参考Bryan大神的XGBoost课程~
1. 自定义目标函数
https://github.com/dmlc/xgboost/blob/master/demo/guide-python/custom_objective.py
2. 机器学习算法中GDBT和XGBOOST的区别有哪些
https://www.zhihu.com/question/41354392
3. DART
http://xgboost.readthedocs.io/en/latest/tutorials/dart.html
4. XGBoost：Reliable Large-scale Tree Boosting System（论文）
5. XGBoost: A scalable TreeBoosting System（论文）
6. XGBoost参数介绍
http://xgboost.readthedocs.io/en/latest/parameter.html
http://blog.csdn.net/chuanda112233/article/details/51913254(中文版)
7. XGBoost原理
http://blog.csdn.net/a819825294/article/details/51206410
8. XGBoost推导
http://xgboost.readthedocs.io/en/latest/model.html
9. GDBT生成新特征
http://blog.csdn.net/bryan__/article/details/51769118
10. TGBOOST python实现
https://github.com/wepe/tgboost
11. XGBoost导读和实战
12. intrduction to Boosted Tree
