def __init__(self, message=None):
        if message is not None:
            self.message = message
Learn user and item factors from training dataset.
dataset/ETHPy150Open flowroute/txjason/txjason/service.py/JSONRPCError.__init__--crossover with--dataset/ETHPy150Open Mendeley/mrec/mrec/mf/recommender.py/MatrixFactorizationRecommender.fit