Investigating the Impact of Text Summarization on Topic Modeling
This work addresses the challenge of enhancing topic modeling for larger documents by reducing noise, but it is incremental as it builds on existing neural topic models with summarization.
The paper tackles the problem of improving topic modeling performance by using a pre-trained large language model to generate document summaries before topic modeling, finding that this approach yields better topic diversity and comparable coherence values.
Topic models are used to identify and group similar themes in a set of documents. Recent advancements in deep learning based neural topic models has received significant research interest. In this paper, an approach is proposed that further enhances topic modeling performance by utilizing a pre-trained large language model (LLM) to generate summaries of documents before inputting them into the topic model. Few shot prompting is used to generate summaries of different lengths to compare their impact on topic modeling. This approach is particularly effective for larger documents because it helps capture the most essential information while reducing noise and irrelevant details that could obscure the overall theme. Additionally, it is observed that datasets exhibit an optimal summary length that leads to improved topic modeling performance. The proposed method yields better topic diversity and comparable coherence values compared to previous models.