@@ -440,3 +440,16 @@ class BalancingLearner(BaseLearner):

     def _set_data(self, data):

         for l, _data in zip(self.learners, data):

             l._set_data(_data)

+

+    def __getstate__(self):

+        return (

+            self.learners,

+            self._cdims_default,

+            self.strategy,

+            self._get_data(),

+        )

+

+    def __setstate__(self, state):

+        learners, cdims, strategy, data = state

+        self.__init__(learners, cdims=cdims, strategy=strategy)

+        self._set_data(data)