On Mon, 04 Nov 2013, Taku Ito wrote: > You're right, thank you, I was looking through the incorrect data set - My > original data set (the one I wrote to right after fmri_dataset), has the > following mappers: > In [104]: data[1].a.mapper > Out[104]: ChainMapper(nodes=[FlattenMapper(shape=(59, 69, 59), > auto_train=True, space='voxel_indices'), > StaticFeatureSelection(dshape=(240189,), slicearg=array([False, False, > False, ..., False, False, False], dtype=bool))]) > However, after this data set, I constructed a sub-data set by just > selecting certain samples with the target values I wanted, splitting the > datasets accordingly, and then reconcatenating them into a new data set.
that is where probably the mapper got "lost" ;-) > (I then ran the ZScoreMapper() on this new data set, since I only wanted > to Z score the samples I was going to use in the searchlight analysis.) > In [105]: data_stack[1].a.mapper > Out[105]: ZScoreMapper() > Finally, I ran the searchlight analysis which resulted in: > In [106]: res[1].a.mapper > Out[106]: ZScoreMapper() > Would it then be accurate for me to simply use the ChainMapper from the > original data set (exclude the ZScoreMapper from the map2nifti function), > like so: > map2nifti(data[1], res[1].samples) yes -- should work > Or would it be more accurate of me to construct a new ChainMapper which > includes the ZScoreMapper, append it to the ChainMapper of the original > data set, and then re-attribute it to the searchlight output data set? nah -- probably not needed/not worth the hassle. If you did no action which would change 'features' origin, taking original dataset would be the easiest and most straightforward > Thanks again! This has been a huge hassle, and you've been a great help > (though I realize that much of the troubles were my own carelessness > now... Sorry!). well -- we should bear our portion of blame here too ;) may be we should issue a warning whenever hstacking/etc datasets with the mappers so they do not get lost without notice (actually current master might keep them... I would need to check). Cheers, -- Yaroslav O. Halchenko, Ph.D. http://neuro.debian.net http://www.pymvpa.org http://www.fail2ban.org Senior Research Associate, Psychological and Brain Sciences Dept. Dartmouth College, 419 Moore Hall, Hinman Box 6207, Hanover, NH 03755 Phone: +1 (603) 646-9834 Fax: +1 (603) 646-1419 WWW: http://www.linkedin.com/in/yarik _______________________________________________ Pkg-ExpPsy-PyMVPA mailing list [email protected] http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/pkg-exppsy-pymvpa
