LD4MRec: Simplifying and Powering Diffusion Model for Multimedia Recommendation

TL;DR

This paper introduces LD4MRec, a diffusion-based multimedia recommendation model that simplifies diffusion processes for efficiency and uses a novel conditional network to generate behavior predictions aligned with user preferences.

Contribution

The paper presents a simplified, efficient diffusion model for multimedia recommendation and a new conditional neural network to guide behavior generation based on user preferences.

Findings

LD4MRec outperforms existing methods on three real-world datasets.

The forward-free inference strategy reduces computational complexity.

Guided behavior generation improves recommendation accuracy.

Abstract

Multimedia recommendation aims to predict users' future behaviors based on observed behaviors and item content information. However, the inherent noise contained in observed behaviors easily leads to suboptimal recommendation performance. Recently, the diffusion model's ability to generate information from noise presents a promising solution to this issue, prompting us to explore its application in multimedia recommendation. Nonetheless, several challenges must be addressed: 1) The diffusion model requires simplification to meet the efficiency requirements of real-time recommender systems, 2) The generated behaviors must align with user preference. To address these challenges, we propose a Light Diffusion model for Multimedia Recommendation (LD4MRec). LD4MRec largely reduces computational complexity by employing a forward-free inference strategy, which directly predicts future behaviors from observed noisy behaviors. Meanwhile, to ensure the alignment between generated behaviors and user preference, we propose a novel Conditional neural Network (C-Net). C-Net achieves guided generation by leveraging two key signals, collaborative signals and personalized modality preference signals, thereby improving the semantic consistency between generated behaviors and user preference. Experiments conducted on three real-world datasets demonstrate the effectiveness of LD4MRec.