通过融合时间间隔与注意力权重,提升会话推荐准确性。
DTAMLP: Denoise Time-aware MLP for Session-based Recommendation

- 引入轻量级权重融合模块,区分有效与偶然点击时间。
- 在Diginetica和RetailRocket数据集上显著提升推荐精度。
- 适合关注时间建模与可解释性推荐系统的研究者。
本文针对会话推荐(SBR)提出统一模型DTAMLP,发现现有时间感知与图神经网络模型对所有点击时间间隔一视同仁,而极短停留时间常反映无意识点击,携带极少偏好信号——此现象称为随机噪声。我们设计了一个轻量、即插即用的权重融合模块,将注意力权重与阈值截断的时间间隔权重结合,插入现有模型几乎无需改动,即可持续提升准确率;这是本工作的最直接验证贡献。其次,我们重新审视FMLP-Rec中一个未被充分解释的现象:对物品嵌入施加可学习频域滤波器能提升性能,提出可能解释:时域行为混杂多种纠缠的心理偏好,而频域视角或能更自然地分离并抑制此类偏好噪声——此为解释性假设而非确证机制。基于上述洞察,构建了结合权重融合与FFT滤波的全MLP框架DTAMLP,分别在Diginetica和RetailRocket数据集上验证。尽管该系统设计反映2023年领域现状而非顶尖水平,消融实验确认两种机制贡献互补且非冗余。
原文摘要 · Abstract (English)
This paper reports two empirical findings on session-based recommendation (SBR), unified in a single model, DTAMLP. First, existing time-aware and GNN-based models (e.g., TiSASRec, SR-GNN) treat every click-time interval as equally informative, even though very short dwell times often reflect accidental clicks carrying little preference signal -- a phenomenon we call sporadic noise. We show that a lightweight, plug-and-play weight fusion module, blending a model's attention weight with a threshold-capped time-interval weight, can be inserted into such models with almost no architectural change and yields a consistent accuracy gain; we view this as the most directly verifiable contribution of this work. Second, we revisit an under-explained observation from FMLP-Rec, where a learnable frequency-domain filter on item embeddings improves accuracy, and offer a possible explanation: time-domain behavior mixes several entangled psychological preferences, and a frequency-domain view may let a model separate and down-weight such preference noise more naturally -- an interpretive conjecture rather than a proven mechanism. Building on both insights, DTAMLP, an all-MLP framework combining weight fusion and FFT-based filtering, is validated on Diginetica and RetailRocket. While this system-level design reflects the state of the field circa 2023 rather than a state-of-the-art claim, ablations confirm the two mechanisms contribute complementary, non-redundant improvements.
Thank you to arXiv for use of its open access interoperability. PaperDance 不是 arXiv 官方产品;中文卡片由大模型生成,请以原文为准。