推荐系统

词频处理 tf/idf.

协同过滤

1.Co-occurence matrix. Normalize co-occurrence Similarity matrix.

1.1 Jaccard similarity: normalizes by popularity 

Who purchased i and j divided by who purchased i or j

矩阵分解(matrix factorized)

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原文地址：https://www.cnblogs.com/Shinered/p/9029872.html