Take a look at flucoma

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https://github.com/flucoma/flucoma-sc allows for PCA/NMF on Buffers in SC.

As Flucoma itself is a C++ library the algorithms are implemented as a UGen in SC which gets quite quirky sometimes - but impressive and worth taking a look for sure.
I think the Python introduction is still vaild as it allows for a more experimental aproach and one understands the inner workings of the algorithms better.

Is there a possibility to Exchange Buffer information from scsynth <-> sclang like in WaveTables?
Flucoma implements the Eigen library which allows for performant PCA/NMF - I am have not yet checked the solver in MathLib.

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IMO flucoma is not really nice to use.
it should be mentioned somewhere but I think I will not want to use it further in this course.