Struct GrassmannCrossMoment 

pub struct GrassmannCrossMoment { /* private fields */ }

Streaming p × r cross-moment accumulator for the closed-form polar frame update (issue #972). Sums decoder-target outer products Σ_i t_i c_iᵀ (ambient target t_i ∈ ℝ^p against in-span coordinate c_i ∈ ℝ^r) so the frame can be re-polared from accumulated evidence WITHOUT re-touching the border. Accumulation is O(p r) per update and never forms a p × p matrix.

Implementations

impl GrassmannCrossMoment

pub fn new(output_dim: usize, rank: usize) -> Self

Empty p × r accumulator.

pub fn accumulate( &mut self, targets: ArrayView2<'_, f64>, coords: ArrayView2<'_, f64>, ) -> Result<(), String>

Accumulate the full-batch cross-moment Targetᵀ · Coords where targets is (N × p) ambient decoder targets and coords is (N × r) in-span coordinates. fast_atb forms Targetᵀ Coords (p × r) directly.

pub fn moment(&self) -> ArrayView2<'_, f64>

Read the accumulated p × r cross-moment.

pub fn polar_frame(&self) -> Result<GrassmannFrame, String>

Re-polar the frame from the accumulated cross-moment (the streaming closed-form step): U_new = polar(Mcm).

Trait Implementations

impl Clone for GrassmannCrossMoment

fn clone(&self) -> GrassmannCrossMoment

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for GrassmannCrossMoment

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

Formats the value using the given formatter.