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AiSAQ holds query-time RAM at 10 MB on a billion-vector index by moving PQ codes to SSD
DiskANN keeps product-quantized vectors for every node resident in RAM, so its footprint tracks the corpus. A paper on arxiv puts those codes on storage instead and reports millisecond-order latency at 95 percent 1-recall@1.
Publishers:arxiv.org
Reality
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