用文本增强提示学习,解决跨域推荐中无重叠物品的知识迁移难题。
Semantic-enhanced Co-attention Prompt Learning for Non-overlapping Cross-Domain Recommendation
- 用物品文本代替ID,捕捉语义信息以促进跨域知识迁移。
- 设计共享与专属提示,通过共注意力网络直接学习可迁移特征。
- 适用于多源域到单目标域的推荐场景,尤其适合无重叠物品的数据集。
非重叠跨域序列推荐(NCSR)关注在无重叠实体情况下进行领域知识迁移。相较于传统跨域序列推荐(CSR),NCSR面临三大挑战:1)现有方法依赖显式物品ID,忽视实体间的语义信息;2)主流CSR依赖领域对齐进行知识迁移,易造成语义损失;3)多数研究未考虑多对一特性,而该特性因使用多个源域而更具挑战性。针对上述问题,我们引入提示学习技术,提出面向多对一非重叠跨域推荐(MNCSR)的文本增强共注意力提示学习范式(TCPLP)。具体而言,通过文本表示物品以捕捉语义信息,利用自然语言普遍性促进跨域知识迁移。不同于需领域对齐的方法,我们直接学习可迁移的领域信息,设计共享与专属两类提示,并采用基于共注意力的网络进行提示编码。进一步提出两阶段学习策略——预训练与提示微调,分别实现领域知识预学习与迁移。我们在三个数据集上进行了广泛实验,结果表明TCPLP具有显著优势。代码已公开。
原文摘要 · Abstract (English)
Non-overlapping Cross-domain Sequential Recommendation (NCSR) is the task that focuses on domain knowledge transfer without overlapping entities. Compared with traditional Cross-domain Sequential Recommendation (CSR), NCSR poses several challenges: 1) NCSR methods often rely on explicit item IDs, overlooking semantic information among entities. 2) Existing CSR mainly relies on domain alignment for knowledge transfer, risking semantic loss during alignment. 3) Most previous studies do not consider the many-to-one characteristic, which is challenging because of the utilization of multiple source domains. Given the above challenges, we introduce the prompt learning technique for Many-to-one Non-overlapping Cross-domain Sequential Recommendation (MNCSR) and propose a Text-enhanced Co-attention Prompt Learning Paradigm (TCPLP). Specifically, we capture semantic meanings by representing items through text rather than IDs, leveraging natural language universality to facilitate cross-domain knowledge transfer. Unlike prior works that need to conduct domain alignment, we directly learn transferable domain information, where two types of prompts, i.e., domain-shared and domain-specific prompts, are devised, with a co-attention-based network for prompt encoding. Then, we develop a two-stage learning strategy, i.e., pre-train & prompt-tuning paradigm, for domain knowledge pre-learning and transferring, respectively. We conduct extensive experiments on three datasets and the experimental results demonstrate the superiority of our TCPLP. Our source codes have been publicly released.
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