文章目录案例–算法实现:Item-Based CF 预测评分算法实现 案例–算法实现:Item-Based CF 预测评分 评分预测公式: pred(u,i)=r^ui=∑j∈Iratedsim(i,j)∗ruj∑j∈Iratedsim(i,j) pred(u,i)=\hat{r}_{ui}=\cfrac{\sum_{j\in I_{rated}}sim(i,j)*r_{uj}}{\sum_{j\in I_{rated}}sim(i,j)} pred(u,i)=r^ui​=∑j∈Irated​​sim(i,j)∑j∈Irated​​sim(i,j)∗ruj​​ 算法实现 实现评分预测方法:pr