/usr/include/shogun/features/ is in libshogun-dev 3.2.0-7.3build4.
This file is owned by root:root, with mode 0o755.
..
/usr/include/shogun/features/Alphabet.h
/usr/include/shogun/features/AttributeFeatures.h
/usr/include/shogun/features/BinnedDotFeatures.h
/usr/include/shogun/features/CombinedDotFeatures.h
/usr/include/shogun/features/CombinedFeatures.h
/usr/include/shogun/features/DataGenerator.h
/usr/include/shogun/features/DenseFeatures.h
/usr/include/shogun/features/DenseSubsetFeatures.h
/usr/include/shogun/features/DirectorDotFeatures.h
/usr/include/shogun/features/DotFeatures.h
/usr/include/shogun/features/DummyFeatures.h
/usr/include/shogun/features/ExplicitSpecFeatures.h
/usr/include/shogun/features/FKFeatures.h
/usr/include/shogun/features/FactorGraphFeatures.h
/usr/include/shogun/features/FeatureTypes.h
/usr/include/shogun/features/Features.h
/usr/include/shogun/features/HashedDenseFeatures.h
/usr/include/shogun/features/HashedDocDotFeatures.h
/usr/include/shogun/features/HashedSparseFeatures.h
/usr/include/shogun/features/HashedWDFeatures.h
/usr/include/shogun/features/HashedWDFeaturesTransposed.h
/usr/include/shogun/features/ImplicitWeightedSpecFeatures.h
/usr/include/shogun/features/LBPPyrDotFeatures.h
/usr/include/shogun/features/LatentFeatures.h
/usr/include/shogun/features/MatrixFeatures.h
/usr/include/shogun/features/PolyFeatures.h
/usr/include/shogun/features/RandomFourierDotFeatures.h
/usr/include/shogun/features/RandomKitchenSinksDotFeatures.h
/usr/include/shogun/features/RealFileFeatures.h
/usr/include/shogun/features/SNPFeatures.h
/usr/include/shogun/features/SparseFeatures.h
/usr/include/shogun/features/SparsePolyFeatures.h
/usr/include/shogun/features/StringFeatures.h
/usr/include/shogun/features/StringFileFeatures.h
/usr/include/shogun/features/Subset.h
/usr/include/shogun/features/SubsetStack.h
/usr/include/shogun/features/TOPFeatures.h
/usr/include/shogun/features/WDFeatures.h
/usr/include/shogun/features/streaming/
/usr/include/shogun/features/streaming/StreamingDenseFeatures.h
/usr/include/shogun/features/streaming/StreamingDotFeatures.h
/usr/include/shogun/features/streaming/StreamingFeatures.h
/usr/include/shogun/features/streaming/StreamingHashedDenseFeatures.h
/usr/include/shogun/features/streaming/StreamingHashedDocDotFeatures.h
/usr/include/shogun/features/streaming/StreamingHashedSparseFeatures.h
/usr/include/shogun/features/streaming/StreamingSparseFeatures.h
/usr/include/shogun/features/streaming/StreamingStringFeatures.h
/usr/include/shogun/features/streaming/StreamingVwFeatures.h
/usr/include/shogun/features/streaming/generators/
/usr/include/shogun/features/streaming/generators/GaussianBlobsDataGenerator.h
/usr/include/shogun/features/streaming/generators/MeanShiftDataGenerator.h