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关注这篇论文的作者
Ben Dai
Xiaotong Shen
Wei Pan

具有双层单调性的多阶段推荐系统

研究问题
在用户行为存在浏览、点赞、关注等单调事件链且大量观测缺失时,如何利用用户、物品与阶段交互提高个性化预测?
方法与思路
作者结合双层单调性、非负加性潜在因子与大间隔分类,构造正则化目标并连接协变量,采用分块坐标下降求解。
材料陈述的贡献
摘要称,方法减少参数并具有预测一致性,理论比较支持双层单调性改善学习准确度,模拟及文章分享数据展示了比较优势。
阅读关注点
应核对双层单调性的定义、缺失观测机制、预测一致性条件,以及与逐阶段方法和单层单调方法比较时的理论及实验设定。
阅读边界
这是 arXiv 预印本,不能据此认定已同行评审或期刊接收。摘要未给出理论条件与数值,行为单调性在其他场景是否成立未知。

原文摘要

A recommender system learns to predict the user-specific preference or intention over many items simultaneously for all users, making personalized recommendations based on a relatively small number of observations. One central issue is how to leverage three-way interactions, referred to as user-item-stage dependencies on a monotonic chain of events, to enhance the prediction accuracy. A monotonic chain of events occurs, for instance, in an article sharing dataset, where a ``follow'' action implies a ``like'' action, which in turn implies a ``view'' action. In this article, we develop a multistage recommender system utilizing a two-level monotonic property characterizing a monotonic chain of events for personalized prediction. Particularly, we derive a large-margin classifier based on a nonnegative additive latent factor model in the presence of a high percentage of missing observations, particularly between stages, reducing the number of model parameters for personalized prediction while guaranteeing prediction consistency. On this ground, we derive a regularized cost function to learn user-specific behaviors at different stages, linking decision functions to numerical and categorical covariates to model user-item-stage interactions. Computationally, we derive an algorithm based on blockwise coordinate descent. Theoretically, we show that the two-level monotonic property enhances the accuracy of learning as compared to a standard method treating each stage individually and an ordinal method utilizing only one-level monotonicity. Finally, the proposed method compares favorably with existing methods in simulations and an article sharing dataset.

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