Qdrant's Turbo4 vector compression eliminates full-precision safety check, study finds

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A benchmark study compared Qdrant 1.19's Turbo4 datatype against the previous TurboQuant model. Turbo4 compresses vectors to 4 bits and eliminates storage of original full-precision vectors, reducing collection storage by ninefold. This contrasts with TurboQuant's dual-copy approach which retains original vectors for rescoring to correct quantization errors. The change removes the traditional safety net that ensured high retrieval accuracy in prior versions. The trade-off prioritizes storage efficiency over the ability to double-check search results against uncompressed data.

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