Enum QuantizationKind 

#[non_exhaustive]
pub enum QuantizationKind {
    Sq8,
    Pq,
    RaBitQ,
    Bbq,
    Binary,
    Ternary,
    Opq,
    None,
}

Which quantization codec to use during traversal and optionally rerank.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Sq8

8-bit scalar quantization (~0.97 recall with no rerank).

Pq

Product quantization (~0.92 recall).

RaBitQ

1-bit RaBitQ with O(1/√D) error bound (SIGMOD 2024).

Bbq

Better Binary Quantization — centroid-centered asymmetric 1-bit + rerank.

Binary

Raw sign-bit binary (cheap; ~0.85 recall without rerank).

Ternary

BitNet 1.58 trit-packed ternary.

Opq

OPQ — learned rotation applied before PQ.

None

No quantization — FP32 distance in hot path.

Trait Implementations

impl Clone for QuantizationKind

fn clone(&self) -> QuantizationKind

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for QuantizationKind

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

Formats the value using the given formatter.

impl PartialEq for QuantizationKind

fn eq(&self, other: &QuantizationKind) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for QuantizationKind

impl Eq for QuantizationKind

impl StructuralPartialEq for QuantizationKind