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ArrowSolvePrecisionPolicy

gam_solve::arrow_schur

Enum ArrowSolvePrecisionPolicy 

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pub enum ArrowSolvePrecisionPolicy {
    F64Only,
    CertifiedMixed {
        max_refinement_steps: usize,
        residual_relative_tolerance: f64,
        kappa_unit_roundoff_margin: f64,
    },
}
Expand description

Opt-in Carson–Higham mixed-precision refinement for dense arrow solves.

Default is ArrowSolvePrecisionPolicy::F64Only: exact f64 solves remain the default. ArrowSolvePrecisionPolicy::CertifiedMixed stores f32 copies of the per-row Cholesky factors and dense Schur factor, solves corrections in f32, and recomputes the residual in f64 against the original arrow blocks. The standard refinement certificate is the normwise backward error

||r||_inf / (||H||_inf ||x||_inf + ||b||_inf) <= residual_relative_tolerance.

The kappa gate enforces kappa_estimate * u_f32 < kappa_unit_roundoff_margin; when it fails, the solve reports MixedPrecisionStatus::F64Fallback and logs the reason before using the f64 path.

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F64Only

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CertifiedMixed

Fields

§max_refinement_steps: usize
§residual_relative_tolerance: f64
§kappa_unit_roundoff_margin: f64

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Trait Implementations§

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impl Clone for ArrowSolvePrecisionPolicy

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fn clone(&self) -> ArrowSolvePrecisionPolicy

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

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

Performs copy-assignment from source. Read more
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impl Copy for ArrowSolvePrecisionPolicy

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impl Debug for ArrowSolvePrecisionPolicy

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

Formats the value using the given formatter. Read more
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impl Default for ArrowSolvePrecisionPolicy

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl PartialEq for ArrowSolvePrecisionPolicy

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

Tests for self and other values to be equal, and is used by ==.
1.0.0 (const: unstable) · Source§

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

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

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