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DetectGPT: Zero-Shot Machine-Generated Text Detection using Probability Curvature

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arxiv 2301.11305 v2 pith:VB25AQFT submitted 2023-01-26 cs.CL cs.AI

DetectGPT: Zero-Shot Machine-Generated Text Detection using Probability Curvature

classification cs.CL cs.AI
keywords detectgptdetectiongeneratedmodeltextprobabilityzero-shotauroc
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The increasing fluency and widespread usage of large language models (LLMs) highlight the desirability of corresponding tools aiding detection of LLM-generated text. In this paper, we identify a property of the structure of an LLM's probability function that is useful for such detection. Specifically, we demonstrate that text sampled from an LLM tends to occupy negative curvature regions of the model's log probability function. Leveraging this observation, we then define a new curvature-based criterion for judging if a passage is generated from a given LLM. This approach, which we call DetectGPT, does not require training a separate classifier, collecting a dataset of real or generated passages, or explicitly watermarking generated text. It uses only log probabilities computed by the model of interest and random perturbations of the passage from another generic pre-trained language model (e.g., T5). We find DetectGPT is more discriminative than existing zero-shot methods for model sample detection, notably improving detection of fake news articles generated by 20B parameter GPT-NeoX from 0.81 AUROC for the strongest zero-shot baseline to 0.95 AUROC for DetectGPT. See https://ericmitchell.ai/detectgpt for code, data, and other project information.

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Cited by 18 Pith papers

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