💡 The paper addresses the challenge of financial sentiment analysis, which is crucial for investment decision-making. Traditional natural language processing models are limited by their size and training data, resulting in poor generalization and effectiveness. Large Language Models, despite their superior performance in various NLP tasks, also face challenges in financial sentiment analysis due to the discrepancy between their pre-training objective and the task of predicting sentiment labels. Additionally, the concise nature of financial news often lacks sufficient context, which can compromise the reliability of Large Language Models' sentiment analysis.

To overcome these challenges, the authors propose a retrieval-augmented Large Language Model framework. This framework consists of two modules: an instruction-tuned Large Language Model module that ensures the model behaves as a predictor of sentiment labels, and a retrieval-augmentation module that retrieves additional context from reliable external sources. This approach enables the model to leverage external context to improve its sentiment analysis capabilities.

The authors evaluate their framework against traditional models and other Large Language Models, such as ChatGPT and LLaMA. The results show that their approach achieves a significant performance gain, with improvements in accuracy and F1 score ranging from 15% to 48%. This demonstrates the effectiveness of the proposed retrieval-augmented Large Language Model framework in enhancing financial sentiment analysis. Overall, the paper contributes to the development of more accurate and reliable financial sentiment analysis models, which can inform better investment decisions.