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どうやら、普通のPCAは使えないっぽい。MFとかTruncartedSVD とか使えばいいのか。 >>> from sklearn.decomposition import TruncatedSVD >>> from scipy import sparse as sp >>> X = sp.rand(1000, 1000, density=0.0001) >>> clf = TruncatedSVD(100) >>>…