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Next-item Recommendation with Sequential Hypergraphs
SIGIR '20: The 43rd International ACM SIGIR conference on research and development in Information Re..., pp.1101-1110, (2020)
- In online platforms with millions of available items and churn in new items, recommendation systems act as an essential component to connect users with interesting items.
- The authors can infer that the bouquet purchased by User was for a wedding since she purchased items typically associated with weddings
- To capture these changes in item semantics, the authors propose to model such short-term item correlations in a hypergraph [1, 11], in which each hyperedge can connect multiple nodes on a single edge.
- While each node in the hypergraph denotes an item, a hyperedge can connect the set of items a user interacts with in the short time period altogether
- In online platforms with millions of available items and churn in new items, recommendation systems act as an essential component to connect users with interesting items
- To model the influence of item embeddings in the past time periods, we develop a residual gating layer to combine the dynamic item embeddings of the previous time period with the static item embeddings to generate the input for the hypergraph convolutional network (HGCN)
- With extensive experiments on datasets covering different online platforms including ecommerce websites (Amazon and Etsy) and an information sharing community (Goodreads), the proposed model outperforms state-of-the-art models in providing Top-K next-item recommendation
- We introduce the details of the proposed HyperRec, centered around three guiding research questions: RQ1 How to define correlations between items with a hypergraph structure and how to effectively incorporate the short-term item correlations into dynamic item embeddings by considering multi-hop connections between items? RQ2 While the meaning of items in the past can hint on their characteristics in the future, how to link the embedding process at different time periods to connect how the residual information flows between consecutive time periods? RQ3 How to fuse the short-term user intent with the dynamic item embedding to represent each interaction in a user interaction sequence for dynamic user preference modeling?
- As an advanced version of GRU4Rec targeting Top-K recommendation, in Amazon and Goodreads, GRU4Rec+ can improve TCN and HPMN by conducting dynamic user modeling with Gated Recurrent Neural Network (GRU) and adopting a loss function tailored to RNN-based models for Top-K recommendation
- We explore the dynamic meaning of items in realworld scenarios and propose a novel next-item recommendation framework empowered by sequential hypergraphs to incorporate the short-term item correlations for dynamic item embedding
- The authors conduct experiments to evaluate the performance of the proposed HyperRec over datasets sampled from three online platforms (Goodreads, Amazon and Etsy).
- To explore the generalization of the proposed model, the authors sample data from three different online platforms.
- Summary statistics of these datasets are in Table 1
- Evaluation Metrics
Following the leave-one-out setting, in the test data, each user only relates to one item that the user interacts with after the cutting time.
- The newly proposed HGN is equipped with a novel feature-gating and an instance gating to enhance the short-term user modeling, and can outperform the aforementioned baselines
- Both SASRec and Bert4Rec employ a self-attention layer to model the sequential user patterns.
- In BERT4Rec, by randomly masking items in the user sequences, it is able to train a bidirectional model for recommendation
- It does not bring in huge improvement as in the original BERT applications for natural language processing since the right-to-left patterns in sequences are not necessarily informative for predicting dynamic user preferences
- The authors explore the dynamic meaning of items in realworld scenarios and propose a novel next-item recommendation framework empowered by sequential hypergraphs to incorporate the short-term item correlations for dynamic item embedding.
- With the stacking of hypergraph convolution networks, a residual gating and the fusion layer, the proposed model is able to provide more accurate modeling of user preferences, leading to improved performance compared to the state-of-the-art in predicting user’s action for both ecommerce (Amazon and Etsy) and information sharing platform (Goodreads).
- The authors are interested in investigating how to transfer the dynamic patterns across platforms or across domains for an improved predictive performance
- Table1: Statistics of the datasets
- Table2: Comparison of Different Models. ∗ indicates that the improvement of the best result is statistically significant compared with the next-best result with < 0.01
- Table3: Results for Ablation Test under HIT@1/NDCG@1
- Next-item Recommendation. Next-item recommendation has been a promising research topic recently. Compared with recommendation systems treating users as static, it usually updates a user’s status after each of her interactions and generates predictions relying on the relationships between items consumed sequentially. Some works focus on recommendation for short-term interaction sessions without user identification, which usually assume that items in a session are highly correlated with each other and center around an intense intent [26, 41].
Another line of research models user preferences with historic item sequences spanning a longer period of time. Pioneering works adopt Markov Chains  and translation-based  methods to model the transition between items that a user interacted with sequentially. Recently, there are lots of efforts in applying different neural networks to capture users’ dynamic preferences from their sequential behaviors. GRU4Rec  utilizes a Gated Recurrent Neural Network (GRU) to investigate users’ sequential interactions and then GRU4Rec+  is proposed as a modified version with a new class of loss function designed for the Top-K recommendation. Meanwhile, Convolutional Neural Networks (CNN) are adopted by [32, 44] to capture the sequential patterns of users’ historic interactions. While self-attention layer (transformer)  is proposed to be an effective replacement for RNN and CNN in handling sequential data, it is adopted in SASRec  to extract user preferences from the interactions in the past. However, these methods focus on modeling the sequential patterns without considering the temporal effects, leading to similar latent representations for interactions happening at different time periods or from various users.
- This work was supported in part by NSF grant IIS-1841138
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