wbailer's weblog

Shogun Machine Learning Toolbox under Win64

wbailer — Tue, 17 Jan 2012 18:21:12 +0000

I’ve used the Shogun Machine Learning Toolbox under Win32, compiled in the Cygwin environment, as described in the documentation. However, for processing a large data set, I needed a 64bit build. As there is currently no 64bit version of Cygwin, I followed the approach described here, using MinGW-w64.

The current version of Cygwin includes MinGW-w64, as well as an appropriate build of pthreads (if needed: compile pthreads as described here).

To configure, pass the MinGW-w64 to the script:

--cc=/usr/bin/x86_64-w64-mingw32-gcc --cflags=-m64
--cxx=/usr/bin/x86_64-w64-mingw32-gcc --cxxflags=-m64

Note: the path needs to be included due to a bug in MinGW-w64, as described on the MinGW-w64 site:

The mingw-w64 toolchain has been officially added to Cygwin mirrors, you can find the basic C toolchain as mingw64-x86_64-gcc-core. The languages enabled are C, Ada, C++, Fortran, Object C and Objective C++. There is a known caveat where calling the compiler directly as “/bin/x86_64-w64-mingw32-gcc” will fail, use “/usr/bin/x86_64-w64-mingw32-gcc” instead and make sure that your PATH variable has “/usr/bin” before “/bin”.

In addition, we add the following libraries to the linker:

-lstdc++ -lmsvcrt -lpthread

As MinGW-w64 has WIN32 defined (in contrast to GCC under Cygwin), there are a number of issues in the Shogun code that need to be fixed (see patch).

Currently, the following issues in the code are still unresolved:

only command line static interface is supported
MemoryMappedFile is not implemented (needs reimplementation based on Win API

After the Shogun library is built, ranlib needs to be run before building the command line interface:

/usr/bin/x86_64-w64-mingw32-ranlib shogun/libshogun.a

The resulting command line application needs the MinGW DLLs in the path. It also has the following limitations:

some strange characters in console (instead of colors)
issues with locale setting in when serialising/parsing files
applications exists on exceptions from SG_ERROR

Programmieren Sie auch noch mit Holzkohle?

wbailer — Mon, 16 Jan 2012 18:56:58 +0000

Had some issues with non-existing defines in the MinGW environment, and came across the following auto-translation.

Original posting:

Clarification: Where “most platforms” refers to platforms with a C99-compliant fscanf/scanf that can handle the hh prefix for char, not just the h prefix for short.

Translation to German:

Erklärung: Wo „die meisten Plattformen“ auf Plattformen mit einem C99-compliant fscanf/scanf sich bezieht, das das hh Präfix für Holzkohle behandeln kann, nicht gerade setzen das h kurz vor.

No doubt, char means Holzkohle, although it could mean Saibling as well (but that’s fishy …).

3D Hype (cont’d)

wbailer — Mon, 03 Oct 2011 18:22:55 +0000

My colleague bought a backpack with 3D mesh:

In contrast to all these conventional flat backpacks …

Spotted the [gu:gl] truck in Graz

wbailer — Wed, 27 Jul 2011 17:39:45 +0000

Transporn

wbailer — Thu, 02 Jun 2011 19:12:34 +0000

According to the title of the page, this seems to be an interesting ride …

Could not delete personal information

wbailer — Fri, 10 Dec 2010 07:28:22 +0000

Message from Excel when saving sheet:

Sounds like a lame excuse on a systemw with 4GB RAM …

The lame bull

wbailer — Sun, 28 Nov 2010 15:33:45 +0000

Obviously the bull has still not recovered enough to move on his own feet:

Tax payers might have suspected that …

Incredible personalisation!

wbailer — Tue, 02 Nov 2010 17:25:56 +0000

The picture in my room in the IBIS hotel in Lyon:

Please stand by while rebooting the ticket machine …

wbailer — Mon, 01 Nov 2010 18:13:59 +0000

Boot log of an ÖBB ticket machine

Austria is everywhere …

wbailer — Tue, 14 Sep 2010 16:35:37 +0000

… according to Google Maps we have occupied the Dutch Film Museum – or is it just the new top-level domain for AmsTerdam?