ENH: small optimization in PresortBestSplitter
Fix typo in the Gaussian PDF

Hopefully, this same issue doesn't exist in the code.

I would also feel more comfortable if mu_y and sigma_y were mu_iy and sigma_iy, respectively, seeing as there are separate distributions per feature, per class.
Merge pull request #2489 from samuela/patch-1

Fix typo in the Gaussian PDF in Naive Bayes docs
FIX scipy API
... add the fix to import check
Merge pull request #2497 from dengemann/extend_fast_dot

FIX: support older scipy API for fast_dot
AdaBoostRegressor: fix redundant recalculation of error_vect.max()
Merge pull request #2500 from ndawe/r2

[MRG] AdaBoostRegressor: fix redundant recalculation of error_vect.max()
ENH: remove offset calculations
ENH: use memset and memcpy when possible
ENH: make sort an inline nogil function
ENH: make node_reset/split/value gil-free
ENH: use npy_int32 type