Enum HessianValue 

pub enum HessianValue {
    Dense(ArrayBase<OwnedRepr<f64>, Dim<[usize; 2]>>),
    Operator(Arc<dyn HessianOperator>),
    Unavailable,
}

Exact Hessian payload used by operator-aware optimizers and objective contracts.

Variants

Dense(ArrayBase<OwnedRepr<f64>, Dim<[usize; 2]>>)

An explicit dense Hessian.

Operator(Arc<dyn HessianOperator>)

An exact Hessian-vector operator. The StdArc wrapping makes the operator cheap to clone and share between callers (e.g. a caller-side cache and the solver).

Unavailable

No analytic Hessian for this evaluation. Whether this is fatal or triggers finite-difference estimation depends on the solver’s HessianFallbackPolicy.

Implementations

impl HessianValue

pub fn is_analytic(&self) -> bool

Whether this value contains exact analytic curvature.

pub fn dim(&self) -> Option<usize>

Dimension of the represented Hessian, if one is available.

pub fn materialize_dense( &self, ) -> Result<Option<ArrayBase<OwnedRepr<f64>, Dim<[usize; 2]>>>, ObjectiveEvalError>

Materialize exact curvature when present.

Trait Implementations

impl Clone for HessianValue

fn clone(&self) -> HessianValue

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for HessianValue

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

Formats the value using the given formatter.