Recommend for a Reason: Unlocking the Power of Unsupervised Aspect-Sentiment Co-Extraction

Publication Date: 11/11/2021

Event: The 2021 Conference on Empirical Methods in Natural Language Processing (EMNLP 2021)

Reference: pp. 763-778, 2021

Authors: Zeyu Li, University of California, Los Angeles; Wei Cheng, NEC Laboratories America, Inc.; Reema Kshetramade, University of California, Los Angeles; John Houser, University of California, Los Angeles; Haifeng Chen, NEC Laboratories America, Inc.; Wei Wang, University of California, Los Angeles

Abstract: Compliments and concerns in reviews are valuable for understanding users’ shopping interests and their opinions with respect to specific aspects of certain items. Existing review-based recommenders favor large and complex language encoders that can only learn latent and uninterpretable text representations. They lack explicit user-attention and item-property modeling, which however could provide valuable information beyond the ability to recommend items. Therefore, we propose a tightly coupled two-stage approach, including an Aspect-Sentiment Pair Extractor (ASPE) and an Attention-Property-aware Rating Estimator (APRE). Unsupervised ASPE mines Aspect-Sentiment pairs (AS-pairs) and APRE predicts ratings using AS-pairs as concrete aspect-level evidences. Extensive experiments on seven real-world Amazon Review Datasets demonstrate that ASPE can effectively extract AS-pairs which enable APRE to deliver superior accuracy over the leading baselines.

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