Python: added standalone decision tree from sklearn

python/isaac/external/__init__.py

@@ -0,0 +1,12 @@
+"""
+The :mod:`sklearn.tree` module includes decision tree-based models for
+classification and regression.
+"""
+
+from .tree import DecisionTreeClassifier
+from .tree import DecisionTreeRegressor
+from .tree import ExtraTreeClassifier
+from .tree import ExtraTreeRegressor
+
+__all__ = ["DecisionTreeClassifier", "DecisionTreeRegressor",
+           "ExtraTreeClassifier", "ExtraTreeRegressor"]