hallucinate

present singular third person hallucinates · participle present hallucinating · participle past hallucinated · past hallucinated

1. ambitransitiveTo seem to perceive things (with one or more of one's senses) which are not really present; to have visions; to experience a hallucination.

   Synonyms: imagine, see things

2. artificial intelligenceTo produce information that is not supported by the model's training data.

   In case you were wondering, the yahoo url above doesn’t actually exist, the model just hallucinated it.

   2015 May 21, Andrej Karpathy, “The Unreasonable Effectiveness of Recurrent Neural Networks”, in Andrej Karpathy blog

   2 more examples

   Despite maintaining plausible general linguistic capabilities, dialogue models are still unable to fully discern facts and may instead hallucinate factually invalid information. […] Broadly speaking, we say that a neural dialogue system is guilty of hallucinating whenever it generates a factual sentence that is not supported by a valid path in a k-hop subgraph G k c ⊂ G of the original KG anchored around a context entity c. […] The first module flags and masks out hallucinated entities in an existing response and can be trained offline.

   2021 September 14, Nouha Dziri, Andrea Madotto, Osmar Zaiane, Avishek Joey Bose, “Neural Path Hunter: Reducing Hallucination in Dialogue Systems via Path Grounding”, in arXiv:2104.08455 [cs], →DOI, archived from the original on 12 Jan 2023

   Rankin sanctioned Ayala $3,000 and kicked him off the lawsuit after the lawyer admitted incorporating the hallucinated AI-generated cases in the brief. Morgan and Goody were sanctioned $1,000 each.

   2025 February 10, Debra Cassens Weiss, “No. 42 law firm by head count sanctioned over fake case citations generated by AI”, in ABA Journal, archived from the original on 24 Apr 2025