RecXplainer: Amortized Attribute-based Personalized Explanations for Recommender Systems

TL;DR

RecXplainer is a new method that generates personalized, attribute-based explanations for recommendations, improving transparency and user trust in large, opaque recommender systems.

Contribution

It introduces a novel approach for producing fine-grained, personalized explanations based on user preferences over item attributes, evaluated across multiple datasets and models.

Findings

RecXplainer outperforms five baselines on ten metrics.

It effectively captures user preferences over item attributes.

The method is applicable to various recommender system types.

Abstract

Recommender systems influence many of our interactions in the digital world -- impacting how we shop for clothes, sorting what we see when browsing YouTube or TikTok, and determining which restaurants and hotels we are shown when using hospitality platforms. Modern recommender systems are large, opaque models trained on a mixture of proprietary and open-source datasets. Naturally, issues of trust arise on both the developer and user side: is the system working correctly, and why did a user receive (or not receive) a particular recommendation? Providing an explanation alongside a recommendation alleviates some of these concerns. The status quo for auxiliary recommender system feedback is either user-specific explanations (e.g., "users who bought item B also bought item A") or item-specific explanations (e.g., "we are recommending item A because you watched/bought item B"). However, users bring personalized context into their search experience, valuing an item as a function of that item's attributes and their own personal preferences. In this work, we propose RecXplainer, a novel method for generating fine-grained explanations based on a user's preferences over the attributes of recommended items. We evaluate RecXplainer on five real-world and large-scale recommendation datasets using five different kinds of recommender systems to demonstrate the efficacy of RecXplainer in capturing users' preferences over item attributes and using them to explain recommendations. We also compare RecXplainer to five baselines and show RecXplainer's exceptional performance on ten metrics.