http://blog.csdn.net/scruelt/article/details/78997697https://github.com/fengdu78/Coursera-ML-AndrewNg-Notes/blob/master/code/ex1-linear%20regression/ML-Exercise1.ipynbhttps://github.com/HuangCongQing/MachineLearning_Nghttps://github.com/yoyoyohamapi/mit-ml
