this is for isolation forest algorithm: http://cs.nju.edu.cn/zhouzh/zhouzh.files/publication/icdm08b.pdf
http://cs.nju.edu.cn/zhouzh/zhouzh.files/publication/tkdd11.pdf
csdn:http://blog.csdn.net/liyuan123zhouhui/article/details/51605643 the code is head only,and easy use
this code was complete two years ago,which was not test under practice use,thanks arror fixed some bugs in the code and it has almost the same calculate result as the scikit-learn's result.
scikit-learn's isolation forest: http://scikit-learn.org/stable/modules/generated/sklearn.ensemble.IsolationForest.html#sklearn.ensemble.IsolationForest