IVF

Inverted File index — clusters vectors and searches a subset of lists (nprobe).

When to use

• Larger datasets where HNSW memory is costly
• Tunable speed/recall via probe count

ZVec.NET mapping

Concern	Type / API
Build params	ZVecIvfIndexParam
Query params	ZVecIvfQueryParams (nprobe, scale factor, …)

Pitfalls

• Too-low nprobe hurts recall; too-high hurts latency
• Training/build assumptions follow upstream ZVec — see product docs

Upstream

• zvec.org
• First-party math: Theory: IVF