• 1. distance difference function ddf: 距离差函数
• 2. isopleth of distance difference function: 距离差函数等值线

• 1.The research emphasizes on the feature selection in internal-nodes, and designs a new Distance Difference Function.
  论文重点研究了决策树内部结点的特征选择方法，设计了一个新的距离差函数。
  dict.yoduao.com
• 2.Common kernel function RBF only has a local characteristic, with the measurement of the difference in brightness according to the Euclidean distance between pixels of two types.
  常用的核函数rbf只具有局部性，根据像素间欧氏距离作为两个类别的亮度差异性测量。
  dict.yoduao.com

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