FHSI-GNN: Fusion Hierarchical Structure Information Graph Neural Network for Extractive Long Documents Summarization

Extractive text summarization aims to select salient sentences from documents. However, most existing extractive methods struggle to capture inter-sentence relations in long documents. In addition, the hierarchical structure information of the document is ignored. For example, some scientific documents have fixed chapters, and sentences in the same chapter have the same theme. To solve these problems, this paper proposes a Fusion Hierarchical Structure Information Graph Neural Network for Extractive Long Documents Summarization. The model constructs a section node containing sentence nodes and global information according to the document structure. It integrates the hierarchical structure information of the text and uses position information to identify sentences. The section node acts as an intermediary node for information interaction between sentences, which better enriches the relationships between sentences and has higher computational efficiency. Our model has achieved excellent results on two datasets, PubMed and arXiv. Further analysis shows that the hierarchical structure information of documents helps the model select salient content better.