cases users can just leave all the 
new environment variables alone - defaults have been chosen with care. However, 
in some corner cases it can be useful to have a bit more control, so I was 
weary of just hard-coding the defaults. Please note that not all these 
variables are new - in some cases I was using already existing ones.


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