KGUF: A Simple Knowledge-aware Graph-based Recommender System with User-based Semantic Features Filtering

Core Concepts

KGUF effectively selects and integrates user-relevant semantic features from knowledge graphs during the graph learning phase to improve item representation and recommendation performance.

Abstract

The paper proposes a novel recommendation model called KGUF (Knowledge Graph User-based Filtering) that efficiently leverages knowledge graph information to enhance item representations and recommendation accuracy. Key highlights: KGUF learns user and item embeddings through linear propagation on the user-item interaction graph, integrating latent representations for semantic features directly into item representations. KGUF employs a decision tree mechanism to select meaningful semantic features from the knowledge graph and filter out noisy features, ensuring a concise and meaningful representation of users and items. Extensive experiments on three recommendation datasets show that KGUF achieves comparable or superior performance compared to state-of-the-art knowledge-aware and graph-based recommenders, while maintaining a simpler formalization. The paper investigates the impact of negative sampling and tree depth constraints on the decision tree construction, evaluating their effect on the overall recommendation performance.

Stats

The MovieLens 1M dataset contains 1,000,209 ratings from 6,040 users on 3,706 items. The Yahoo! Movies dataset contains 69,846 ratings from 4,000 users on 2,626 items. The Facebook Books dataset contains 18,978 implicit user feedback on 4,000 users and 2,626 items.

Quotes

"Driven by the assumptions above, we propose KGUF, a KGCF model that learns latent representations of semantic features in the KG to better define the item profile." "By leveraging user profiles through decision trees, KGUF effectively retains only those features relevant to users."

Key Insights Distilled From

KGUF

by Salvatore Bu... at arxiv.org 04-01-2024

https://arxiv.org/pdf/2403.20095.pdf

Deeper Inquiries

How can KGUF's performance be further improved by incorporating additional user and item metadata beyond the knowledge graph?

Incorporating additional user and item metadata beyond the knowledge graph can enhance KGUF's performance in several ways. Firstly, by integrating user demographic information such as age, gender, location, or historical behavior patterns, KGUF can create more personalized recommendations tailored to individual user preferences. This additional data can help in better understanding user intent and improving the accuracy of recommendations. Secondly, incorporating item metadata such as genre, release year, popularity, or other descriptive features can enrich the item representation in KGUF. By leveraging this information, the model can better capture the nuances of item characteristics and improve the recommendation quality. For example, including textual descriptions, reviews, or tags associated with items can provide more context for recommendation decisions. Furthermore, incorporating contextual information such as time of day, season, or user context (e.g., device type, browsing history) can enable KGUF to make more relevant and timely recommendations. By considering these contextual factors, the model can adapt its recommendations based on the current user situation, leading to a more engaging user experience.

What are the potential limitations of the decision tree approach used in KGUF, and how could alternative feature selection methods be explored?

The decision tree approach used in KGUF may have some limitations that could impact its performance. One limitation is the potential for overfitting, especially when the trees become too deep or complex. This can lead to a loss of generalization ability and reduced model interpretability. Additionally, decision trees may struggle with capturing complex relationships between features, especially in high-dimensional spaces. To address these limitations, alternative feature selection methods could be explored. One approach is to use ensemble methods such as Random Forest or Gradient Boosting, which combine multiple decision trees to improve predictive performance and reduce overfitting. These ensemble methods can provide more robust and accurate feature selection by aggregating the predictions of multiple trees. Another alternative is to explore feature selection techniques based on statistical methods like Principal Component Analysis (PCA) or feature importance scores from machine learning models. These methods can help identify the most relevant features for recommendation tasks and reduce the dimensionality of the feature space, leading to more efficient and effective models.

How could KGUF's principles be extended to other recommendation tasks, such as sequential recommendation or cross-domain recommendation?

KGUF's principles can be extended to other recommendation tasks such as sequential recommendation or cross-domain recommendation by adapting the model architecture and data representation to suit the specific requirements of these tasks. For sequential recommendation, KGUF can be modified to incorporate sequential patterns in user-item interactions. By considering the temporal order of user actions, the model can capture user preferences over time and make recommendations based on the user's evolving interests. Techniques like Recurrent Neural Networks (RNNs) or Transformer models can be integrated into KGUF to handle sequential data and improve the accuracy of recommendations. For cross-domain recommendation, KGUF can be extended to leverage information from multiple domains or sources to make recommendations. By integrating data from different domains or modalities, the model can provide more diverse and comprehensive recommendations to users. Techniques like multi-task learning or domain adaptation can be employed to transfer knowledge across domains and improve the generalization ability of the model. Overall, by adapting KGUF's principles to different recommendation tasks and exploring suitable model architectures and data representations, the model can be effectively applied to a wide range of recommendation scenarios, enhancing the quality and relevance of recommendations for users.