Struct SSPEncoder

pub struct SSPEncoder { /* private fields */ }

The SSPEncoder converts an input sample (a point in some domain) into an SSP vector.

For simplicity, it assumes the input is a slice of f32 values with length equal to domain_dim. Internally, it stores a set of frequency means to compute phase values that are then converted into cosine/sine pairs to form the SSP vector.

Implementations

impl SSPEncoder

pub fn new(ssp_dim: usize, domain_dim: usize, rng: &mut impl Rng) -> Self

Creates a new SSPEncoder.

Arguments

• ssp_dim - The dimension of the SSP vector (must be even to allow cosine/sine pairs).
• domain_dim - The dimensionality of the input sample.
• rng - A mutable reference to a random number generator.

Panics

Panics if ssp_dim is not even.

pub fn update_lengthscale(&mut self, ls: f32)

Updates the lengthscale parameter.

The lengthscale is used to scale the dot products when computing phases.

Arguments

• ls - The new lengthscale value.

pub fn encode(&self, x: &[f32]) -> Vec<f32>

Encodes a single input sample into an SSP vector.

The input sample is expected to have length equal to domain_dim. The encoder computes phase values using dot products with the frequency means, scales them by the lengthscale, and then converts each phase into a cosine and sine pair.

Arguments

• x - A slice of f32 values representing the input sample.

Returns

A vector of f32 values of length ssp_dim representing the encoded SSP.

Panics

Panics if the length of x does not equal domain_dim.