树中的叶节点对应划分的不同区域，每个划分由相关的内部节点的分支规则（Splitting Rules）确定。通过从树根到叶节点移动，每个预测样本被赋予惟一的一个叶节点，同时确定了Y在该节点的条件分布。
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Not to fear, Post says: You won't be breaking any etiquette rules by splitting the cost of a high-dollar gift with a fellow guest.
CNN: Here comes the bride, there goes your wallet?
Mr Hague does not want to provoke his Europhiles into splitting, and so rules out the single currency only for the duration of the next parliament.
ECONOMIST: Up for Portillo
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