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Graph-based Regularization on Embedding Layers for Recommendation

Published: 05 September 2020 Publication History

Abstract

Neural networks have been extensively used in recommender systems. Embedding layers are not only necessary but also crucial for neural models in recommendation as a typical discrete task. In this article, we argue that the widely used l2 regularization for normal neural layers (e.g., fully connected layers) is not ideal for embedding layers from the perspective of regularization theory in Reproducing Kernel Hilbert Space. More specifically, the l2 regularization corresponds to the inner product and the distance in the Euclidean space where correlations between discrete objects (e.g., items) are not well captured. Inspired by this observation, we propose a graph-based regularization approach to serve as a counterpart of the l2 regularization for embedding layers. The proposed regularization incurs almost no extra computational overhead especially when being trained with mini-batches. We also discuss its relationships to other approaches (namely, data augmentation, graph convolution, and joint learning) theoretically. We conducted extensive experiments on five publicly available datasets from various domains with two state-of-the-art recommendation models. Results show that given a kNN (k-nearest neighbor) graph constructed directly from training data without external information, the proposed approach significantly outperforms the l2 regularization on all the datasets and achieves more notable improvements for long-tail users and items.

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cover image ACM Transactions on Information Systems
ACM Transactions on Information Systems  Volume 39, Issue 1
January 2021
329 pages
ISSN:1046-8188
EISSN:1558-2868
DOI:10.1145/3423044
Issue’s Table of Contents
Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected]

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Publication History

Published: 05 September 2020
Accepted: 01 July 2020
Revised: 01 June 2020
Received: 01 January 2020
Published in TOIS Volume 39, Issue 1

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Author Tags

  1. Embedding
  2. graph-based regularization
  3. neural recommender system

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  • Research-article
  • Research
  • Refereed

Funding Sources

  • National Key Research and Development Program of China
  • MOE-ChinaMobile Program
  • NSFC

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