On Sat, May 19, 2018 at 12:15:21PM +0000, Lumin wrote: > Thank you for this bug report. I'll take a look into it. > > Sébastien, I found no code in caffe that is specific to any BLAS > implementation. Do you have any idea about the reported result variation > between netlib blas and openblas? Or do they have different level of > numerical stability assurance?
I don’t have any specific idea about the cause of the problem. But I wouldn’t be surprised if the different BLAS implementations had different numerical stability properties is some corner cases, because they do not implement the algorithms in the same way. Best, > > Package: caffe-cpu > > Severity: important > > > > Dear Maintainer, > > > > I'm getting very different results in cpu mode compared to gpu mode, when > > using the libblas3 (version 3.7.0-2) package. > > After installing the libopenblas-base package (version 0.2.19-3) the > > problems disappeared. I don't know whether > > this is a dependency problem of the package or it is a known problem in > > libblas3. I was able to uninstall and install > > libopenblas-base while libblas3 was still being installed, which is a > > little bit confusing to me. > > > > Note that I reported the bug initially here: > > https://github.com/twhui/MSG-Net/issues/2 > > > > Note also that this bug has been found with a recompiled package with > > matlab support enabled. I used this howto > > https://github.com/BVLC/caffe/blob/master/docs/install_apt_debian.md, and > > changed only the matlab options. However, > > I don't think that the behaviour is visible in matlab only, though I didn't > > try this. > > > > Kind Regards > > Christoph > > > > -- System Information: > > Debian Release: 9.4 > > APT prefers stable > > APT policy: (1000, 'stable'), (900, 'stable'), (500, 'stable-updates') > > Architecture: amd64 (x86_64) > > Foreign Architectures: i386 > > > > Kernel: Linux 4.9.0-6-amd64 (SMP w/8 CPU cores) > > Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8), > > LANGUAGE=en_US:en (charmap=UTF-8) > > Shell: /bin/sh linked to /bin/dash > > Init: systemd (via /run/systemd/system) > > > > Versions of packages caffe-cpu depends on: > > pn caffe-tools-cpu <none> > > ii libblas3 [libblas.so.3] 3.7.0-2 > > pn libcaffe-cpu1 <none> > > ii libopenblas-base [libblas.so.3] 0.2.19-3 > > pn python3-caffe-cpu <none> > > > > caffe-cpu recommends no packages. > > > > Versions of packages caffe-cpu suggests: > > pn caffe-doc <none> > > pn libcaffe-cpu-dev <none> > > -- ⢀⣴⠾⠻⢶⣦⠀ Sébastien Villemot ⣾⠁⢠⠒⠀⣿⡁ Debian Developer ⢿⡄⠘⠷⠚⠋⠀ http://sebastien.villemot.name ⠈⠳⣄⠀⠀⠀⠀ http://www.debian.org
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