（3）上面的 r 还有一种情况就是X-的情况 ，整合到一起 r*y（i）叫做 几何距离（geometric distance），因为到时候我们的样本标签给出的y 的值为第一类 == 1，第二类 == -1 ，y属于｛1，-1｝
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mean geometrical distance 几何平均距离
Euclidean geometrical distance method 欧氏几何距离法
geometrical mean distance 几何平均距离
Analyzing and improving the concept similarity calculating based on geometrical distance, a sentence similarity calculating model based on ontology and How-net is proposed.
对基于几何距离的概念相似度计算进行分析和改进，提出了基于本体和知网的问句间相似度计算模型。
Then, the paper essentializes the two key problems in the course of building a three-dimensional monitor network: the optimum geometrical graph and the precision distance surveying.
同时，简要分析了建立高精度的测边三维监测网的两个关键问题，即最优构形和精密光波测距。
However the fin height, fin Angle and distance of finned tube have the large influence to the finned tube heat, all of them exist the optimal geometrical dimensions.
然而翅片高度、翅片夹角和管排间距则对翅片管的散热性能影响很大，分别存在最优的几何尺寸。
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