/usr/include/shogun/mathematics/linalg/ratapprox/ is in libshogun-dev 3.2.0-7.3build4.
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..
/usr/include/shogun/mathematics/linalg/ratapprox/logdet/
/usr/include/shogun/mathematics/linalg/ratapprox/logdet/LogDetEstimator.h
/usr/include/shogun/mathematics/linalg/ratapprox/logdet/computation/
/usr/include/shogun/mathematics/linalg/ratapprox/logdet/computation/aggregator/
/usr/include/shogun/mathematics/linalg/ratapprox/logdet/computation/aggregator/IndividualJobResultAggregator.h
/usr/include/shogun/mathematics/linalg/ratapprox/logdet/computation/job/
/usr/include/shogun/mathematics/linalg/ratapprox/logdet/computation/job/DenseExactLogJob.h
/usr/include/shogun/mathematics/linalg/ratapprox/logdet/computation/job/RationalApproximationCGMJob.h
/usr/include/shogun/mathematics/linalg/ratapprox/logdet/computation/job/RationalApproximationIndividualJob.h
/usr/include/shogun/mathematics/linalg/ratapprox/logdet/opfunc/
/usr/include/shogun/mathematics/linalg/ratapprox/logdet/opfunc/DenseMatrixExactLog.h
/usr/include/shogun/mathematics/linalg/ratapprox/logdet/opfunc/LogRationalApproximationCGM.h
/usr/include/shogun/mathematics/linalg/ratapprox/logdet/opfunc/LogRationalApproximationIndividual.h
/usr/include/shogun/mathematics/linalg/ratapprox/opfunc/
/usr/include/shogun/mathematics/linalg/ratapprox/opfunc/OperatorFunction.h
/usr/include/shogun/mathematics/linalg/ratapprox/opfunc/RationalApproximation.h
/usr/include/shogun/mathematics/linalg/ratapprox/tracesampler/
/usr/include/shogun/mathematics/linalg/ratapprox/tracesampler/NormalSampler.h
/usr/include/shogun/mathematics/linalg/ratapprox/tracesampler/ProbingSampler.h
/usr/include/shogun/mathematics/linalg/ratapprox/tracesampler/TraceSampler.h