arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.09316cs.LGstat.ML
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通过解析学习表示的可解释推荐系统

Explainable Recommender Systems via Resolving Learning Representations

Texas A&M University(德克萨斯A&M大学);University of Arizona(亚利桑那大学);Samsung Research America(三星美国研究院);Samsung Electronics(三星电子)

Ninghao Liu, Yong Ge, Li Li, Xia Hu, Rui Chen, Soo-Hyun Choi

摘要:

推荐系统在Web应用中起着过滤海量信息和匹配用户兴趣的基础作用。虽然许多努力已经致力于开发更有效的模型,在各种情况下,对推荐系统的可解释性的探索是落后的。解释可以帮助改善用户体验和发现系统缺陷。本文在形式化地介绍了与模型可解释性相关的元素后,通过提高表示学习过程的透明性,提出了一种新的可解释推荐模型。具体来说,为了克服传统模型中的表示纠缠问题,我们修改了传统的图卷积来区分来自不同层的信息。此外,每个表示向量被分解为几个片段,其中每个片段与数据中的一个语义方面相关。与以往的工作不同,在我们的模型中,因子发现和表示学习同时进行,我们能够处理额外的属性信息和知识。通过这种方式,所提出的模型可以学习用户和项目的可解释和有意义的表示。与传统方法需要在可解释性和有效性之间进行权衡不同,我们提出的可解释模型的性能在考虑可解释性后不会受到负面影响。最后,综合实验验证了我们的模型的性能以及解释的忠实性。

英文摘要:

Recommender systems play a fundamental role in web applications in filtering massive information and matching user interests. While many efforts have been devoted to developing more effective models in various scenarios, the exploration on the explainability of recommender systems is running behind. Explanations could help improve user experience and discover system defects. In this paper, after formally introducing the elements that are related to model explainability, we propose a novel explainable recommendation model through improving the transparency of the representation learning process. Specifically, to overcome the representation entangling problem in traditional models, we revise traditional graph convolution to discriminate information from different layers. Also, each representation vector is factorized into several segments, where each segment relates to one semantic aspect in data. Different from previous work, in our model, factor discovery and representation learning are simultaneously conducted, and we are able to handle extra attribute information and knowledge. In this way, the proposed model can learn interpretable and meaningful representations for users and items. Unlike traditional methods that need to make a trade-off between explainability and effectiveness, the performance of our proposed explainable model is not negatively affected after considering explainability. Finally, comprehensive experiments are conducted to validate the performance of our model as well as explanation faithfulness.

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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