Interpretable Recommender System With Heterogeneous Information: A Geometric Deep Learning Perspective

47 Pages Posted: 13 Nov 2020

See all articles by Yan Leng

Yan Leng

University of Texas at Austin - Red McCombs School of Business

Rodrigo Ruiz

affiliation not provided to SSRN

Xiaowen Dong

University of Oxford - Oxford-Man Institute of Quantitative Finance

Alex ‘Sandy’ Pentland

Massachusetts Institute of Technology (MIT) - MIT Media Laboratory

Date Written: September 20, 2020

Abstract

Recommender systems (RS) are ubiquitous in digital space. This paper develops a deep learning-based approach to address three practical challenges in RS: complex structures of high-dimensional data, noise in relational information, and the black-box nature of machine learning algorithms. Our method—Multi-GraphGraph Attention Network (MG-GAT)—learns latent user and business representations by aggregating a diverse set of information from neighbors of each user (business) on a neighbor importance graph. MG-GAT out-performs state-of-the-art deep learning models in the recommendation task using two large-scale datasets collected from Yelp and four other standard datasets in RS. The improved performance highlights MG-GAT’s advantage in incorporating multi-modal features in a principled manner. The features importance, neighbor importance graph, and latent representations reveal business insights on predictive features and explainable characteristics of business and users. Moreover, the learned neighbor importance graph can be used in a variety of management applications, such as targeting customers, promoting new businesses, and designing information acquisition strategies. Our paper presents a quintessential big data application of deep learning models in management while providing interpretability essential for real-world decision-making.

Keywords: Recommender systems, Heterogeneous information, Matrix completion, Geometric deep learning, Representation learning, Interpretable machine learning

Suggested Citation

Leng, Yan and Ruiz, Rodrigo and Dong, Xiaowen and Pentland, Alex ‘Sandy’, Interpretable Recommender System With Heterogeneous Information: A Geometric Deep Learning Perspective (September 20, 2020). Available at SSRN: https://ssrn.com/abstract=3696092 or http://dx.doi.org/10.2139/ssrn.3696092

Yan Leng (Contact Author)

University of Texas at Austin - Red McCombs School of Business ( email )

Austin, TX
United States

Rodrigo Ruiz

affiliation not provided to SSRN

Xiaowen Dong

University of Oxford - Oxford-Man Institute of Quantitative Finance ( email )

Eagle House
Walton Well Road
Oxford, Oxfordshire OX2 6ED
United Kingdom

Alex ‘Sandy’ Pentland

Massachusetts Institute of Technology (MIT) - MIT Media Laboratory ( email )

20 Ames St.
Cambridge, MA 02139-4307
United States

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