摘要：
Chapter7 Regularization The problem of overfitting If we have too many features, the learned hypothesis may fit the training set very well, but fail t 阅读全文
摘要：
Chapter6 Logistic Regression Hypothesis representation We want \(0\le h_\theta(x)\le 1\), so defined sigmoid function(logistic function). \[ g(z)=\fra 阅读全文