Struct E8LatticeCodebook 

#[repr(C, align(64))]
pub struct E8LatticeCodebook {
    pub table: [i8; 1024],
}

E8 Lattice Codebook of 1 KiB. Explicitly aligned to 64 bytes to guarantee residence in exactly 16 contiguous L1d cache lines.

Fields

table: [i8; 1024]

128 centroids x 8 integer coordinates (scaled int8) = 1024 bytes

Implementations

impl E8LatticeCodebook

pub fn new() -> Self

Initializes E8P codebook with canonical E8 half-integer roots scaled by 2 (coordinates in {+1, -1}). Every 8D centroid has an even number of minus signs, satisfying E8 membership.

pub fn decode_nibble(nibble: u8) -> (f32, f32)

Decodes a 4-bit nibble [0..15] back into its 2D constituent weights (w0, w1). Invertible bijection with project_and_encode_to_nibbles. Unbiased symmetric levels in [-1.5, +1.5].

pub fn decode_4_nibbles(nibbles: &[u8; 4], scale: f32) -> [f32; 8]

Decodes 4 4-bit nibbles (2 bytes) back to an 8-dimensional E8 vector.

pub fn project_and_encode_to_nibbles(x: &[f32; 8], scale: f32) -> [u8; 4]

Projects an 8D continuous vector onto the closest vector in the Conway-Sloane half-integer E8 coset (D8 + 1/2*1), then discretizes each 2D sub-vector to 1 of 16 symmetric zero-mean states (4 bits: 2 bits per coordinate). Levels per coordinate: {-1.5, -0.5, +0.5, +1.5} * scale. Strictly unbiased (mean = 0.0).

Trait Implementations

impl Clone for E8LatticeCodebook

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for E8LatticeCodebook

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

Formats the value using the given formatter.

impl Default for E8LatticeCodebook

fn default() -> Self

Returns the “default value” for a type.

impl PartialEq for E8LatticeCodebook

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for E8LatticeCodebook