/usr/include/shogun/machine/ is in libshogun-dev 3.2.0-7.3build4.
This file is owned by root:root, with mode 0o755.
..
/usr/include/shogun/machine/BaggingMachine.h
/usr/include/shogun/machine/BaseMulticlassMachine.h
/usr/include/shogun/machine/DirectorKernelMachine.h
/usr/include/shogun/machine/DirectorLinearMachine.h
/usr/include/shogun/machine/DistanceMachine.h
/usr/include/shogun/machine/GaussianProcessMachine.h
/usr/include/shogun/machine/KernelMachine.h
/usr/include/shogun/machine/KernelMulticlassMachine.h
/usr/include/shogun/machine/KernelStructuredOutputMachine.h
/usr/include/shogun/machine/LinearLatentMachine.h
/usr/include/shogun/machine/LinearMachine.h
/usr/include/shogun/machine/LinearMulticlassMachine.h
/usr/include/shogun/machine/LinearStructuredOutputMachine.h
/usr/include/shogun/machine/Machine.h
/usr/include/shogun/machine/MulticlassMachine.h
/usr/include/shogun/machine/NativeMulticlassMachine.h
/usr/include/shogun/machine/OnlineLinearMachine.h
/usr/include/shogun/machine/StructuredOutputMachine.h
/usr/include/shogun/machine/gp/
/usr/include/shogun/machine/gp/EPInferenceMethod.h
/usr/include/shogun/machine/gp/ExactInferenceMethod.h
/usr/include/shogun/machine/gp/FITCInferenceMethod.h
/usr/include/shogun/machine/gp/GaussianLikelihood.h
/usr/include/shogun/machine/gp/InferenceMethod.h
/usr/include/shogun/machine/gp/LaplacianInferenceMethod.h
/usr/include/shogun/machine/gp/LikelihoodModel.h
/usr/include/shogun/machine/gp/LogitLikelihood.h
/usr/include/shogun/machine/gp/MeanFunction.h
/usr/include/shogun/machine/gp/ProbitLikelihood.h
/usr/include/shogun/machine/gp/StudentsTLikelihood.h
/usr/include/shogun/machine/gp/ZeroMean.h