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• W3208747044 abstract "Collaborative filtering (CF) is a long-standing problem of recommender systems. Many novel methods have been proposed, ranging from classical matrix factorization to recent graph convolutional network-based approaches. After recent fierce debates, researchers started to focus on linear graph convolutional networks (GCNs) with a layer combination, which show state-of-the-art accuracy in many datasets. In this work, we extend them based on neural ordinary differential equations (NODEs), because the linear GCN concept can be interpreted as a differential equation, and present the method of Learnable-Time ODE-based Collaborative Filtering (LT-OCF). The main novelty in our method is that after redesigning linear GCNs on top of the NODE regime, i) we learn the optimal architecture rather than relying on manually designed ones, ii) we learn smooth ODE solutions that are considered suitable for CF, and iii) we test with various ODE solvers that internally build a diverse set of neural network connections. We also present a novel training method specialized to our method. In our experiments with three benchmark datasets, our method consistently outperforms existing methods in terms of various evaluation metrics. One more important discovery is that our best accuracy was achieved by dense connections." @default.
• W3208747044 created "2021-11-08" @default.
• W3208747044 creator A5059294187 @default.
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• W3208747044 date "2021-10-26" @default.
• W3208747044 modified "2023-09-24" @default.
• W3208747044 title "LT-OCF" @default.
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• W3208747044 doi "https://doi.org/10.1145/3459637.3482449" @default.
• W3208747044 hasPublicationYear "2021" @default.
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