Struct LinearSketch 

pub struct LinearSketch { /* private fields */ }

A representation of a linear “sketch”, or projection from a higher dimension to a lower-dimension. This struct represents both the sketching matrix itself and information about its pseudoinverse and kernel.

Implementations

impl LinearSketch

pub fn new( in_dimensions: usize, out_dimensions: usize, alpha: f32, ) -> LinearSketch

Generates a new LinearSketch with projection matrix with entries drawn from a zero-centered normal distribution with standard deviation alpha.

pub fn trivial_sketch(dimensions: usize) -> LinearSketch

Creates a LinearSketch which is actually just the identity matrix on the given number of dimensions.

pub fn compress_schmear(&self, schmear: &Schmear) -> Schmear

Given a Schmear, computes its image under this LinearSketch.

pub fn sketch(&self, vec: ArrayView1<'_, f32>) -> Array1<f32>

Sketches the given vector

pub fn get_projection_matrix(&self) -> &Array2<f32>

Gets the matrix representation of this LinearSketch.

pub fn get_kernel_matrix(&self) -> &Option<Array2<f32>>

Gets the kernel of the sketching matrix of this LinearSketch. See kernel.

pub fn get_expansion_matrix(&self) -> &Array2<f32>

Gets the pseudoinverse of the sketching matrix

pub fn get_output_dimension(&self) -> usize

pub fn get_input_dimension(&self) -> usize

Trait Implementations

impl Clone for LinearSketch

fn clone(&self) -> LinearSketch

Returns a duplicate of the value.

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

Performs copy-assignment from source.