The math models of the tree structure chart and the net structure chart are formed by describing the different road state abstractly.
将各种路况进行抽象化描述，形成了描述高速公路物理结构的树状结构图和网状结构图模型。
Decision tree, as a flow chart, is structure of a tree, which is mostly used in finding classification rules and prediction of classification.
决策树是一个类似于流程图的树结构，主要用途是提取分类规则，进行分类预测。
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