Hi everyone,

We have recently written an article on HF’s blog on automatic hallucination detection using inconsistency scoring. The main idea is that hallucinations happen because the task asked at inference is not seen in the training set, which implies low confidence in the next token, therefore, inconsistent samples from the same prompt (https://arxiv.org/abs/2309.13638).

We look at the use of SelfCheckGPT NLI (https://arxiv.org/abs/2303.08896), an example of inconsistency scoring, on WikiBio and found that such a metric has high precision (aka flagged hallucinations indeed are ones) and calibrated recall (high scores = high chance of flagging hallucinations).

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https://preview.redd.it/r0o5j4v64y2c1.png?width=1189&format=png&auto=webp&s=9208060f4f8268319e6c4364d2833798749bc6de

This is quite promising as it could open the way to having AI systems that are more reliable, aka when the task is easy, we let the AI do it. When we detect it’s too hard and the model is hallucinating, we put a human in the loop.

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https://i.redd.it/hbhky9n74y2c1.gif

We have provided:

• An article on HF Blog: https://huggingface.co/blog/dhuynh95/automatic-hallucination-detection
• A Gradio demo to see the metric in action: https://huggingface.co/spaces/mithril-security/hallucination_detector
• A Colab notebook to reproduce our results: https://colab.research.google.com/drive/1Qhq2FO4FFX_MKN5IEgia_PrBEttxCQG4?usp=sharing

We conducted these tests as part of our mission to build Confidential and Trustworthy Conversational AI. You can check out our core project, BlindChat, an open-source and Confidential Conversational AI (aka any data sent to our AI remains private, and not even our admins can see your prompts) at https://github.com/mithril-security/blind_chat/