Documentation for UnsupervisedSpatialFilter

I have found snippets using the UnsupervisedSpatialFilter, and I think I can guess what it does. However, there seems to be close to zero documentation on this class. Where can I find more information about this MNE functionality?

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tagging @kingjr and @agramfort: question here about UnsupervisedSpatialFilter.

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The entry point is here mne.decoding.UnsupervisedSpatialFilter — MNE 1.2.2 documentation

It is to wrap PCA or ICA as transformers in a pipeline.

Alex

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I believe adding just a few sentences to the documentation explaining that would already be very helpful!