sporse 0.3.0

Sparse vector index for learned sparse retrieval (SPLADE, LADE)
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# 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

```rust
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`