/usr/include/shogun/structure/ is in libshogun-dev 3.2.0-7.3build4.
This file is owned by root:root, with mode 0o755.
..
/usr/include/shogun/structure/BeliefPropagation.h
/usr/include/shogun/structure/BmrmStatistics.h
/usr/include/shogun/structure/CCSOSVM.h
/usr/include/shogun/structure/DirectorStructuredModel.h
/usr/include/shogun/structure/DisjointSet.h
/usr/include/shogun/structure/DualLibQPBMSOSVM.h
/usr/include/shogun/structure/DynProg.h
/usr/include/shogun/structure/Factor.h
/usr/include/shogun/structure/FactorGraph.h
/usr/include/shogun/structure/FactorGraphModel.h
/usr/include/shogun/structure/FactorType.h
/usr/include/shogun/structure/HMSVMModel.h
/usr/include/shogun/structure/IntronList.h
/usr/include/shogun/structure/MAPInference.h
/usr/include/shogun/structure/MulticlassModel.h
/usr/include/shogun/structure/MulticlassSOLabels.h
/usr/include/shogun/structure/Plif.h
/usr/include/shogun/structure/PlifArray.h
/usr/include/shogun/structure/PlifBase.h
/usr/include/shogun/structure/PlifMatrix.h
/usr/include/shogun/structure/PrimalMosekSOSVM.h
/usr/include/shogun/structure/SOSVMHelper.h
/usr/include/shogun/structure/SegmentLoss.h
/usr/include/shogun/structure/SequenceLabels.h
/usr/include/shogun/structure/StateModel.h
/usr/include/shogun/structure/StateModelTypes.h
/usr/include/shogun/structure/StochasticSOSVM.h
/usr/include/shogun/structure/StructuredModel.h
/usr/include/shogun/structure/TwoStateModel.h
/usr/include/shogun/structure/libbmrm.h
/usr/include/shogun/structure/libncbm.h
/usr/include/shogun/structure/libp3bm.h
/usr/include/shogun/structure/libppbm.h