Automatic text classification using machine learning is significantly affected by the text representation model. The structural information in text is necessary for natural language understanding, which is usually ignored in vector-based representations. In this paper, we present a graph kernel-based text classification framework which utilises the structural information in text effectively through the weighting and enrichment of a graph-based representation. We introduce weighted co-occurrence graphs to represent text documents, which weight the terms and their dependencies based on their relevance to text classification. We propose a novel method to automatically enrich the weighted graphs using semantic knowledge in the form of a word similarity matrix. The similarity between enriched graphs, knowledge-driven graph similarity, is calculated using a graph kernel. The semantic knowledge in the enriched graphs ensures that the graph kernel goes beyond exact matching of terms and patterns to compute the semantic similarity of documents. In the experiments on sentiment classification and topic classification tasks, our knowledge-driven similarity measure significantly outperforms the baseline text similarity measures on five benchmark text classification datasets.
|Number of pages||15|
|Journal||International Journal of Machine Learning and Cybernetics|
|Early online date||19 Nov 2020|
|Publication status||Early online date - 19 Nov 2020|
Bibliographical noteFunding Information:
The authors would like to acknowledge the support from Ulster University through the Vice Chancellor’s Research Scholarship (VCRS) Award.
© 2020, The Author(s).
Copyright 2020 Elsevier B.V., All rights reserved.
- Automatic text classification
- Document similarity measure
- Graph enrichment
- Graph kernels
- Graph-based text representation
- Supervised term weighting
ASJC Scopus subject areas
- Computer Vision and Pattern Recognition
- Artificial Intelligence