Struct TurboQuantProd 

pub struct TurboQuantProd { /* private fields */ }

Unbiased inner-product TurboQuant quantizer.

Implementations

impl TurboQuantProd

pub fn new( dimension: usize, bits: u8, mse_seed: u64, qjl_seed: u64, ) -> Result<Self, QuantError>

Create a new inner-product quantizer.

• dimension: vector dimensionality
• bits: total bit-width per coordinate (must be ≥ 2)
• mse_seed: seed for the MSE rotation matrix
• qjl_seed: seed for the QJL projection (must differ from mse_seed)

pub fn dimension(&self) -> usize

The dimension this quantizer operates on.

pub fn bits(&self) -> u8

The total bit-width per coordinate.

pub fn quantize(&self, x: &[f32]) -> Result<QuantizedProdVector, QuantError>

Quantize a vector.

pub fn dequantize( &self, q: &QuantizedProdVector, ) -> Result<Vec<f32>, QuantError>

Dequantize a vector.

Returns x̃ = x̃_mse + x̃_qjl where x̃_qjl = (√(π/2)/d) · γ · S^T · qjl

pub fn inner_product_estimate( &self, query: &[f32], q: &QuantizedProdVector, ) -> Result<f32, QuantError>

Estimate ⟨query, quantized_x⟩ without full dequantization.

Computes: ⟨query, x̃_mse⟩ + QJL_estimate(query, qjl_bits, γ)