Struct Int8Quantizer 

pub struct Int8Quantizer { /* private fields */ }

Per-dimension affine Int8 quantizer.

Maps each dimension independently: u8_val = round((f32_val - offset) / scale * 255) where offset = min and scale = max - min per dimension.

Trained from sample vectors to learn the per-dimension ranges.

Implementations

impl Int8Quantizer

pub fn train(vectors: &[Vec<f32>]) -> Result<Self, DiskAnnError>

Train an Int8 quantizer from sample vectors.

Computes per-dimension min/max to establish the affine mapping.

pub fn from_params(dim: usize, scales: Vec<f32>, offsets: Vec<f32>) -> Self

Create from pre-computed scales and offsets.

pub fn dim(&self) -> usize

Get the vector dimension.

pub fn scales(&self) -> &[f32]

Get the per-dimension scales.

pub fn offsets(&self) -> &[f32]

Get the per-dimension offsets (min values).

pub fn save(&self, path: &str) -> Result<(), DiskAnnError>

Save to file.

pub fn load(path: &str) -> Result<Self, DiskAnnError>

Load from file.

pub fn stats(&self) -> SQStats

Get stats.

Trait Implementations

impl Clone for Int8Quantizer

fn clone(&self) -> Int8Quantizer

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Int8Quantizer

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Int8Quantizer

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for Int8Quantizer

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl VectorQuantizer for Int8Quantizer

fn encode(&self, vector: &[f32]) -> Vec<u8>

Encode a float vector into compressed bytes.

fn decode(&self, codes: &[u8]) -> Vec<f32>

Decode compressed bytes back to an approximate float vector.

fn asymmetric_distance(&self, query: &[f32], codes: &[u8]) -> f32

Compute asymmetric distance: exact query vs quantized database vector.

fn compression_ratio(&self, dim: usize) -> f32

Compression ratio for a given dimension (original bytes / compressed bytes).