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Embedding Model Selection and Migration (ANSWERED)

Scenario BasedRAGMedium15 min read

Medium RAG interview question on embedding model selection and migration — architecture, trade-offs, eval, and production patterns.

TL;DR — Quick Answer

Benchmark candidate embedders on your domain golden set (nDCG, recall@k). Migration needs blue/green re-embedding, dimension compatibility, dual-read period, and retrieval quality monitoring before cutover.

The Interview Question

Explain embedding model selection and migration. How would you design, implement, and evaluate this in a production RAG system? Discuss trade-offs and failure modes.

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