Benchmarking Large Language Models in Retrieval-Augmented Generation
Authors: Jiawei Chen, Hongyu Lin, Xianpei Han, Le Sun
AI-generated Key Points
- Authors address the issue of hallucination in large language models (LLMs)
- Propose the use of Retrieval-Augmented Generation (RAG) to mitigate this problem
- Introduce a new corpus called Retrieval-Augmented Generation Benchmark (RGB)
- RGB corpus divided into four separate testbeds based on fundamental abilities required
- Evaluate six representative LLMs on RGB to diagnose challenges faced by current models
- LLMs struggle with negative rejection, information integration, and dealing with false information
- More work needed before effectively applying RAG to LLMs
- Paper provides insights into limitations and challenges of using RAG for LLMs
- Establish benchmark and evaluate multiple LLMs across various abilities required for RAG
Abstract: Retrieval-Augmented Generation (RAG) is a promising approach for mitigating the hallucination of large language models (LLMs). However, existing research lacks rigorous evaluation of the impact of retrieval-augmented generation on different large language models, which make it challenging to identify the potential bottlenecks in the capabilities of RAG for different LLMs. In this paper, we systematically investigate the impact of Retrieval-Augmented Generation on large language models. We analyze the performance of different large language models in 4 fundamental abilities required for RAG, including noise robustness, negative rejection, information integration, and counterfactual robustness. To this end, we establish Retrieval-Augmented Generation Benchmark (RGB), a new corpus for RAG evaluation in both English and Chinese. RGB divides the instances within the benchmark into 4 separate testbeds based on the aforementioned fundamental abilities required to resolve the case. Then we evaluate 6 representative LLMs on RGB to diagnose the challenges of current LLMs when applying RAG. Evaluation reveals that while LLMs exhibit a certain degree of noise robustness, they still struggle significantly in terms of negative rejection, information integration, and dealing with false information. The aforementioned assessment outcomes indicate that there is still a considerable journey ahead to effectively apply RAG to LLMs.
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