In unrelated but oddly coincident operations, I spent the day pair-coding a PCA code (yes, I know, I hate PCA; but it sure works well) with Perez-Giz (making use of the scipy SVD) and then listened to a nice seminar by Dmitry Malyshev (Stanford) on a data-driven factorization of the Fermi and WMAP data into spectral and spatial components.
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