On Wed, Aug 18, 2010 at 12:18 AM, Christoph Gohlke <[email protected]> wrote:
> > > On 8/17/2010 9:56 PM, Charles R Harris wrote: > > > > > > On Tue, Aug 17, 2010 at 9:11 PM, Christoph Gohlke <[email protected] > > <mailto:[email protected]>> wrote: > > > > > > > > On 8/17/2010 1:02 PM, Charles R Harris wrote: > > > > > > > > > On Tue, Aug 17, 2010 at 1:38 PM, Christoph Gohlke < > [email protected] > > <mailto:[email protected]> > > > <mailto:[email protected] <mailto:[email protected]>>> wrote: > > > > > > > > > > > > On 8/17/2010 8:23 AM, Ralf Gommers wrote: > > > > > > I am pleased to announce the availability of the second > > beta of > > > NumPy > > > 1.5.0. This will be the first NumPy release to include > > support for > > > Python 3, as well as for Python 2.7. > > > > > > Please try this beta and report any problems on the NumPy > > > mailing list. > > > Especially with Python 3 testing will be very useful. On > Linux > > > and OS X > > > building from source should be straightforward, for > > Windows a binary > > > installer is provided. There is one important known issue > > on Windows > > > left, in fromfile and tofile (ticket 1583). > > > > > > Binaries, sources and release notes can be found at > > > https://sourceforge.net/projects/numpy/files/ > > > <https://sourceforge.net/projects/numpy/files/> > > > > > > Enjoy, > > > Ralf > > > > > > > > > NumPy 1.5.0 beta 2 built with msvc9/mkl for Python 2.7 and 3.1 > (32 > > > and 64 bit) still reports many (> 200) warnings and three > > known test > > > failures/errors. Nothing serious, but it would be nice to > clean up > > > before the final release. > > > > > > The warnings are of the type "Warning: invalid value > > encountered in" > > > for the functions reduce, fmax, fmin, logaddexp, maximum, > greater, > > > less_equal, greater_equal, absolute, and others. I do not see > > any of > > > these warnings in the msvc9 builds of numpy 1.4.1. > > > > > > > > > The warnings were accidentally turned off for earlier versions of > > Numpy. > > > I expect these warnings are related to nans and probably due to > > problems > > > with isnan or some such. Can you take a closer look? The fmax > function > > > should be easy to check out. > > > > > > <sniip> > > > > > > Chuck > > > > > > > > > Thanks for the hint. Warnings are issued in the test_umath test_*nan* > > functions. The problem can be condensed to this statement: > > > > > >> numpy.array([numpy.nan]) > 0 > > Warning: invalid value encountered in greater > > array([False], dtype=bool) > > > > > > When using msvc, ordered comparisons involving NaN raise an exception > > [1], i.e. set the 'invalid' x87 status bit, which leads to the > warning > > being printed. I don't know if this violates IEEE 754 or C99 > standards > > but it does not happen with the gcc builds. Maybe > > seterr(invalid='ignore') could be added to the test_*nan* functions? > > > > [1] > http://msdn.microsoft.com/en-us/library/e7s85ffb%28v=VS.90%29.aspx > > > > > > OK, this does seem to be the standard. For instance > > > > The isless macro determines whether its first argument is less than its > > second > > argument. The value of isless(x, y) is always equal to (x) < (y); > however, > > unlike (x) < (y), isless(x, y) does not raise the ‘‘invalid’’ > floating-point > > exception when x and y are unordered. > > > > There are other macros for the rest of the comparisons. Can you check if > > MSVC has these macros available? > > > > MSVC doesn't have these macros. It should not be too difficult to define > them according to > > http://code.google.com/p/v8/source/browse/branches/bleeding_edge/src/platform-win32.cc > > int isless(double x, double y) { > return isnan(x) || isnan(y) ? 0 : x < y; > } > > > int isgreater(double x, double y) { > return isnan(x) || isnan(y) ? 0 : x > y; > } > > Looks like we should just rewrite the ufuncs. Having these checks will slow things down a bit but it is probably the easiest way to make things portable without doing a lot of complicated work to determine what the platform does. However, this means that numpy won't ever set exceptions when nans are encountered and this is a design decision we should make up front. Chuck
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