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Mohit Sharma

NOTES

Engineering notes

Things I had to understand properly before I could explain them. Written while the confusion was still fresh, which is the only time the explanation is any use.

2026

  • 2026.09.18

    Why do we need rerankers after vector search?

    Vector search returns neighbours, not answers. A reranker is the only stage allowed to read the question and the document at the same time, and that turns out to be the whole difference.

    5 minRetrievalAI infrastructure