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Toward Equivalent Transformation of User Preferences in Cross Domain Recommendation

Published: 09 January 2023 Publication History

Abstract

Cross domain recommendation (CDR) is one popular research topic in recommender systems. This article focuses on a popular scenario for CDR where different domains share the same set of users but no overlapping items. The majority of recent methods have explored the shared-user representation to transfer knowledge across domains. However, the idea of shared-user representation resorts to learning the overlapped features of user preferences and suppresses the domain-specific features. Other works try to capture the domain-specific features by an MLP mapping but require heuristic human knowledge of choosing samples to train the mapping. In this article, we attempt to learn both features of user preferences in a more principled way. We assume that each user’s preferences in one domain can be expressed by the other one, and these preferences can be mutually converted to each other with the so-called equivalent transformation. Based on this assumption, we propose an equivalent transformation learner (ETL), which models the joint distribution of user behaviors across domains. The equivalent transformation in ETL relaxes the idea of shared-user representation and allows the learned preferences in different domains to preserve the domain-specific features as well as the overlapped features. Extensive experiments on three public benchmarks demonstrate the effectiveness of ETL compared with recent state-of-the-art methods. Codes and data are available online: https://github.com/xuChenSJTU/ETL-master.

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  1. Toward Equivalent Transformation of User Preferences in Cross Domain Recommendation

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    cover image ACM Transactions on Information Systems
    ACM Transactions on Information Systems  Volume 41, Issue 1
    January 2023
    759 pages
    ISSN:1046-8188
    EISSN:1558-2868
    DOI:10.1145/3570137
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    Association for Computing Machinery

    New York, NY, United States

    Publication History

    Published: 09 January 2023
    Online AM: 09 March 2022
    Accepted: 27 February 2022
    Revised: 23 November 2021
    Received: 14 September 2020
    Published in TOIS Volume 41, Issue 1

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    Author Tags

    1. Cross domain recommendation
    2. domain-specific features
    3. collaborative filtering
    4. equivalent transformation
    5. knowledge transfer
    6. variational inference

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    • Refereed

    Funding Sources

    • National Key R&D Program of China
    • 111 plan
    • STCSM
    • State Key Laboratory of UHD Video and Audio Production and Presentation
    • Australian Research Council
    • A*STAR Centre for Frontier AI Research (CFAR)

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