def _addRoom(self, room):
        roomJID = room.occupantJID.userhostJID()
        self._rooms[roomJID] = room
Helper function for _fit_coordinate_descent
dataset/ETHPy150Open ralphm/wokkel/wokkel/muc.py/MUCClient._addRoom--crossover with--dataset/ETHPy150Open scikit-learn/scikit-learn/sklearn/decomposition/nmf.py/_update_coordinate_descent