tBART: Abstractive summarization based on the joining of Topic modeling and BART

Topic information has been helpful to direct semantics in text summarization. In this paper, we present a study on a novel and efficient method to incorporate the topic information with the BART model for abstractive summarization, called the tBART. The proposed model inherits the advantages of the BART, learns latent topics, and transfers the topic vector of tokens to context space by an align function. The experimental results illustrate the effectiveness of our proposed method, which significantly outperforms previous methods on two benchmark datasets: XSUM and CNN/DAILY MAIL.