[GitHub] [incubator-mxnet] dbsxdbsx opened a new issue #14335: Question on installation and use of MKLDNN

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dbsxdbsx opened a new issue #14335: Question on installation and use of MKLDNN
URL: https://github.com/apache/incubator-mxnet/issues/14335
 
 
   I am trying to build mxnet from source to use with python and C++ on win10_64, and with MKL+MKLDNN as backbone. 
   
   Question on installation:
   With the latest `CMakeList.txt` in mxnet source，I  see:
   ```
   mxnet_option(USE_MKL_IF_AVAILABLE "Use MKL if found" ON)
   mxnet_option(USE_MKLML_MKL        "Use MKLDNN variant of MKL (if MKL found)" ON IF USE_MKL_IF_AVAILABLE AND (NOT APPLE))
   mxnet_option(USE_MKLDNN           "Use MKLDNN variant of MKL (if MKL found)" ON IF USE_MKL_IF_AVAILABLE AND (NOT APPLE) AND (NOT MSVC) AND (CMAKE_HOST_SYSTEM_PROCESSOR STREQUAL "x86_64") AND (NOT CMAKE_CROSSCOMPILING))
   ```
   Here, I know MKL  is the basic intel lib with can be installed alone. `MKLML_MKL` is a sub module of MKL. `MKLDNN` is lib optimized for deep learning especially,  it can be used alone or with MKL( FULL INSTALLTION or _MKLML_MKL) or even other blas lib. And from Intel offically, seems MKL(FUll Installation)+MKLDNN would give the best performance---that is what I want to try. And I've FULL installed MKL  manually.
   
   Q1: why the explanation of `USE_MKLML_MKL ` and `USE_MKLDNN ` are all the same, it is confusing. I did found an issue talking about this, but it is still confusing.
   
   Q2: from office tutorial of [gluonCV with C++](https://github.com/dmlc/gluon-cv/tree/master/scripts/deployment/cpp-inference), seems  it is feasible to build with MKL+MKLDNN in cmd command. But with CMake Gui,  USE_MKLDNN is forbidden, as it need `(NOT MSVC) `. WHY?
   
   Q3: To build MKLDNN with MKL(full installed but NOT submodule),  with mxnet official tutorial [here](https://github.com/apache/incubator-mxnet/blob/master/MKLDNN_README.md), I need to:
   `Copy file 3rdparty/mkldnn/config_template.vcxproj to incubator-mxnet root.`But I only found `config_template.vcxproj.user`, does that mean I could build mxnet with MKL+MKLDNN after I copy it to the root path of mxnet but with NO selection of `USE_MKLDNN ` when configuring with CMAKE Gui?
   
   About usage of MKL:
   I know mxnet is just released a new version 1.4, with some update of  MKL(+DNN). But after looking  into tutorial [MKLDNN_README](https://cwiki.apache.org/confluence/display/MXNET/MXNet+Graph+Optimization+and+Quantization+based+on+subgraph+and+MKL-DNN), With MKL+MKLDNN built with mxnet 1.4,I wonder
   Q1: does it  mean that MKL+MKLDNN is automatically  used in cpu mode with net graph BUT NOT include  `SUBGRAPH`  without setting an OS variable `MXNET_SUBGRAPH_BACKEND=MKLDNN`?

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