sporse

Sparse vector index for learned sparse retrieval.

Indexes sparse vectors (SPLADE, LADE) using an inverted index with Block-Max WAND traversal for exact top-k inner product search.

Usage

use sporse::{SparseVec, SporseIndex};

let mut index = SporseIndex::new();

index.insert(0, &SparseVec::new(vec![(0, 1.0), (3, 2.5), (7, 0.8)]));
index.insert(1, &SparseVec::new(vec![(1, 3.0), (3, 1.0)]));
index.insert(2, &SparseVec::new(vec![(0, 0.5), (7, 2.0)]));

index.build();

let query = SparseVec::new(vec![(0, 1.0), (3, 1.0)]);
let results = index.search(&query, 2);
// [(0, 3.5), (1, 1.0)] -- doc 0 scores highest

Features

• serde -- Serialize/Deserialize for SparseVec