def testAnalyzerWithSplitClassifier(self, clf):
"""Test analyzers in split classifier
"""
# assumming many defaults it is as simple as
mclf = SplitClassifier(clf=clf,
enable_states=['training_confusion',
'confusion'])
sana = mclf.getSensitivityAnalyzer(transformer=Absolute,
enable_states=["sensitivities"])
# Test access to transformers and combiners
self.failUnless(sana.transformer is Absolute)
self.failUnless(sana.combiner is FirstAxisMean)
# and lets look at all sensitivities
# and we get sensitivity analyzer which works on splits
map_ = sana(self.dataset)
self.failUnlessEqual(len(map_), self.dataset.nfeatures)
if cfg.getboolean('tests', 'labile', default='yes'):
for conf_matrix in [sana.clf.training_confusion] \
+ sana.clf.confusion.matrices:
self.failUnless(
conf_matrix.percentCorrect>75,
msg="We must have trained on each one more or " \
"less correctly. Got %f%% correct on %d labels" %
(conf_matrix.percentCorrect,
len(self.dataset.uniquelabels)))
errors = [x.percentCorrect
for x in sana.clf.confusion.matrices]
# XXX
# That is too much to ask if the dataset is easy - thus
# disabled for now
#self.failUnless(N.min(errors) != N.max(errors),
# msg="Splits should have slightly but different " \
# "generalization")
# lets go through all sensitivities and see if we selected the right
# features
# XXX yoh: disabled checking of each map separately since in
# BoostedClassifierSensitivityAnalyzer and
# ProxyClassifierSensitivityAnalyzer
# we don't have yet way to provide transformers thus internal call
# to getSensitivityAnalyzer in _call of them is not parametrized
if 'meta' in clf._clf_internals and len(map_.nonzero()[0])<2:
# Some meta classifiers (5% of ANOVA) are too harsh ;-)
return
for map__ in [map_]: # + sana.combined_analyzer.sensitivities:
selected = FixedNElementTailSelector(
self.dataset.nfeatures -
len(self.dataset.nonbogus_features))(map__)
if cfg.getboolean('tests', 'labile', default='yes'):
self.failUnlessEqual(
list(selected),
list(self.dataset.nonbogus_features),
msg="At the end we should have selected the right features")
def __testFSPipelineWithAnalyzerWithSplitClassifier(self, basic_clf):
#basic_clf = LinearNuSVMC()
multi_clf = MulticlassClassifier(clf=basic_clf)
#svm_weigths = LinearSVMWeights(svm)
# Proper RFE: aggregate sensitivities across multiple splits,
# but also due to multi class those need to be aggregated
# somehow. Transfer error here should be 'leave-1-out' error
# of split classifier itself
sclf = SplitClassifier(clf=basic_clf)
rfe = RFE(sensitivity_analyzer=
sclf.getSensitivityAnalyzer(
enable_states=["sensitivities"]),
transfer_error=trans_error,
feature_selector=FeatureSelectionPipeline(
[FractionTailSelector(0.5),
FixedNElementTailSelector(1)]),
train_clf=True)
# and we get sensitivity analyzer which works on splits and uses
# sensitivity
selected_features = rfe(self.dataset)
