DOC allow link embedding to proceed when web sites unavailable
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
FIX #3503: use linalg.pinv to better deal with singular input data
Fix using ground truth in silhouette score in document clustering. Closes #3806.
DOC explain SelectorMixin strategy with multiple classes.
Sample weight support for hinge loss
COSMIT: Use searchsorted in weighted_percentile
DOC Add note about sample weights in export_graphviz.
Merge pull request #3829 from amueller/feature_selection_from_model_doc

DOC explain SelectorMixin strategy with multiple classes.
unused variables are redefined later
FeatureUnion example using a heterogeneous datasource.

Uses the 20newsgroups dataset. Extracts & processes the subject-line and body
with separate pipelines and combines them with a FeatureUnion.
DOC RidgeCV more explicit documentation of CV parameter, taken from GridSearchCV.
Merge pull request #3571 from jnothman/fix-link-embedding

[MRG] DOC allow link embedding when some sites not available
MAINT CI: collect rackspace DNS info

Sometimes the following installation step fails:

    pip install -r continuous_integration/appveyor/requirements.txt

This steps download prebuilt version of numpy and scipy for windows that
are hosted on a rackspace container. In order to be able to report
the necessary debugging info to the rackspace cloud support team we need
to know the location of the failing hosts.