Publication Type
Conference Proceeding Article
Version
acceptedVersion
Publication Date
9-2023
Abstract
We propose a robust recommender systems model which performs matrix completion and a ratings-wise uncertainty estimation jointly. Whilst the prediction module is purely based on an implicit low-rank assumption imposed via nuclear norm regularization, our loss function is augmented by an uncertainty estimation module which learns an anomaly score for each individual rating via a Graph Neural Network: data points deemed more anomalous by the GNN are downregulated in the loss function used to train the low-rank module. The whole model is trained in an end-to-end fashion, allowing the anomaly detection module to tap on the supervised information available in the form of ratings. Thus, our model's predictors enjoy the favourable generalization properties that come with being chosen from small function space (i.e., low-rank matrices), whilst exhibiting the robustness to outliers and flexibility that comes with deep learning methods. Furthermore, the anomaly scores themselves contain valuable qualitative information. Experiments on various real-life datasets demonstrate that our model outperforms standard matrix completion and other baselines, confirming the usefulness of the anomaly detection module.
Keywords
anomaly detection, graph neural network, matrix completion, uncertainty
Discipline
Artificial Intelligence and Robotics | Numerical Analysis and Scientific Computing | Theory and Algorithms
Research Areas
Intelligent Systems and Optimization
Publication
RecSys '23: Proceedings of the 17th ACM Conference on Recommender Systems, Singapore, September 18-22
First Page
1169
Last Page
1174
ISBN
9798400702419
Identifier
10.1145/3604915.3610654
Publisher
ACM
City or Country
New York
Citation
KASALICKY, Petr; LEDENT, Antoine; and ALVES, Rodrigo.
Uncertainty-adjusted inductive matrix completion with Graph Neural Networks. (2023). RecSys '23: Proceedings of the 17th ACM Conference on Recommender Systems, Singapore, September 18-22. 1169-1174.
Available at: https://ink.library.smu.edu.sg/sis_research/8258
Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-No Derivative Works 4.0 International License.
Additional URL
https://doi.org/10.1145/3604915.3610654
Included in
Artificial Intelligence and Robotics Commons, Numerical Analysis and Scientific Computing Commons, Theory and Algorithms Commons