Which is generally most effective for grounding an LLM in private data?

Retrieval-augmented generation (RAG)

Best first step when RAG quality is poor?

Inspect retrieved chunks to isolate retrieval vs generation

Immediately fine-tune the model

Which vector index suits a 100M-vector, low-latency app?

Approximate ANN index (HNSW/IVF-PQ)

Exact brute-force (flat) search

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