[pymvpa] cross-validation

[Yaroslav Halchenko]

On Tue, 16 Mar 2010, Yaroslav Halchenko wrote:
> > the design, preprocessing, temporal compression, etc. But if
> > performance with these random "runs" is about the same as
> > partitioning on the actual runs I feel safer moving to a
> > non-run-partitioning scheme.
> that sounds like a good idea!
> Now supported by PyMVPA (in development branch) -- coding in ... 
pushed into yoh/master branch for now... thinking either we may be
should refactor it a bit more... what we got now:

permute_targets

was refactored into a more generic

permute_attr

where you can permute any attribute (by default 'targets' as in new dev
branch) and specifying groupping (good old 'chunks'), which, I
guess, in your scenario should be reverted -- permute chunks attributes
while keeping labels intact.

specification of both attributes also was exposed within MCNullDist
which is the one which likes to permute data a lot ;)

-- 
                                  .-.
=------------------------------   /v\  ----------------------------=
Keep in touch                    // \\     (yoh@|www.)onerussian.com
Yaroslav Halchenko              /(   )\               ICQ#: 60653192
                   Linux User    ^^-^^    [175555]