Then the decision tree and class association rules mining are used on the video attribute database to extract a decision tree classification rule set and a class association rule set respectively.

然后分别使用决策树、分类关联规则等技术对视频属性数据库进行数据挖掘，提取出决策树分类规则集和分类关联规则集；

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The introduction of generalized decision tree(GDT) realized the unification of classification rules and decision tree structure.

文章引入了广义决策树的概念，实现了分类规则集和决策树结构的统一。

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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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