Enum HessianSource 

pub enum HessianSource {
    Analytic,
    BfgsApprox,
    EfsFixedPoint,
    HybridEfsFixedPoint,
}

How the Hessian will be obtained for the outer optimizer.

Variants

Analytic

Exact analytic Hessian provided by the objective.

BfgsApprox

No explicit Hessian; BFGS builds a rank-2 approximation from gradient history.

EfsFixedPoint

No explicit Hessian or gradient needed. EFS uses traces and Frobenius norms from the inner solution directly.

HybridEfsFixedPoint

Hybrid EFS + preconditioned gradient for ψ coordinates. EFS traces for ρ coords, trace Gram matrix + gradient for ψ coords.

Trait Implementations

impl Clone for HessianSource

fn clone(&self) -> HessianSource

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for HessianSource

impl Debug for HessianSource

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

Formats the value using the given formatter.

impl Eq for HessianSource

impl PartialEq for HessianSource

fn eq(&self, other: &HessianSource) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for HessianSource