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# 第四课:XTuner 大模型单卡低成本微调实战 | ||
1. Finetune简介 | ||
两种微调模式: | ||
- 增量预训练:让模型学到新知识 | ||
- 指令跟随:学会对话 | ||
2. 指令跟随微调的角色: | ||
- System:上下文 | ||
- User:提问者 | ||
- Asistant:AI | ||
不同大语言模型对话模板不同 | ||
3. 增量预训练微调 | ||
System和User留空,只需要Asistant | ||
4. LoRA & QLoRA | ||
LoRA不更新底模。 | ||
QLoRA量化4-bit,自动在cpu和gpu之间调度 | ||
5. XTuner | ||
支持多个大预言模型 | ||
6. 快速上手 |