/usr/include/shogun/classifier/ is in libshogun-dev 3.2.0-7.3build4.
This file is owned by root:root, with mode 0o755.
..
/usr/include/shogun/classifier/AveragedPerceptron.h
/usr/include/shogun/classifier/FeatureBlockLogisticRegression.h
/usr/include/shogun/classifier/GaussianProcessBinaryClassification.h
/usr/include/shogun/classifier/LDA.h
/usr/include/shogun/classifier/LPBoost.h
/usr/include/shogun/classifier/LPM.h
/usr/include/shogun/classifier/NearestCentroid.h
/usr/include/shogun/classifier/Perceptron.h
/usr/include/shogun/classifier/PluginEstimate.h
/usr/include/shogun/classifier/mkl/
/usr/include/shogun/classifier/mkl/MKL.h
/usr/include/shogun/classifier/mkl/MKLClassification.h
/usr/include/shogun/classifier/mkl/MKLMulticlass.h
/usr/include/shogun/classifier/mkl/MKLMulticlassGLPK.h
/usr/include/shogun/classifier/mkl/MKLMulticlassGradient.h
/usr/include/shogun/classifier/mkl/MKLMulticlassOptimizationBase.h
/usr/include/shogun/classifier/mkl/MKLOneClass.h
/usr/include/shogun/classifier/svm/
/usr/include/shogun/classifier/svm/CPLEXSVM.h
/usr/include/shogun/classifier/svm/GNPPLib.h
/usr/include/shogun/classifier/svm/GNPPSVM.h
/usr/include/shogun/classifier/svm/GPBTSVM.h
/usr/include/shogun/classifier/svm/LibLinear.h
/usr/include/shogun/classifier/svm/LibSVM.h
/usr/include/shogun/classifier/svm/LibSVMOneClass.h
/usr/include/shogun/classifier/svm/MPDSVM.h
/usr/include/shogun/classifier/svm/NewtonSVM.h
/usr/include/shogun/classifier/svm/OnlineLibLinear.h
/usr/include/shogun/classifier/svm/OnlineSVMSGD.h
/usr/include/shogun/classifier/svm/QPBSVMLib.h
/usr/include/shogun/classifier/svm/SGDQN.h
/usr/include/shogun/classifier/svm/SVM.h
/usr/include/shogun/classifier/svm/SVMLin.h
/usr/include/shogun/classifier/svm/SVMOcas.h
/usr/include/shogun/classifier/svm/SVMSGD.h
/usr/include/shogun/classifier/svm/WDSVMOcas.h
/usr/include/shogun/classifier/vw/
/usr/include/shogun/classifier/vw/VowpalWabbit.h
/usr/include/shogun/classifier/vw/VwEnvironment.h
/usr/include/shogun/classifier/vw/VwLearner.h
/usr/include/shogun/classifier/vw/VwParser.h
/usr/include/shogun/classifier/vw/VwRegressor.h
/usr/include/shogun/classifier/vw/cache/
/usr/include/shogun/classifier/vw/cache/VwCacheReader.h
/usr/include/shogun/classifier/vw/cache/VwCacheWriter.h
/usr/include/shogun/classifier/vw/cache/VwNativeCacheReader.h
/usr/include/shogun/classifier/vw/cache/VwNativeCacheWriter.h
/usr/include/shogun/classifier/vw/learners/
/usr/include/shogun/classifier/vw/learners/VwAdaptiveLearner.h
/usr/include/shogun/classifier/vw/learners/VwNonAdaptiveLearner.h
/usr/include/shogun/classifier/vw/vw_common.h
/usr/include/shogun/classifier/vw/vw_constants.h
/usr/include/shogun/classifier/vw/vw_example.h
/usr/include/shogun/classifier/vw/vw_label.h
/usr/include/shogun/classifier/vw/vw_math.h