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explained_variance_ratio kernel pca

#compute the explained variance (and ratio) by doing:
kpca_transform = kpca.fit_transform(feature_vec)
explained_variance = numpy.var(kpca_transform, axis=0)
explained_variance_ratio = explained_variance / numpy.sum(explained_variance)

#to get the cumulative proportion explained variance (often useful in selecting components and estimating the dimensionality of your space):
numpy.cumsum(explained_variance_ratio)
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