arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2511.20122cs.IR
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迈向推荐任务的三视扩散框架

Towards A Tri-View Diffusion Framework for Recommendation

Ximing Chen, Pui Ieng Lei, Yijun Sheng, Yanyan Liu, Zhiguo Gong

AI总结:

本文提出了一种三视扩散框架,通过最大化亥姆霍兹自由能结合能量最大化和熵最小化,提升推荐任务的准确性和效率。

摘要:

扩散模型(DMs)最近在推荐任务中获得了显著关注,主要得益于其在提取、建模和生成全面用户偏好的卓越能力。然而,以往的研究未能从严格的角度审视扩散模型在推荐任务中的应用。本文首先从热力学角度实验性地研究推荐模型的完整性。我们发现,现有的基于扩散模型的推荐模型通过最大化能量来运作,而经典推荐模型则通过减少熵来运作。基于这一发现,我们提出了一种最小化的扩散框架,通过最大化亥姆霍兹自由能同时结合两种因素。同时,为了促进优化,我们的反向过程配备了精心设计的去噪器,以保持固有的各向异性,该指标在双图环境中测量用户-物品交叉相关性。最后,我们采用接受-拒绝高斯采样过程(AR-GSP)来优先考虑远多于观察到的未观察交互,以增强模型的鲁棒性。AR-GSP整合了接受-拒绝采样以确保高质量的硬负样本用于一般推荐任务,并采用时间步依赖的高斯软最大值来处理扩散模型的自适应采样策略。理论分析和广泛的实验表明,我们提出的框架在准确性和效率方面均优于基线模型。

英文摘要:

Diffusion models (DMs) have recently gained significant interest for their exceptional potential in recommendation tasks. This stems primarily from their prominent capability in distilling, modeling, and generating comprehensive user preferences. However, previous work fails to examine DMs in recommendation tasks through a rigorous lens. In this paper, we first experimentally investigate the completeness of recommender models from a thermodynamic view. We reveal that existing DM-based recommender models operate by maximizing the energy, while classic recommender models operate by reducing the entropy. Based on this finding, we propose a minimalistic diffusion framework that incorporates both factors via the maximization of Helmholtz free energy. Meanwhile, to foster the optimization, our reverse process is armed with a well-designed denoiser to maintain the inherent anisotropy, which measures the user-item cross-correlation in the context of bipartite graphs. Finally, we adopt an Acceptance-Rejection Gumbel Sampling Process (AR-GSP) to prioritize the far-outnumbered unobserved interactions for model robustness. AR-GSP integrates an acceptance-rejection sampling to ensure high-quality hard negative samples for general recommendation tasks, and a timestep-dependent Gumbel Softmax to handle an adaptive sampling strategy for diffusion models. Theoretical analyses and extensive experiments demonstrate that our proposed framework has distinct superiority over baselines in terms of accuracy and efficiency.

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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