arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.04185cs.IR
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基于路径推理的异构网络双向推荐模型

Path-Based Reasoning over Heterogeneous Networks for Recommendation via Bidirectional Modeling

Junwei Zhang, Min Gao, Junliang Yu, Linda Yang, Zongwei Wang, Qingyu Xiong

摘要:

异构信息网络(HIN)是推荐系统中数据的自然和通用表示。结合HIN和推荐系统不仅可以帮助建模用户行为,而且还可以通过将用户/项目与网络中的各种类型的实体对齐来使推荐结果可解释。在过去的几年中,基于路径的推理模型在基于隐马尔可夫链的推荐中表现出了巨大的能力。这些模型的基本思想是探索HIN与预定义的路径方案。这些模型虽然有效,但往往面临以下局限性:(1)现有的基于路径的推理模型在对序列进行建模时,大多只考虑了先行节点对后继节点的影响,而忽略了路径中节点之间的相互作用;(2)通常假设同一路径实例中节点的权值为常数,而不同的节点权重可以带来更多的灵活性,并导致表达建模;(3)用户-项目交互是嘈杂的,但他们往往是不加区别地利用。为了克服上述问题,在本文中,我们提出了一种新的基于路径的推理方法推荐HIN。具体来说,我们使用双向LSTM来实现路径的双向建模,并捕获节点之间的互惠性。然后采用注意力机制来学习节点在不同上下文中的动态影响。最后,对抗正则化项施加在模型的损失函数上,以减轻噪声的影响并增强基于HIN的推荐。在三个公共数据集上进行的大量实验表明,我们的模型优于最先进的基线。案例研究进一步证明了我们的模型在可解释推荐任务上的可行性。

英文摘要:

Heterogeneous Information Network (HIN) is a natural and general representation of data in recommender systems. Combining HIN and recommender systems can not only help model user behaviors but also make the recommendation results explainable by aligning the users/items with various types of entities in the network. Over the past few years, path-based reasoning models have shown great capacity in HIN-based recommendation. The basic idea of these models is to explore HIN with predefined path schemes. Despite their effectiveness, these models are often confronted with the following limitations: (1) Most prior path-based reasoning models only consider the influence of the predecessors on the subsequent nodes when modeling the sequences, and ignore the reciprocity between the nodes in a path; (2) The weights of nodes in the same path instance are usually assumed to be constant, whereas varied weights of nodes can bring more flexibility and lead to expressive modeling; (3) User-item interactions are noisy, but they are often indiscriminately exploited. To overcome the aforementioned issues, in this paper, we propose a novel path-based reasoning approach for recommendation over HIN. Concretely, we use a bidirectional LSTM to enable the two-way modeling of paths and capture the reciprocity between nodes. Then an attention mechanism is employed to learn the dynamical influence of nodes in different contexts. Finally, the adversarial regularization terms are imposed on the loss function of the model to mitigate the effects of noise and enhance HIN-based recommendation. Extensive experiments conducted on three public datasets show that our model outperforms the state-of-the-art baselines. The case study further demonstrates the feasibility of our model on the explainable recommendation task.

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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