Sk8er的专栏

Logistic Regression 不同于 Linear Regression，它可以是预测结果成为离散的值（比如正类、负类）。因此它可以作为 classification 的工具。如果听过Andrew Ng的Machine Learning课程的话，应该知道其实在进行优化求导过程中，Logisitc Regression 和 Linear Regression 的偏导数是一样样的。虽然他们的

It’s not enough for a machine learning algorithm to optimize its cost on your data set. If your algorithm works well with points in your data set, but not on new points, then the algorithm overfit the