Struct TermBuildContext 

pub struct TermBuildContext {
    pub identity: TermIdentityKey,
    pub rho_slots: Vec<usize>,
    pub reduced_width: usize,
    pub gauge_t_block: Option<Array2<f64>>,
}

Per-term context for the new (about-to-run) fit. Carries everything the transfer needs to lay ρ out in the new fit’s coordinate system, plus the per-block gauge lift T_b : reduced → raw used to project the parent’s RAW β into this fold’s reduced coordinates, without reaching back into the solver internals.

Fields

identity: TermIdentityKey

Structural identity of this new-fit term.

rho_slots: Vec<usize>

Indices into the new fit’s outer ρ vector that this term’s penalties occupy (after label de-duplication). Empty for an unpenalized term.

reduced_width: usize

Reduced (post-identifiability) width of this term’s block in the NEW fit — i.e. spec.design.ncols(). The cold β for this block is a zero vector of this length.

gauge_t_block: Option<Array2<f64>>

This block’s slice of the NEW fit’s gauge lift T : reduced → raw (shape raw_width × reduced_width, β_raw = T · θ). When present and its raw row count matches the parent term’s raw_beta length, the parent’s RAW β is least-squares projected onto this fold’s reduced subspace via θ = (TᵀT + εI)⁻¹ Tᵀ β_raw_parent. None (or a raw-width mismatch) ⇒ β stays cold for this block.

Trait Implementations

impl Clone for TermBuildContext

fn clone(&self) -> TermBuildContext

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TermBuildContext

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

Formats the value using the given formatter.