fix wrong confidence interval
Merge pull request #3156 from IvicaJovic/fixes

DOC Fix wrong confidence interval
FIX: use clip(0) instead of abs()

This removes spurious tiny negatives from the output of eig.
DOC : fix alpha docstring in dict learning
DOC : really fix alpha docstring in dict learning
Revert "DOC : really fix alpha docstring in dict learning"

This reverts commit 645863e0f26fd0ed568972f1373d61e1bb10261a.

@agramfort: sorry: a better read of the code told me that it was
transform_alpha used by the OMP. So alpha is indeed always a float
FIX unused pos_label parameter in metrics.precision_recall_curve
Replacing the non-test .todense() methods with .toarray()
Replacing the test .todense() methods with .toarray()
FIX: ENetCV and LassoCV now accept np.float32 input
Merge pull request #3178 from MechCoder/Iss3174

[MRG+1] ENetCV and LassoCV now accept np.float32 input
TST Refactor test of sklearn/ensemble/tests/test_forest.py
Fixing redundant np.asarray(X.toarray()) in metrics
TST refactor oob score testing
Merge pull request #3182 from arjoly/test-forest

[MRG] Modernizes tests for the forest module
CI: make travis run the doctests
Merge pull request #3189 from ogrisel/travis-doctest

CI: make travis run the doctests
DOC multiclass: OvO needs predict_proba or decision_function

Fixes #3183.
FIX: more Python 3 fixes for doc/gen_rst.py
FIX TfidfVectorizer exports idf_ attribute