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---
title: "Hallucination"
type: concept
tags: [hallucination, llm, problem, reliability]
aliases: [Hallucination, 幻觉, 大模型幻觉, LLM 幻觉]
last_updated: 2025-12-20
---
## Definition
Hallucination幻觉大语言模型在面对陌生领域或缺乏足够知识的问题时"一本正经地胡说八道",给出看似合理但实际错误答案的现象。
## Key Facts
- 本质原因LLM 的知识局限于训练数据集,面对未知领域时无法真实"理解",只能基于概率生成最可能的下一个词
- 类比LLM 在陌生领域"只会写一个解字",然后放飞自我
- [[RAG]] 是解决幻觉的主要技术手段之一(通过外部知识引导)
- 其他方法模型微调、Prompt Engineering、Chain-of-Thought
## Connections
- [[RAG]] ← 解决 ← [[Hallucination]]
- [[Large Language Model]] ← 问题 ← [[Hallucination]]
## Sources
- [[大模型相关术语和框架总结llm-mcp-prompt-rag-vllm-token-数据蒸馏]]