[Numpy-discussion] Does float16 exist?
David Cournapeau
david at ar.media.kyoto-u.ac.jp
Tue Jan 8 22:42:07 EST 2008
Charles R Harris wrote:
>
>
> On Jan 8, 2008 6:49 PM, Eric Firing <efiring at hawaii.edu
> <mailto:efiring at hawaii.edu>> wrote:
>
> Bill Baxter wrote:
> > On Jan 9, 2008 9:18 AM, Charles R Harris
> <charlesr.harris at gmail.com <mailto:charlesr.harris at gmail.com>> wrote:
> >> On Jan 8, 2008 5:01 PM, Bill Baxter < wbaxter at gmail.com
> <mailto:wbaxter at gmail.com>> wrote:
> >>> On Jan 9, 2008 8:03 AM, Charles R Harris
> <charlesr.harris at gmail.com <mailto:charlesr.harris at gmail.com>>
> >> wrote:
> >>>> On Jan 8, 2008 1:58 PM, Bill Baxter < wbaxter at gmail.com
> <mailto:wbaxter at gmail.com>> wrote:
> >>>>> If you're really going to try to do it, Charles, there's an
> >>>>> implementation of float16 in the OpenEXR toolkit.
> >>>>> http://www.openexr.com/
> >>>>>
> >>>>> Or more precisely it's in the files in the Half/ directory
> of this:
> >>>>>
> >>
> http://download.savannah.nongnu.org/releases/openexr/ilmbase-1.0.1.tar.gz
> >>>>> I don't know if it's IEEE conformant or not (especially
> w.r.t. NaN's
> >>>>> and such) but it should be a good start. The code seems to
> be well
> >>>>> documented.
> >>>> The license looks good, essentially BSD. The code is all C++,
> which is
> >> the
> >>>> obvious way to go for this sort of thing, and I would like to
> stick with
> >> it,
> >>>> but that could lead to build/compatibility problems. I think
> NumPy
> >> itself
> >>>> should really be in C++. Maybe scons can help with the build.
> >>> Yeh, I was just thinking you'd rip out and C-ify the main
> algorithms
> >>> rather than trying to wrap it as-is.
> >> I'd rather not C-ify the thing, I'd rather C++-ify parts of
> NumPy. I note
> >> that MatPlotLab uses C++, so some of the problems must have
> been solved.
>
> A big chunk of C++ in matplotlib has just been replaced, largely
> because
> it was so hard to understand and extend for everyone but its author.
> There is still C++ code as well as C code in mpl. Personally, I
> prefer
> the C.
>
> >
> > If you think that's easier then go for it.
>
> The opinion that C++ would improve numpy is not universal, and has
> been
> discussed.
>
> http://article.gmane.org/gmane.comp.python.numeric.general/13244
> <http://article.gmane.org/gmane.comp.python.numeric.general/13244>
>
>
> Ah, the trick to interfacing C to C++ is to derive the C++ classes
> from the numpy structures and keep the function pointers. Then all the
> offsets would work. I would think the main advantage of C++ would be
> in arithmetic operator overloading and using template classes while
> carefully restricting such things to numbers. Mostly, I would use C++
> inline class methods as shorthand that would compile to what the C
> approach would do. I suppose we could write a python preprocessor that
> would do essentially the same thing; C++ started that way.
Are you suggesting to write a compiler to be able to use operator
overloading ? :) More seriously, the problem of C/C++ is not only at
source level but also at binary level.
David
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