scikit-learn/scikit-learn — pull request #1706 by larsmans (2013-02-22 16:15:05+00:00)
Title: WIP: scipy.sparse coef_ on linear models

This PR adds `sparsify` and `densify` methods on linear models that support L1 regularization.

Before merge, we should:
* agree on the names of these methods (`sparsify_coef` is more explicit and maybe less ambiguous, but also longer)
* do the same trick on other estimators, as appropriate (can someone tell me which ones?)

Subsumes #1702.