[Numpy-discussion] ANN: Numpy 1.10.0rc1 released.

[Sebastian Berg]

On Do, 2015-09-24 at 03:26 -0700, Stefan van der Walt wrote:
> On 2015-09-24 00:17:33, Jens Jørgen Mortensen <jensj at fysik.dtu.dk> wrote:
> > jensj at jordan:~$ python
> > Python 2.7.9 (default, Apr  2 2015, 15:33:21)
> > [GCC 4.9.2] on linux2
> > Type "help", "copyright", "credits" or "license" for more information.
> >  >>> import numpy as np
> >  >>> a = np.zeros((2, 2, 2))
> >  >>> b = np.zeros((2, 2, 2))
> >  >>> a[0, 0] = 7
> >  >>> b[0, 0] = 6
> >  >>> np.vdot(a[:, :, 0], b[:, :, 0]).real
> > 84.0
> >  >>> np.__version__
> > '1.10.0rc1'
> >
> > The result should be 42.  This is on Ubuntu 15.04.
> 
> The input is not supposed to be matrices—but the docstring specifically
> states that those should then be ravelled, so this is indeed a bug.
> 
> If I bisected correctly, the problematic change is this one:
> 

Yeah, vdot uses `ravel`. That is correct, but it should only use it
after making sure the input is C-order, or make sure the output of ravel
is C-order (vdot was changed too in the mean time).

So the fix will be adding the contiguity check in vdot.

- Sebastian

> 
> commit 44877b36870ec2a0505c536a30b9fbf06a414c17
> Author: Sebastian Berg <sebastian at sipsolutions.net>
> Date:   Wed Sep 3 18:33:06 2014 +0200
> 
>     ENH: Allow ravel to reshape in place when possible
>     
>     This fixes a lot of corner cases in reshape 'K' when the array
>     is not contiguous in the first place, it was previously never
>     ravelled in place.
>     
>     Closes gh-5033
> 
> 
> Stéfan
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