[GitHub] [incubator-mxnet] aaronmarkham commented on issue #14202: [Doc] Start the tutorials for MKL-DNN backend

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aaronmarkham commented on issue #14202: [Doc] Start the tutorials for MKL-DNN backend
URL: https://github.com/apache/incubator-mxnet/pull/14202#issuecomment-471022048
 
 
   Sorry, I thought I already replied. We can do the docs update in a separate PR, but I wanted to flag that it should be done soon.
   
   I was under the impression that MKL-DNN was on by default. I guess this must be in the build from source route then? 
   
   I ran into those [subprocess issues](https://github.com/apache/incubator-mxnet/issues/13875). Should this be mentioned somewhere? Add a mention of `KMP_INIT_AT_FORK=false` - or maybe that needs to be thrown into the makefile to prevent problems?
   
   Help me untangle what is what.
   If you have already installed MKL and you `pip install mxnet`, what happens?
   If you have already installed MKL-DNN and you `pip install mxnet`, what happens?
   If you have already installed both MKL and MKL-DNN and you `pip install mxnet`, what happens?
   If you have not installed either and you `pip install mxnet-mkl`, what happens?
   If you have not installed either and you `pip install mxnet`, what happens? 
   If you have already installed MKL and you build from source (with default flags), what happens? I reported this issue where it doesn't work (on Windows): https://github.com/apache/incubator-mxnet/issues/11769
   If you have already installed MKL-DNN and you build from source (with default flags), what happens?
   What other variations pop up when we consider Apple or Linux or Edge?

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