[MRG] add whatsnew for scikit-learn#7248 (unpickle version warning) (s…

…cikit-learn#7400)
rsmith54 · Sep 14, 2016 · 074796e · 074796e
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diff --git a/doc/modules/model_persistence.rst b/doc/modules/model_persistence.rst
@@ -56,6 +56,7 @@ with::
    filesystem. All files are required in the same folder when reloading the
    model with joblib.load.
 
+.. _persistence_limitations:
 
 Security & maintainability limitations
 --------------------------------------

diff --git a/doc/whats_new.rst b/doc/whats_new.rst
@@ -323,6 +323,13 @@ Enhancements
      (`#5540 <https://github.com/scikit-learn/scikit-learn/pull/5540>_`)
      By `Andreas Müller`_.
 
+   - When unpickling a scikit-learn estimator in a different version than the one
+     the estimator was trained with, a ``UserWarning`` is raised, see :ref:`the documentation
+     on model persistence <persistence_limitations>`
+     for more details.
+     (`#7248 <https://github.com/scikit-learn/scikit-learn/pull/7248>_`)
+     By `Andreas Müller`_.
+
 Bug fixes
 .........