这样做的惟一方法是检索所有Account模型，查看所有订阅，并查看给定用户是否位于列表中。
The only way to do this would be to retrieve all Account models, look at all the subscriptions, and see if the given user is in the list.
事故多发点判别模型采用了当量事故数法，判别参数可由用户灵活设置。
The model of the frequent spots of traffic accident in the research is the equivalent traffic accidents number, the parameter of the model can be set optionally by user.
当用户行为偏离特征模型时，利用基于最小风险的贝叶斯判别法，可以实时有效的判断出用户的身份。
When the deviation from the model is found, the system can determine the identity of the user.
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