用户的隐式偏好可以通过分析其对物品的评论数据或者行为数据（例如对物品的在线浏览次数和时间）等方法获得。
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因为关联规则描述的是事件之间的条件概率，因此可以用于推断因果关系。
A. 对
B. 错
关联规则X->Y的置信度等价于条件概率P(Y|X)的值。
A. 对
B. 错
Which of the followingis NOT a proper way to address a man named David Coughlin? ( )
A. David
B. Mr. David
C. Mr. Coughlin
D. Mr. David Coughlin
You see your teacher Sara Goves on campus,whichof the following is the best way to greet her? ( )
A. Hello, Sara! How is your day?
B. Hello, Sara! Have you eaten?
C. Hello, Goves, what’s up?
D. Hello, Goves, where are you going?
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