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Difference embedding for recommender systems

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Abstract

This paper proposes a novel and straightforward pointwise training strategy, namely difference embedding (DifE), for recommender systems that capture the personalized information retained in pairwise preference differences while simply using effective and efficient pointwise training. Specifically, a function was designed to capture and emphasize pairwise preference differences. Then, a novel projection was used to construct a new space in which pairwise information is preserved, and the newly proposed pointwise loss function is sufficient to learn a better embedding. To verify the superiority and generality of the proposed strategy, we integrate the proposed loss function with four state-of-the-art recommenders and obtain four corresponding optimized models namely MF-DifE, NeuMF-DifE, GCN-DifE, and SGL-DifE. Comprehensive and comparative experiment results on three public datasets show that these optimized models achieve significant improvement compared to their corresponding baselines and outperform various recent recommendation methods, which indicates the excellence and generality of the proposed loss function.

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Notes

  1. https://github.com/hexiangnan/neural_collaborative_filtering

  2. https://github.com/gusye1234/LightGCN-PyTorch

  3. https://github.com/wujcan/SGL

  4. https://github.com/familyld/DeepCF

  5. https://github.com/huangtinglin/NGCF-PyTorch

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Acknowledgements

The first author is funded by the China Scholarship Council (CSC) from the Ministry of Education of P.R. China.

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Authors and Affiliations

  1. School of Computer Science and Engineering, UNSW Sydney, Sydney, Sydney, NSW, 2052, Australia

    Peng Yi, Xiongcai Cai & Ziteng Li

  2. Techcul Research, Sydney, NSW, Australia

    Xiongcai Cai

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  1. Peng Yi
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  2. Xiongcai Cai
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  3. Ziteng Li
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Correspondence to Xiongcai Cai.

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Yi, P., Cai, X. & Li, Z. Difference embedding for recommender systems. Data Min Knowl Disc 37, 948–969 (2023). https://doi.org/10.1007/s10618-022-00899-0

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