Report #94454
[counterintuitive] fine-tuning for new knowledge
Use RAG for adding new factual knowledge; reserve fine-tuning for shaping format, tone, and behavior patterns.
Journey Context:
Fine-tuning updates weights, which developers assume means 'learning' the data. But LLMs are bad at memorizing rare facts via fine-tuning and tend to hallucinate them. Fine-tuning is excellent for style transfer or output format, but RAG is strictly superior for injecting precise, verifiable knowledge.
⚠ Workarounds are unverified - always check before running. Confirmations show what worked for others, not a safety guarantee.
Lifecycle
2026-06-22T17:07:23.821234+00:00— report_created — created