mindmap root((Model Customization)) No Model Changes Prompt Engineering Zero-shot Few-shot Chain-of-thought Cost: $ Time: Minutes External Knowledge RAG Knowledge Base Vector DB OpenSearch Cost: $$ Time: Hours-Days Model Changes Transfer Learning Fine-tuning WITH LABELS Traditional Fine-tuning Single task Input-Output pairs Sentiment analysis Instruction Tuning Multi-task Instruction-Response ChatGPT, Claude WITHOUT LABELS Continued Pre-training Domain corpus Terminology learning Medical/Legal models Cross-cutting Domain Adaptation Via Pre-training Via Fine-tuning Via RAG