scikit-learn/scikit-learn — pull request #3587 by jnothman (2014-08-24 04:02:05+00:00)
Title: [MRG] DOC restructure data transformation user guide

This PR restructures the data transformations narrative documentation, most notably including `Pipeline` and `FeatureUnion`, as per #1383. It also separates discussion of preprocessing into more appropriate sections, and gives an introduction to the chapter as a whole.