Struct ImpactIndex 

pub struct ImpactIndex { /* private fields */ }

The impact index.

Implementations

impl ImpactIndex

pub fn build(docs: &[SparseVector], vocab: u32) -> Result<Self, HmsError>

Builds the index over docs (document id = position) with a vocabulary of vocab terms. Weights are quantized to impacts 1..=255 with scale = max weight / 255; weights that round to zero are dropped.

pub fn documents(&self) -> u32

pub fn vocab(&self) -> u32

pub fn postings(&self) -> u64

Stored postings.

pub fn bytes(&self) -> usize

Bytes of the index: block directory, payload, and the per-term tables.

pub fn scale(&self) -> f32

Quantization step of the impacts.

pub fn score_document(&self, query: &SparseVector, doc: u32) -> f32

Exact score of document doc for query over the quantized impacts (reference).

pub fn top_k(&self, query: &SparseVector, k: usize) -> Vec<(u32, f32)>

The k best documents by dot product with query (score descending, ties by id), exact over the quantized impacts.