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From Naveen Swamy <mnnav...@gmail.com>
Subject Re: Include MKLDNN into default mxnet pip package
Date Thu, 22 Nov 2018 02:47:53 GMT
Tao,

You are right there are many submodules in 3rd party. We have to start
somewhere and I believe this one is a good candidate to start with. This is
not to cater to release of MXNet or to tie them with the releases of the
submodules but instead to pick only stable releases and not to pick up
bleeding edge commits from the tip of the master, this gives us confidence
in the submodule that MXNet users are depending on that especially if we
make MKLDNN the default.

Good to know it is known already as a regression.Alex has created this
issue https://github.com/apache/incubator-mxnet/issues/13369, please add
details and link the corresponding issue in MKLDNN(I couldn't find).

-Naveen

On Wed, Nov 21, 2018 at 6:04 PM Lv, Tao A <tao.a.lv@intel.com> wrote:

> Here are my answers for the questions from Kellen and Naveen about
> MKL-DNN. It doesn't mean that I'm supportive for making MKL-DNN default
> here.
>
> @Kellen,
>
> FYI, here is a list for those platforms which are officially supported by
> MKL-DNN.
> https://github.com/intel/mkl-dnn#system-requirements
>
> Most of computation intensive kernels in MKL-DNN are JITed. So they are
> supposed to generate code according to the platform during runtime. For
> non-JIT code in MKL-DNN, same as other code in MXNet, it will generate
> instructions according to the options/flags of compiler. We can set
> -DARCH_OPT_FLAGS when build MKL-DNN to avoid optimization for compiling
> machine. That's exactly what we are doing for MKL-DNN build in MXNet. Even
> without MKL-DNN, I noticed there were issues about illegal instructions of
> MXNet when users import the pip package on a lower end machine which
> probably only supports SSE.
>
> @Naveen,
>
> The LSTM issue has already been identified as a regression from the recent
> version of MKL-DNN. Hopefully it will be fixed soon with a new update of
> MKL-DNN.
>
> MXNet has many submodule dependencies under the 3rd party folder. Seems we
> don't require release versions for most of these dependencies. The release
> period of MKL-DNN and MXNet are not matched very well. I think it would be
> a risk for MXNet release if it hardly depends on the release of a
> submodule, no need to say depends on the releases of all submodules.
>
> -tao
>
> -----Original Message-----
> From: Naveen Swamy [mailto:mnnaveen@gmail.com]
> Sent: Thursday, November 22, 2018 9:08 AM
> To: dev@mxnet.incubator.apache.org
> Cc: dev@mxnet.apache.org
> Subject: Re: Include MKLDNN into default mxnet pip package
>
> Hi Alex,
>
> Thanks for promptly running the numbers on AMD and reporting here.
>
> Can you please update the AMD numbers here for posterity
> https://cwiki.apache.org/confluence/display/MXNET/MXNet+with+Intel+MKL-DNN+-+Performance+Benchmarking
> ?
>
> are there any outstanding issues when MKLDNN is enabled? from my offline
> conversation I am briefly aware performance issues with LSTM, is there an
> GitHub issue for it?
>
> MKLDNN is a submodule dependency, are we pulling the latest commit or
> releases  ? If not we should move to releases before we make it a default.
> Ideally we should use platform specific distributions (-dev packages) at
> least we should rely on well tested releases.
>
>
> Thanks, Naveen
>
> On Wed, Nov 21, 2018 at 4:55 PM Zai, Alexander <alexzai@amazon.com.invalid
> >
> wrote:
>
> > AMD benchmarks have been published. We are seeing a x15.8 speedup with
> > Resnet50 (batch size 32) on AWS's new m5a.24xlarge machine. With a
> > smaller network (Mobilenet - batch size 32) the speedup is more
> > significant at x38.7. Let's have a vote to see if the PR to have
> > MKLDNN enabled by default
> > (https://github.com/apache/incubator-mxnet/pull/12591) can be merged
> > before 1.4.0 release.
> >
> > On 10/19/18, 9:17 AM, "Pedro Larroy" <pedro.larroy.lists@gmail.com>
> > wrote:
> >
> >     I did  pip install mxnet-mkl==1.3.1b20181018 on an AMD Ryzen 1950X
> > and unit
> >     tests are passing.
> >
> >     Is this build using AVX512?  in /proc/cpuinfo I see only "avx" flag.
> >     There's no "avx2" like on recent intel cpus.
> >
> >     Pedro.
> >
> >     On Fri, Oct 19, 2018 at 5:12 PM Hagay Lupesko <lupesko@gmail.com>
> > wrote:
> >
> >     > Awesome collaborative effort across many contributors and
> companies!
> >     >
> >     > The boost is impressive and for MXNet users to get this boost
> > "out of the
> >     > box" is a great benefit and makes MXNet an even better choice.
> >     >
> >     > Alex - can you clarify whether there are any down sides with
> > regards to
> >     > noon AVX-512 architectures, AMD CPUs, etc? Will it gracefully
> > fallback?
> >     >
> >     > Hagay
> >     >
> >     >
> >     > On Fri, Oct 19, 2018, 15:46 Sergio Fernández <wikier@apache.org>
> > wrote:
> >     >
> >     > > If there is no downside on platforms not supporting AVX512
> > instructions,
> >     > > then +1
> >     > >
> >     > >
> >     > > On Wed, Oct 17, 2018, 14:10 Alex Zai <azai91@gmail.com> wrote:
> >     > >
> >     > > > Hey all,
> >     > > > We have been working hard these past few months to integrate
> and
> >     > > stabilize
> >     > > > Intel’s MKLDNN deep learning CPU accelerator into Mxnet and
> > have made
> >     > > > incredible progress. On CPUs with AVX512 instructions (such
> > as
> > c5.18x)
> >     > we
> >     > > > have seen performance increase up to 12x and on other
> > platforms (Macs,
> >     > > > AVX2) we seen a speedup of 1.5+. Full list of benchmarks can
> > be found
> >     > > here
> >     > > > (
> >     > > >
> >     > >
> >     >
> >
> https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=95650764
> >     > > >  and https://github.com/apache/incubator-mxnet/pull/12591).
> >     > > >
> >     > > > Currently, using this accelerator requires the developer to
> > either pip
> >     > > > install the mxnet-mkl version of mxnet or to build it
> > themselves from
> >     > > > source. Given that we should try to provide the best
> > performance "out
> >     > of
> >     > > > the box” with mxnet we should include this in the default
> build.
> > The
> >     > > mkldnn
> >     > > > library is included with in the pip package build so it does
> not
> >     > require
> >     > > an
> >     > > > external dependency.
> >     > > >
> >     > > > There were concerns that MKLDNN could cause regressions on
> > certain
> >     > > > platforms (as it did with the tensorflow version a while
> > back); but we
> >     > > > added a env flag (MXNET_MKLDNN_ENABLED) that allows users to
> > turn of
> >     > this
> >     > > > feature during runtime. Please bring up any other concerns
> > you may have
> >     > > and
> >     > > > your thoughts on including this accelerator in the default
> build.
> >     > > >
> >     > > > Best,
> >     > > > Alex
> >     > > >
> >     > >
> >     >
> >
> >
> >
>

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