Machine Learning Fundamentals · 免费预览
分布偏移
分类器会继承其拟合数据所隐含的假设；当测试分布以三种特定方式中的任意一种发生偏移时，准确率会下降，而留出集无法检测到这种下降。
1. The setup
The setup
2. Covariate shift
Covariate shift
3. Label shift and concept shift
Label shift and concept shift
4. Which distribution shifted
A spam classifier is trained on email from one country where 10% of messages are spam, and deployed in another country where 60% are spam. The visual characteristics of a spam message are the same in both countries. Which type of shift is this?
5. Covariate shift holds which factor fixed
Under covariate shift, the distribution of inputs may change between training and test, while the labeling function ____ stays fixed.