Inference to the Best Explanation in Large Language Models

• URL: http://arxiv.org/abs/2402.10767v2
• Date: Sun, 02 Mar 2025 20:33:20 GMT
• Title: Inference to the Best Explanation in Large Language Models
• Authors: Dhairya Dalal, Marco Valentino, André Freitas, Paul Buitelaar,
• Abstract summary: This paper proposes IBE-Eval, a framework inspired by philosophical accounts on Inference to the Best Explanation (IBE)<n>IBE-Eval estimates the plausibility of natural language explanations through a combination of explicit logical and linguistic features.<n>Experiments reveal that IBE-Eval can successfully identify the best explanation with up to 77% accuracy.
• Score: 14.846962816266188
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: While Large Language Models (LLMs) have found success in real-world applications, their underlying explanatory process is still poorly understood. This paper proposes IBE-Eval, a framework inspired by philosophical accounts on Inference to the Best Explanation (IBE) to advance the interpretation and evaluation of LLMs' explanations. IBE-Eval estimates the plausibility of natural language explanations through a combination of explicit logical and linguistic features including: consistency, parsimony, coherence, and uncertainty. Extensive experiments are conducted on Causal Question Answering (CQA), where \textit{IBE-Eval} is tasked to select the most plausible causal explanation amongst competing ones generated by LLMs (i.e., GPT 3.5 and Llama 2). The experiments reveal that IBE-Eval can successfully identify the best explanation with up to 77\% accuracy ($\approx 27\%$ above random), improving upon a GPT 3.5-as-a-Judge baseline ($\approx+17\%$) while being intrinsically more efficient and interpretable. Additional analyses suggest that, despite model-specific variances, LLM-generated explanations tend to conform to IBE criteria and that IBE-Eval is significantly correlated with human judgment, opening up opportunities for future development of automated explanation verification tools.

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