

Inverted File index with FLAT (uncompressed) vectors, partitioning the vector space into clusters with centroids, offering a balance between search speed and accuracy for approximate nearest neighbor search.
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IVF-FLAT (Inverted File with FLAT vectors) is an indexing method that partitions the vector space into clusters, with each cluster having a centroid. Vectors are stored in their original, uncompressed form (FLAT) within their assigned clusters.
Higher accuracy than IVF-PQ because:
Higher memory usage than IVF-PQ:
vs IVF-PQ:
vs HNSW:
Implemented in open-source libraries (FAISS, Milvus, etc.)