7M推荐系统 - S1 推荐系统和常用算法
www.jianshu.com/p/3459513e3735
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Item CF/User CF 改进版I2I motivation:热门用户，哈利波特效应，用户行为缺乏考虑 solution:热门用户降权，热门Item降权 实时I2I motivation:新品推荐问题 solution:实时增量i2i Hybrid motivation:无监督学习，无法刻画场景差异 solution:有监督Hybrid多少i2i算法
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