/usr/include/shogun/converter/ is in libshogun-dev 3.2.0-7.5.
This file is owned by root:root, with mode 0o755.
..
/usr/include/shogun/converter/Converter.h
/usr/include/shogun/converter/DiffusionMaps.h
/usr/include/shogun/converter/EmbeddingConverter.h
/usr/include/shogun/converter/FactorAnalysis.h
/usr/include/shogun/converter/HashedDocConverter.h
/usr/include/shogun/converter/HessianLocallyLinearEmbedding.h
/usr/include/shogun/converter/Isomap.h
/usr/include/shogun/converter/KernelLocallyLinearEmbedding.h
/usr/include/shogun/converter/LaplacianEigenmaps.h
/usr/include/shogun/converter/LinearLocalTangentSpaceAlignment.h
/usr/include/shogun/converter/LocalTangentSpaceAlignment.h
/usr/include/shogun/converter/LocalityPreservingProjections.h
/usr/include/shogun/converter/LocallyLinearEmbedding.h
/usr/include/shogun/converter/ManifoldSculpting.h
/usr/include/shogun/converter/MultidimensionalScaling.h
/usr/include/shogun/converter/NeighborhoodPreservingEmbedding.h
/usr/include/shogun/converter/StochasticProximityEmbedding.h
/usr/include/shogun/converter/TDistributedStochasticNeighborEmbedding.h
/usr/include/shogun/converter/ica/
/usr/include/shogun/converter/ica/FFSep.h
/usr/include/shogun/converter/ica/FastICA.h
/usr/include/shogun/converter/ica/ICAConverter.h
/usr/include/shogun/converter/ica/Jade.h
/usr/include/shogun/converter/ica/JediSep.h
/usr/include/shogun/converter/ica/SOBI.h
/usr/include/shogun/converter/ica/UWedgeSep.h