CART决策树 python 代码，思想来自Programming Collective Intelligence。未剪枝。数据来自the census bureau database。-CART decision tree python code, thoughts from Programming Collective Intelligence. Not pruning. The data from the census bureau database.

机器学习课本中的未剪枝决策树代码实现，可以直接运行，自行根据书中（西瓜书）表进行建表，输出结果为层次遍历。(Machine learning textbooks do not prune decision tree code, you can run directly, according to the book (watermelon book) table built table, the output results for the hierarchical traversal.)

简单的决策树，使用增益率，未考虑剪枝，和过拟合现象。包含数据。(this file contains data.)