运用递归与分治策略同时找到一组数据的最大最小数,算法复杂度为n*logn-The use of recursive divide and conquer strategy with the same time find a set of minimum and maximum number of data, the algorithm complexity is n* logn

divide your data set into training and validation sets for n-fold cross-validation.

分类决策树的核心思想就是在一个数据集中找到一个最优特征，然后从这个特征的选值中找一个最优候选值，根据这个最优候选值将数据集分为两个子数据集，然后递归上述操作，直到满足指定条件为止。附代码(The core idea of a classified decision tree is to find an optimal feature in a data set, and then find an optimal candidate value from the selected value of