Module ivf 

IVF (Inverted File Index) module for vector search

This module provides routing and assignment infrastructure shared by float PQ payloads and exact packed binary payloads:

• coarse - Coarse centroids for IVF partitioning (k-means clustering)
• soar - SOAR (Spilling with Orthogonality-Amplified Residuals) for better recall

Structs

CoarseCentroids

Coarse centroids for IVF - trained once, shared across all segments

CoarseConfig

Configuration for coarse quantizer

IvfProbePlan

A centroid selection computed once and reused by every segment.

MultiAssignment

Multi-cluster assignment result from SOAR

SoarConfig

Configuration for SOAR (Spilling with Orthogonality-Amplified Residuals)

Constants

BINARY_HNSW_AUTO_THRESHOLD

Automatic routing switch for packed binary centroids.

HIERARCHICAL_TRAINING_THRESHOLD

Codebook size past which coarse training becomes hierarchical.

HNSW_AUTO_THRESHOLD

Automatic routing switches to a centroid graph at this leaf count.