提出双视角交互网络,同时捕捉用户行为细节与整体兴趣分布。
Bridging Sequential and Contextual Features with a Dual-View of Fine-grained Core-Behaviors and Global Interest-Distribution
- 设计双视角机制:细粒度核心行为交互 + 粗粒度兴趣分布补偿
- 在多个数据集上显著提升点击率预测准确率,优于现有模型
- 适合需要精准用户兴趣建模的推荐系统场景
点击率(CTR)预测通常通过建模用户行为序列特征和候选物品的上下文特征来估计用户点击概率,其中行为序列尤为重要,因其能动态反映用户兴趣变化。传统方法将动态序列聚合为单一向量后再与上下文特征交互,导致行为信息损失,并限制了上下文特征与具体行为之间的交互能力,削弱了对细粒度行为细节的捕捉,影响预测精度。相反,直接逐条行为与上下文交互则计算成本高,且引入大量无关行为噪声,掩盖相关行为信号。为此,本文提出核心行为与分布补偿双视角交互网络(CDNet),从两个互补角度弥合序列与上下文特征间的交互鸿沟:一是聚焦最相关行为与上下文的细粒度交互;二是建模用户整体兴趣分布与上下文的粗粒度交互。该设计在保留关键行为细节的同时兼顾全局兴趣,有效建模序列与上下文特征的协同作用,且计算开销可控。大量实验验证了其有效性。
原文摘要 · Abstract (English)
Click-through rate (CTR) prediction tasks typically estimate the probability of a user clicking on a candidate item by modeling both user behavior sequence features and the item's contextual features, where the user behavior sequence is particularly critical as it dynamically reflects real-time shifts in user interest. Traditional CTR models often aggregate this dynamic sequence into a single vector before interacting it with contextual features. This approach, however, not only leads to behavior information loss during aggregation but also severely limits the model's capacity to capture interactions between contextual features and specific user behaviors, ultimately impairing its ability to capture fine-grained behavioral details and hindering models' prediction accuracy. Conversely, a naive approach of directly interacting with each user action with contextual features is computationally expensive and introduces significant noise from behaviors irrelevant to the candidate item. This noise tends to overwhelm the valuable signals arising from interactions involving more behaviors relevant to the candidate item. Therefore, to resolve the above issue, we propose a Core-Behaviors and Distributional-Compensation Dual-View Interaction Network (CDNet), which bridges the gap between sequential and contextual feature interactions from two complementary angles: a fine-grained interaction involving the most relevant behaviors and contextual features, and a coarse-grained interaction that models the user's overall interest distribution against the contextual features. By simultaneously capturing important behavioral details without forgoing the holistic user interest, CDNet effectively models the interplay between sequential and contextual features without imposing a significant computational burden. Ultimately, extensive experiments validate the effectiveness of CDNet.
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