hvp_evaluator

Julia

struct HVPEvaluator
HVPEvaluator(fJ!::F, oop::Bool, uj::Vector{Float64}, duj::Vector{Float64}, umap::Vector{Int64}, p_default::P, items::Vector{NTuple{4, Int64}}, rc::Vector{Tuple{Int64, Int64}}, rcidx::Vector{Int64}, M::Vector{Float64}, entries::Vector{JacEntry2}, rownames::Vector{String}, colnames::Vector{String}, col2names::Vector{String}, columns::Union{Nothing, Vector{Tuple{String, Vector{Int64}}}}, structure::Union{Nothing, Symbol}, wrt::Tuple{Symbol, Symbol}) where {F, P}

HVPEvaluator

Prepared second-order contraction for one axis pair: call hvp! (g, hv, pairs, u, p, t). Fields of note: entries, rownames (μ’s index space, the states), colnames (w’s: the states, or ["t"] on a time pair), col2names (g’s: the second axis, in its canonical order), columns (the second axis’s column space on :parameters / :forcing), wrt.

Source

Python

class HVPEvaluator
HVPEvaluator(sv: SysView, wrt, forcing=None)

A prepared second-order contraction for one axis pair, built once by prepare_hvp : the second-order bands (jacobian_bands2 ) and every band point’s (row, column, second column) placement. Each hvp call only resolves the coefficients at the point — the Julia reference’s HVPEvaluator in this binding’s correctness-surface form.

Fields of note: wrt (the pair), entries, structure, columns (the second axis’s jacobian_columns space on "parameters" / "forcing", else None), col2names (that space’s cell names, else None) and colnames (["t"] on a time pair, else None).

Source

Rust

pub struct HvpEvaluator {
    pub wrt: (Wrt, Wrt),
    pub entries: Vec<JacEntry2>,
    pub columns: Option<Vec<(String, Vec<i64>)>>,
    pub colnames: Vec<String>,
    pub structure: Option<&'static str>,
    /* private fields */
}

impl HvpEvaluator { pub fn hvp(&self, env: &Env, pairs: &[HvpPair], form: HvpForm, g: &mut BTreeMap<String, f64>) -> Result<(), BandError> }

A prepared second-order contraction for one axis pair, built once by [prepare_hvp]: the second-order bands, their observed-inlined coefficients, the second axis’s column space and the parameter defaults. Each HvpEvaluator::hvp only walks the band points at the given Env.

Source · Rust docs