Title: Dual-Stage Frequency-based Denoising for Generative Recommendation
Primary area: generative models
Keywords: Generative Recommendation, Frequency-Domain Modeling, Denoising, Attention Mechanism

Abstract: Generative recommendation has emerged as a promising frontier in modeling the complex and continuously evolving nature of user preferences. However, its practical effectiveness is often undermined by a fundamental yet overlooked vulnerability: its sensitivity to the pervasive high-frequency sequential noise inherent in raw user interaction data from accidental clicks or transient interests. This paper introduces a paradigm shift that explicitly performs frequency-domain modeling to effectively isolate and suppress sequential noise, while further addressing the challenge of frequency-domain sparsity. Specifically, we propose TONE (Two-stage Optimized deNoising for gEnerative recommendation), a generative framework built around a principled two-stage denoising strategy. In the first stage of item codebook construction, we apply ResGMM (Residual Gaussian Mixture Model) to better fit clustering boundaries, thereby alleviating semantic noise and establishing a robust foundation. In the second stage, on the generative model side, we employ a learnable Gaussian kernel to filter context-specific noise. Furthermore, we redesign the residual frequency-domain attention mechanism with explicit separation of real and imaginary components, and introduce a learnable matrix to counteract attention collapse induced by Fourier energy concentration, while preserving expressiveness. Empirical results demonstrate that TONE achieves the new state-of-the-art performance over strong baselines on three widely used benchmarks, achieving notable improvements on the Amazon Beauty dataset, with gains of 8.93\% in Recall@20 and 8.33\% in NDCG@20. Extensive experiments confirm that explicit frequency-domain denoising is key to unlocking a new level of performance and robustness in generative recommendation. The source code is available at \url{https://anonymous.4open.science/r/TONE-9E07/}.