Enum VectorIndexBackend 

pub enum VectorIndexBackend {
    Vamana(VamanaIndex),
    Spann(SpannIndex),
}

Unified vector index backend supporting Vamana and SPANN

Variants

Vamana(VamanaIndex)

Spann(SpannIndex)

Implementations

impl VectorIndexBackend

pub fn auto(config: BackendConfig, expected_vectors: usize) -> Result<Self>

Create backend with auto-selection based on expected vector count

pub fn new_vamana(config: BackendConfig) -> Result<Self>

Create Vamana backend explicitly

pub fn new_spann(config: BackendConfig) -> Result<Self>

Create SPANN backend explicitly

pub fn backend_type(&self) -> BackendType

Get backend type

pub fn add_vector(&mut self, vector: Vec<f32>) -> Result<u32>

Add a vector to the index, returns vector ID

pub fn search(&self, query: &[f32], k: usize) -> Result<Vec<(u32, f32)>>

Search for k nearest neighbors

pub fn len(&self) -> usize

Number of vectors in the index

pub fn is_empty(&self) -> bool

Check if index is empty

pub fn save_to_file(&self, path: &Path) -> Result<()>

Save index to file

pub fn load_from_file(path: &Path, backend_type: BackendType) -> Result<Self>

Load index from file

pub fn build(&mut self, vectors: Vec<Vec<f32>>) -> Result<()>

Build index from vectors (for SPANN, Vamana builds incrementally)

pub fn needs_rebuild(&self) -> bool

Check if index needs rebuild (Vamana only)

pub fn auto_rebuild_if_needed(&mut self) -> Result<bool>

Auto-rebuild if needed (Vamana only)

pub fn incremental_insert_count(&self) -> usize

Get incremental insert count (Vamana only)

pub fn deleted_count(&self) -> usize

Get deleted count (Vamana only)

pub fn deletion_ratio(&self) -> f32

Get deletion ratio (Vamana only)

pub fn needs_compaction(&self) -> bool

Check if needs compaction (Vamana only)

pub fn verify_index_file(path: &Path, backend_type: BackendType) -> Result<bool>

Verify index file integrity