IVF Vector Search: Search Fewer Vectors
Brute-force vector search compares every embedding. How an IVF index partitions vectors into cells, probes only the nearest, and where the nprobe knob bites.
#FAISS(2)
Product Quantization for Vector Search
HNSW makes vector search fast, but the embeddings still fill your RAM. Product quantization compresses them ~32x with a small recall hit. Here is how it works.