基于并行协同过滤算法的领域知识推荐模型研究*

杨恒,王思丽,祝忠明,刘巍,王楠

Recommending Domain Knowledge Based on Parallel Collaborative Filtering Algorithm

Yang Heng,Wang Sili,Zhu Zhongming,Liu Wei,Wang Nan

表2 MapReduce化倒排式协同过滤计算过程

Table 2 Calculation Process of MapReduce Inversion Collaborative Filtering

第一次MR阶段 第二次MR阶段 第三次MR阶段 Map输入 Map输入 Map输入 {userid,itemid,score} {userid,itemid,score} {itemid,itemid,score} Map输出 Map输出 Map输出 {itemid,userid,score} {userid,itemid,score} {itemid,itemid,score} Reduce输入 Reduce输入 Reduce输入 {itemid,userid,score} {userid,itemid,score} {itemid,itemid,score} Reduce输出 Reduce输出 Reduce输出 {userid,itemid,score} {itemid,itemid,score} {itemid,itemid,score}