Hallucination
When an LLM generates confidently incorrect, fabricated, or nonsensical information.
In more detail
Hallucinations occur because LLMs predict next tokens based on patterns, not facts. They can generate plausible-sounding but false information. Mitigation strategies include retrieval augmented generation (RAG), fact-checking, and fine-tuning with quality data.
Examples
- Citing non-existent research papers
- Inventing facts about events
- Generating false code that seems correct
- Making up biographical details
Related terms
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