o o -- you've hit a bug ;) sorry about that I pushed a fix in my (yoh/master) branch in our git repository, but what do you run it on (OS?) and from (package, git repository, source tarball)? would you be able to use pymvpa directly from the sources in git repository?
More about fix: since this moment we have 2 separate kinds of analyzers (for regular mapped or featureselection classifiers), but that is irrelevant at this user level. But also I've added a state variable clf_sensitivities for sensitivity analyzers of proxy-classifiers, so now, in your case I have: clf=MappedClassifier(LinearCSVMC(), SVDMapper()) sensana=clf.getSensitivityAnalyzer() sensana.states.enable(['clf_sensitivities']) sens=sensana(dataset) print sens.shape print sensana.clf_sensitivities.shape and if it is ran as a part of our svdclf example on sample dataset I see: Dataset / float32 216 x 530 uniq: 12 chunks 2 labels (530,) (216, 1) so, sens itself is mapped back into original feature space, but I am not sure what that would actually mean here (interpretations could vary) since it effectively replaces (IIRC) singular values with sensitivites, ie changes contribution of each of SVD components. but sensana.clf_sensitivities is smth easy to make sense of -- that would be the sensitivities of the 'slave' classifier (ie LinearCSVMC) which was ran on remapped data... from it you could assess what dimensions of eigenspace are more influential on classification than the others On Thu, 05 Feb 2009, Sergi Costafreda wrote: > Hi all > Just starting with PyMVPA - thanks for a great tool! > I am trying to obtain a sensitivity analysis for a SVD+SVM mapped > classifier, by adapting the code of sensanas.py. When I try to run > (1) >>> clf=MappedClassifier(LinearCSVMC(), SVDMapper()) > (2) >>> sensana=clf.getSensitivityAnalyzer() > (3) >>> sens=sensana(data) > Line (2) returns the following error: > >>> "AttributeError: 'MappedClassifier' object has no attribute > '_MappedClassifier__clf'" > I'd be grateful for any help with this! > Best, > Sergi > _______________________________________________ > Pkg-ExpPsy-PyMVPA mailing list > [email protected] > http://lists.alioth.debian.org/mailman/listinfo/pkg-exppsy-pymvpa -- Yaroslav Halchenko Research Assistant, Psychology Department, Rutgers-Newark Student Ph.D. @ CS Dept. NJIT Office: (973) 353-1412 | FWD: 82823 | Fax: (973) 353-1171 101 Warren Str, Smith Hall, Rm 4-105, Newark NJ 07102 WWW: http://www.linkedin.com/in/yarik _______________________________________________ Pkg-ExpPsy-PyMVPA mailing list [email protected] http://lists.alioth.debian.org/mailman/listinfo/pkg-exppsy-pymvpa
