DOC: Simpler cross-validation iterator doc
2-fold => 2-fold cross-validation
approximately the same percentage of samples
Remove spurious print statements in sample snippets to make the doc easier to follow
Lowercase y and more consistent blank line usage
skip perfect checkerboard test
Edit typo
Merge pull request #2418 from rsivapr/typo-docs

Edit typo
Merge pull request #2415 from kemaleren/skip_checkerboard

skip perfect checkerboard test
ENH : add score to PCA from ProbabilisticPCA
API : deprecating ProbabilisticPCA
misc
typo
ENH : make PCA scoring work with n_features is big. Avoid covariance computation in PCA.fit
DOC : remove reference to ProbabilisticPCA in doc
update what's new
FIX : do not store precision_ attribute in score method
ENH : add get_precision method with matrix inversion lemma  to PCA for faster scoring
ENH : add tests for get_precision in PCA + some fixes for corner cases
ENH : add get_precision method with matrix inverse lemma  to FactorAnalysis + use precision in score