Thank you for the response Yaroslav, Well the snippet probabilities = clf.ca.probabilities is only an example that I've build to reveal the exception (I didn't think is a version problem, I had 2.0.1 mvpa)!! BTW I was quite sure that the problem relied on the cross validation :)! I would like to gather all the predictions/probabilities for each cv fold. This why using the ca 'training_stats' during the definition of the classifier, I had the probabilities of the samples during training?
So I can't have access to every cv fold probabilities/predictions using CrossValidation object? Or I need a manual CrossValidation (and sometimes a Feature Selection)? Thank you! Roberto On 27 November 2012 15:49, Yaroslav Halchenko <[email protected]> wrote: > > On Tue, 27 Nov 2012, Roberto Guidotti wrote: > > > Dear all, > > I've a problem with classifier's conditional attributes (it is > possibly > > due to a bad command understanding, by myself, I admit!): > > clf = LinearCSVMC(C=1, probability=1, enable_ca=['probabilities']) > > cvte = CrossValidation(clf, NFoldPartitioner(cvtype = 1), > > enable_ca=['stats', 'repetition_results']) > > train_err = cvte(evds) > > When I try to see inside the conditional attributes of my trained > > classifier clf with the command below > > probabilities = clf.ca.probabilities > > odd enough above snippet (with probabilities = clf.ca.probabilities) > works for me just fine. but -- this way you are obtaining > probabilities only for the last cross-validation fold. what is the goal > -- to get them for every CV fold? (then CrossValidation should get a > callback to harvest them) or on all the data (then you would need to > "clf.train(evds); clf.predict(evds);" and then gather > clf.ca.probabilities > > > I have this exception > > UnknownStateError: Unknown yet value of probabilities > > Instead using a classifier defined as: > > clf = LinearCSVMC(C=1, probability=1, enable_ca=['probabilities', > > 'training_stats']) > > I could store my probabilities. > > Am I doing all the things well? > > Thank you > > Roberto > -- > Yaroslav O. Halchenko > Postdoctoral Fellow, Department of Psychological and Brain Sciences > 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 >
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