摘要：
Programming Exercise 5: Regularized Linear Regression and Bias v.s. Variance linearRegCostFunction 与Ex4类似，没什么好说的 learningCurve 绘制出不同训练样本数目下，训练集误差和验证集误 阅读全文
摘要：
Programming Exercise 3: Multi class Classification and Neural Networks 带正则化的多分类Logistic回归 lrCostFunction K(K 2)分类Logistic回归中，可以构造K个分类器，第K个分类器的假设函数$h_\t 阅读全文