:param V:是定义在节点上的特征函数，称为状态特征 :param VW:是V对应的权值 :param E:是定义在边上的特征函数，称为转移特征 :param EW:是E对应的权值
(self, V, VW, E, EW)
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nothing calls this directly
no outgoing calls
no test coverage detected