KIMedQA: towards building knowledge-enhanced medical QA models

Abstract

Medical question-answering systems require the ability to extract accurate, concise, and comprehensive answers. They will better comprehend the complex text and produce helpful answers if they can reason on the explicit constraints described in the question’s textual context and the implicit, pertinent knowledge of the medical world. Integrating Knowledge Graphs (KG) with Language Models (LMs) is a common approach to incorporating structured information sources. However, effectively combining and reasoning over KG representations and language context remains an open question. To address this, we propose the Knowledge Infused Medical Question Answering system (KIMedQA), which employs two techniques viz. relevant knowledge graph selection and pruning of the large-scale graph to handle Vector Space Inconsistent (VSI) and Excessive Knowledge Information (EKI). The representation of the query and context are then combined with the pruned knowledge network using a pre-trained language model to generate an informed answer. Finally, we demonstrate through in-depth empirical evaluation that our suggested strategy provides cutting-edge outcomes on two benchmark datasets, namely MASH-QA and COVID-QA. We also compared our results to ChatGPT, a robust and very powerful generative model, and discovered that our model outperforms ChatGPT according to the F1 Score and human evaluation metrics such as adequacy.