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arXiv 2602.18288cs.IR
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一种在隐式协同过滤中的拓扑感知正样本集构建与特征优化方法

A Topology-Aware Positive Sample Set Construction and Feature Optimization Method in Implicit Collaborative Filtering

Beijing Institute of Technology(北京理工大学)

Jiayi Wu, Zhengyu Wu, Xunkai Li, Rong-Hua Li, Guoren Wang

AI总结:

本文提出TPSC-FO方法,通过拓扑感知的正样本集构建与特征优化,提升隐式协同过滤中对用户潜在偏好的学习准确性。

摘要:

在隐式协同过滤中,负采样策略被广泛用于解决数据稀疏性和类别不平衡等问题。然而,这些方法常常引入假负样本,阻碍了模型准确学习用户潜在偏好的能力。为缓解这一问题,现有方法根据模型训练的统计特征或负样本的难度调整负采样分布。然而,这些方法面临两个关键限制:(1)过度依赖模型当前的表示能力;(2)未能利用假负样本作为潜在正样本的潜力来更准确地引导模型学习用户偏好。为了解决上述问题,我们提出了一种拓扑感知的正样本集构建与特征优化方法(TPSC-FO)。首先,我们设计了一种简单的拓扑社区感知的假负样本识别(FNI)方法,并观察到交互网络中的拓扑社区结构可以有效识别假负样本。受此启发,我们开发了一个拓扑感知的正样本集构建模块。该模块采用差分社区检测策略来捕捉隐式反馈中的拓扑社区结构,并结合个性化噪声过滤来可靠地识别假负样本并将其转换为正样本。此外,我们引入了一个邻域引导的特征优化模块,通过在嵌入空间中结合邻域特征来优化正样本特征,有效缓解了正样本中的噪声。在五个真实世界数据集和两个合成数据集上的大量实验验证了TPSC-FO的有效性。

英文摘要:

Negative sampling strategies are widely used in implicit collaborative filtering to address issues like data sparsity and class imbalance. However, these methods often introduce false negatives, hindering the model's ability to accurately learn users' latent preferences. To mitigate this problem, existing methods adjust the negative sampling distribution based on statistical features from model training or the hardness of negative samples. Nevertheless, these methods face two key limitations: (1) over-reliance on the model's current representation capabilities; (2) failure to leverage the potential of false negatives as latent positive samples to guide model learning of user preferences more accurately. To address the above issues, we propose a Topology-aware Positive Sample Set Construction and Feature Optimization method (TPSC-FO). First, we design a simple topological community-aware false negative identification (FNI) method and observe that topological community structures in interaction networks can effectively identify false negatives. Motivated by this, we develop a topology-aware positive sample set construction module. This module employs a differential community detection strategy to capture topological community structures in implicit feedback, coupled with personalized noise filtration to reliably identify false negatives and convert them into positive samples. Additionally, we introduce a neighborhood-guided feature optimization module that refines positive sample features by incorporating neighborhood features in the embedding space, effectively mitigating noise in the positive samples. Extensive experiments on five real-world datasets and two synthetic datasets validate the effectiveness of TPSC-FO.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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