Struct SparseXtwxPrecomputed 

pub struct SparseXtwxPrecomputed {
    pub xtwx_symbolic_col_ptr: Vec<usize>,
    pub xtwx_symbolic_row_idx: Vec<usize>,
    pub xtwxvalues: Vec<f64>,
}

Precomputed numerical values of XᵀWX aligned with the symbolic pattern that SparseXtWxCache::new(x) produces on its first call. Two such caches built from the same sparse x produce byte-identical symbolic patterns (faer’s sparse_sparse_matmul_symbolic is deterministic), so the cached values can be installed back into a fresh SparseXtWxCache for the same x without rerunning the SpGEMM.

We snapshot the symbolic pattern (col_ptr / row_idx) alongside the values so the consumer can verify pattern equivalence and fall through to the per-call recomputation if anything diverges (e.g. an x with a different symbolic shape sneaks in).

Fields

xtwx_symbolic_col_ptr: Vec<usize>

xtwx_symbolic_row_idx: Vec<usize>

xtwxvalues: Vec<f64>

Implementations

impl SparseXtwxPrecomputed

pub fn build( x: &SparseColMat<usize, f64>, weights: &Array1<f64>, ) -> Result<Self, EstimationError>

Build the precomputed XᵀWX value layout for x at the given weights. The output reuses the same construction path the inner PIRLS workspace uses, so it lands in exactly the symbolic pattern the consumer expects.

Trait Implementations

impl Clone for SparseXtwxPrecomputed

fn clone(&self) -> SparseXtwxPrecomputed

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SparseXtwxPrecomputed

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

Formats the value using the given formatter.