Multimodal recommendation aims to model user and item representations
comprehensively with the involvement of multimedia content for effective
recommendations. Existing research has shown that it is beneficial for
recommendation performance to combine (user- and item-) ID embeddings with
multimodal salient features, indicating the value of IDs. However, there is a
lack of a thorough analysis of the ID embeddings in terms of feature semantics
in the literature. In this paper, we revisit the value of ID embeddings for
multimodal recommendation and conduct a thorough study regarding its semantics,
which we recognize as subtle features of content and structures. Then, we
propose a novel recommendation model by incorporating ID embeddings to enhance
the semantic features of both content and structures. Specifically, we put
forward a hierarchical attention mechanism to incorporate ID embeddings in
modality fusing, coupled with contrastive learning, to enhance content
representations. Meanwhile, we propose a lightweight graph convolutional
network for each modality to amalgamate neighborhood and ID embeddings for
improving structural representations. Finally, the content and structure
representations are combined to form the ultimate item embedding for
recommendation. Extensive experiments on three real-world datasets (Baby,
Sports, and Clothing) demonstrate the superiority of our method over
state-of-the-art multimodal recommendation methods and the effectiveness of
fine-grained ID embeddings.

本文研究了多模态推荐中 ID 嵌入的价值和语义特征，并提出了一种新的推荐模型，通过引入 ID 嵌入来增强内容和结构的语义特征。通过层次化注意机制和对比学习，提高了内容表示，并利用轻量级图卷积网络和 ID 嵌入改进了结构表示，最后将内容和结构表示相结合形成最终的物品嵌入。实验结果证明了我们方法在多个真实数据集上的优越性和对精细 ID 嵌入的有效性。