吴恩达机器学习错题集

Week 3 Regularization

第 1 题
You are training a classification model with logistic regression. Which of the following statements are true? Check 
all that apply.

A.Introducing regularization to the model always results in equal or better performance on the training set.
B.Adding many new features to the model helps prevent overfitting ont the training set.
C.Introducing regularization to the model always results in equal or better performance on examples not in the training set.
D.Adding a new feature to the model always results in equal or better performance on the training set. 

A.错，lamda过大时会导致结果欠拟合

B.错，增加过多特征会使模型过拟合

C.错，一般来讲C是对的，但是这个always就比较骚了

D.对，但是如果改成在测试集上表现更好D就错了