Evolutionary Simulation of Online Public Opinion Based on the BERT-LDA Model under COVID-19

ABSTRACT

The construction of a large-scale online public opinion evolution simulation model has guidance value for differentiated emergency management and public opinion guidance in the worst-hit areas in Wuhan and the other areas in China during the outbreak of the COVID-19. In order to realize the fine-grained simulation of the public sentiment evolution of the topic, the LDA topic model is deeply integrated with BERT word vector to optimize the topic vector and power the text topic clustering. At the same time, on the basis of improving BERT pre-training task, the deep pre-training task is superimposed to improve the accuracy of the model in emotion classification. The results show that the NPMI value of the improved BERT-LDA model is 0.357 higher than that of the original LDA model during the topic vector training. In terms of the emotional classification task of epidemic events, the AUC value exceeds 99.6%, which proves that the improved BERT-LDA model can be effectively applied to large-scale internet public opinion evolution simulation. © 2021, The Editorial Board of Journal of System Simulation. All right reserved.