Aspect level sentiment analysis based on relation gated graph convolutional network

In aspect level sentiment analysis, existing methods struggle to effectively utilize the types of syntactic relations, and the performance of the model is affected by the accuracy of the dependency parsing. To resolve these challenges, an attention augmented relation gated graph convolutional network (ARGCN) model was proposed. The model uses a bidirectional long-short-term memory (BiLSTM) network to learn the sequential feature of sentences, and combines feature with the dependency probability matrix to construct a word graph. Then the model uses a relation gated graph convolutional network (RG-GCN) and an attention augmented network (AAN) to obtain the sentiment features of aspect words from the word graph and the sequential feature of sentences, respectively. Finally, the outputs of RG-GCN and AAN are concatenated as the final sentiment feature of aspect words. Contrastive experiments and ablation experiments were conducted on SemEval 2014 and Twitter datasets. And the results show that the ARGCN model can effectively utilize relation types, reduce the impact of dependency parsing accuracy on its performance, and better establish the connection between aspect words and opinion words. The model accuracy is better than all baseline models. © 2023 Zhejiang University. All rights reserved.