RLHF from scratch: SFT, a reward model, and PPO on a KL leash
Article summary
Quick briefing — cleaned from the original RSS feed
Pretraining gives a language model knowledge. It does not give it manners. A base model has read the internet and can continue any text fluently, but ask it "give me three tips to sleep better" and it may cheerfully reply with five tips to eat healthier and an invitation to subscribe to a newsletter — it treats your instruction as a document to keep writing. RLHF is how that raw capability gets turned into an assistant you can actually talk to. I built an interactive walkthrough of all three…
1Key Takeaways
- Pretraining gives a language model knowledge.
- A base model has read the internet and can continue any text fluently, but ask it "give me three tips to sleep better" and it may cheerfully reply with five tips to eat healthier and an invitation to subscribe to a newsletter — it treats your instruction as a document to keep writing.
- RLHF is how that raw capability gets turned into an assistant you can actually talk to.
- I built an interactive walkthrough of all three….
2AIWedia Score
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3Why it matters
Coding AI shifts how fast software ships and how much human review each change needs. DEV — ML reports that pretraining gives a language model knowledge.
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