Generally, model can be expressed by classification rule, decision tree and mathematical formula.

通常，模型可以用分类规则、判定树或数学公式表示。

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Decision tree is an important method in induction learning as well as in data mining, which can be used to form classification and predictive model.

决策树是归纳学习和数据挖掘的重要方法，通常用来形成分类器和预测模型。

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Using teacher images and machine learning method, an image direction classification model is built as a decision tree. Test results argued the validity of this method.

实验结果表明，系统所使用的轮廓线向量图像特征也能够较有效地应用于图像方向分类，而机器学习则能够有效地为之建立决策树分类模型。

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