Add sample_weight support to Dummy Regressor
Use np.average instead of np.mean
ENH Add cross_val_predict function

This function returns the cross-validated prediction for each element in
the input data (i.e., the prediction that is made when that object is in
the test set).
FIX score precision in doctest
Implements Multiclass Hinge loss
Merge pull request #3779 from arjoly/sw-dummy-regressor

[MRG+1] Add sample_weight support to Dummy Regressor
Update what's new