Simon Willison 11/12/2025

Scaling HNSWs

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This article details Salvatore Sanfilippo's work on implementing and scaling HNSW (Hierarchical Navigable Small World) algorithms for vector sets in Redis. It covers his new contributions to the algorithm, such as efficient deletion and updating of indexes, and explains how to scale large vector sets across multiple nodes for parallel reads and writes to handle hundreds of millions of vectors.

Scaling HNSWs

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