中文说明：数据十大算法十一——CART算发的实现，通过对一个数据源进行分析计算出基尼系数，并得到最小基尼系数，通过基尼系数来构造决策树。
English Description：
The implementation of cart algorithm, which is one of the top ten data algorithms, calculates the Gini coefficient by analyzing a data source, and obtains the minimum Gini coefficient, through which the decision tree is constructed.