Related Sentiment Research Articles

Improving span-based Aspect Sentiment Triplet Extraction with part-of-speech filtering and contrastive learning

Aspect Sentiment Triple Extraction (ASTE), a subtask of fine-grained sentiment analysis, aims to extract aspect terms, opinion terms, and their corresponding sentiment polarities from sentences. Previous methods often enumerated all possible spans of aspects and opinions as candidate spans that contain many invalid and irrelevant spans. This made the model training and prediction more difficult due to noised spans, leading to poor performance. To address this issue, we first propose a novel span-level approach that explicitly considers prior grammatical knowledge to generate possible candidate spans by part-of-speech filtering. In this way, our approach can make the model easier to be trained and achieve higher performance at the test stage. Besides, the quality of span-level representation of aspects and opinions is crucial for predicting their sentiment relation. To build a high-quality span-level representation of aspects and opinions, we first incorporate the contextual embedding of the entire sequence into span-level representations. Then, we introduce an auxiliary loss based on contrastive learning to make a more compact representation of the same polarities. Experimental evaluations on the 14Lap, 14Res, 15Res, and 16Res datasets demonstrate the effectiveness of our model, achieving state-of-the-art performance in span-based triplet extraction.

The effect of relations between evaluated entities on attitude change

Abstract It was hypothesized that the nature of the relation linking two evaluated elements in a cognitive system affects the operation of the congruity principle. In a before-after design, groups of 5s evaluated writers and prose passages on semantic differential scales, Each group received different information which linked writers and passages. On the pretext of a memory test, writers and passages were re-evaluated. The knowledge that a writer wrote a passage (unit relation) produced more change toward congruity in evaluation of both writer and passage than the knowledge that he liked it (sentiment relation). Double or mixed relations (unit and sentiment relations together) exercised a pressure toward congruity which appeared to represent an intermediate value between the pressures exerted by unit and sentiment relations when they functioned separately.