Still No Lie Detector for Language Models: Probing Empirical and Conceptual Roadblocks

Authors: B. A. Levinstein, Daniel A. Herrmann

Results of the summarizing process for the arXiv paper: 2307.00175v1

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This article explores the question of whether large language models (LLMs) have beliefs and how we can measure them. The authors evaluate two existing approaches for measuring LLM beliefs but find that these methods fail to generalize effectively. They argue that even if LLMs have beliefs, these measurement methods are unlikely to be successful due to conceptual reasons. The authors then consider whether LLMs should be expected to have beliefs in the first place and address arguments suggesting that they cannot. They refute these arguments by pointing out a philosophical mistake and providing a more productive framing of the belief status in LLMs. Moreover, they emphasize that determining whether LLMs have beliefs is an empirical matter. The article also provides an overview of transformer architecture, specifically focusing on autoregressive, decoder-only models like OpenAI's GPT series and Meta's LLaMA series. Overall, this article aims to shed light on the status of beliefs in LLMs and suggests potential paths for future research in this area.
AI-generated keywords: LLMs Beliefs Measurement Transformer Architecture Empirical

AI-generated Key Points

  • Large language models (LLMs) and their beliefs
  • Evaluation of existing approaches for measuring LLM beliefs
  • Conceptual limitations of current measurement methods
  • Questioning whether LLMs should be expected to have beliefs
  • Refuting arguments against LLMs having beliefs
  • Emphasizing the empirical nature of determining LLM beliefs
  • Overview of transformer architecture, specifically autoregressive, decoder-only models like GPT and LLaMA series
  • Aim of the article: shedding light on LLM belief status and suggesting future research paths
Also access our AI generated: Comprehensive summary, Lay summary, Blog-like article; or ask questions about this paper to our AI assistant.

Abstract: We consider the questions of whether or not large language models (LLMs) have beliefs, and, if they do, how we might measure them. First, we evaluate two existing approaches, one due to Azaria and Mitchell (2023) and the other to Burns et al. (2022). We provide empirical results that show that these methods fail to generalize in very basic ways. We then argue that, even if LLMs have beliefs, these methods are unlikely to be successful for conceptual reasons. Thus, there is still no lie-detector for LLMs. After describing our empirical results we take a step back and consider whether or not we should expect LLMs to have something like beliefs in the first place. We consider some recent arguments aiming to show that LLMs cannot have beliefs. We show that these arguments are misguided. We provide a more productive framing of questions surrounding the status of beliefs in LLMs, and highlight the empirical nature of the problem. We conclude by suggesting some concrete paths for future work.

Submitted to arXiv on 30 Jun. 2023

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