arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2102.00627cs.IR
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论解释与推荐的关系:学习排序策略对提高绩效的作用

On the Relationship between Explanation and Recommendation: Learning to Rank Explanations for Improved Performance

Lei Li, Yongfeng Zhang, Li Chen

摘要:

向用户解释为什么推荐某些项目是至关重要的,因为它可以帮助用户做出更好的决策,提高他们的满意度,并获得他们对推荐系统(RS)的信任。然而,现有的可解释的推荐系统通常将解释作为推荐模型的一个副输出,这存在两个问题:(1)由于产生的解释通常依赖于模型,因此难以对其进行评估;(2)因此,解释如何影响推荐性能的研究较少。在本文中,解释建议制定为一个排名任务,并从数据中学习,类似于项目排名的建议。这使得有可能通过排名度量(例如,NDCG)。此外,本文将传统的项目排序扩展为项目-解释联合排序形式化,以研究有目的地选择解释是否可以达到某些学习目标,例如,提高推荐性能。然而,一个很大的挑战是,稀疏性问题的用户-项目-解释数据将不可避免地比传统的用户-项目交互数据,因为不是每个用户-项目对可以与所有的解释。为了缓解这个问题,本文提出了通过将三元关系视为两组二元关系来执行两组矩阵分解。在三个大数据集上的实验验证了该方法在解释排序和项目推荐方面的有效性。

英文摘要:

Explaining to users why some items are recommended is critical, as it can help users to make better decisions, increase their satisfaction, and gain their trust in recommender systems (RS). However, existing explainable RS usually consider explanation as a side output of the recommendation model, which has two problems: (1) it is difficult to evaluate the produced explanations because they are usually model-dependent, and (2) as a result, how the explanations impact the recommendation performance is less investigated. In this paper, explaining recommendations is formulated as a ranking task, and learned from data, similar to item ranking for recommendation. This makes it possible for standard evaluation of explanations via ranking metrics (e.g., NDCG). Furthermore, this paper extends traditional item ranking to an item-explanation joint-ranking formalization to study if purposely selecting explanations could reach certain learning goals, e.g., improving recommendation performance. A great challenge, however, is that the sparsity issue in the user-item-explanation data would be inevitably severer than that in traditional user-item interaction data, since not every user-item pair can be associated with all explanations. To mitigate this issue, this paper proposes to perform two sets of matrix factorization by considering the ternary relationship as two groups of binary relationships. Experiments on three large datasets verify the solution's effectiveness on both explanation ranking and item recommendation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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