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• W4386729575 abstract "Contrastive learning (CL) benefits the training of sequential recommendation models with informative self-supervision signals. Existing solutions apply general sequential data augmentation strategies to generate positive pairs and encourage their representations to be invariant. However, due to the inherent properties of user behavior sequences, some augmentation strategies, such as item substitution, can lead to changes in user intent. Learning indiscriminately invariant representations for all augmentation strategies might be sub-optimal. Therefore, we propose Equivariant Contrastive Learning for Sequential Recommendation (ECL-SR), which endows SR models with great discriminative power, making the learned user behavior representations sensitive to invasive augmentations (e.g., item substitution) and insensitive to mild augmentations (e.g., feature-level dropout masking). In detail, we use the conditional discriminator to capture differences in behavior due to item substitution, which encourages the user behavior encoder to be equivariant to invasive augmentations. Comprehensive experiments on four benchmark datasets show that the proposed ECL-SR framework achieves competitive performance compared to state-of-the-art SR models. The source code is available at https://github.com/Tokkiu/ECL." @default.
• W4386729575 created "2023-09-15" @default.
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• W4386729575 date "2023-09-14" @default.
• W4386729575 modified "2023-09-27" @default.
• W4386729575 title "Equivariant Contrastive Learning for Sequential Recommendation" @default.
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• W4386729575 doi "https://doi.org/10.1145/3604915.3608786" @default.
• W4386729575 hasPublicationYear "2023" @default.
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