Why it matters

ScaNN is Google's ANN. Understanding shapes vector DB choices.

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The architecture

Anisotropic loss: emphasize inner-product preservation.

Partition + quantize.

SIMD-optimized.

ScaNN structureAnisotropic losspreserve inner productPartition + quantizeIVF + AHSIMD searchhighly optimizedGuo et al. 2020; Vertex AI Vector Search uses; strong on ANN benchmarks
ScaNN.
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How it works end to end

Guo et al. 2020.

Open-source + Vertex Vector Search.

Top ANN-Benchmarks results.