From Stars to Insights: Exploration and Implementation of Unified Sentiment Analysis with Distant Supervision

Sentiment analysis is integral to understanding the voice of the customer and informing businesses' strategic decisions. Conventional sentiment analysis involves three separate tasks: aspect-category detection (ACD), aspect-category sentiment analysis (ACSA), and rating prediction (RP). However, independently tackling these tasks can overlook their interdependencies and often requires expensive, fine-grained annotations. This paper introduces Unified Sentiment Analysis (Uni-SA), a novel learning paradigm that unifies ACD, ACSA, and RP into a coherent framework. To achieve this, we propose the Distantly Supervised Pyramid Network (DSPN), which employs a pyramid structure to capture sentiment at word, aspect, and document levels in a hierarchical manner. Evaluations on multi-aspect review datasets in English and Chinese show that DSPN, using only star rating labels for supervision, demonstrates significant efficiency advantages while performing comparably well to a variety of benchmark models. Additionally, DSPN's pyramid structure enables the interpretability of its outputs. Our findings validate DSPN's effectiveness and efficiency, establishing a robust, resource-efficient, unified framework for sentiment analysis.