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JacobiPreconditioner

gam_solve::arrow_schur

Struct JacobiPreconditioner 

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pub struct JacobiPreconditioner { /* private fields */ }
Expand description

Block-Jacobi Schur preconditioner for BA’s inexact reduced-system PCG.

When ArrowSchurSystem::block_offsets is populated (via ArrowSchurSystem::set_block_offsets) and the largest block has ≤ 256 columns, builds one small dense Schur block per term, factors it with Cholesky (faer LLT), and applies the preconditioner as per-block triangular solves. Non-PD blocks fall back to scalar diagonal inversion for that block only. When block_offsets is empty or the largest block exceeds 256 columns the preconditioner reduces to pure scalar-diagonal Jacobi (pre-#283 behaviour), so callers that have not called set_block_offsets are unaffected.

The block_offsets plumbing is compatible with issue #287 (custom ParameterBlockSpec families): those callers supply ranges derived from their own block layout.

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impl Clone for JacobiPreconditioner

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fn clone(&self) -> JacobiPreconditioner

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 Debug for JacobiPreconditioner

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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<T> Allocation for T
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impl<T> ByRef<T> for T

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. Read more
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fn from(t: T) -> T

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Calls U::from(self).

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Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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type Init = T

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unsafe fn init(init: <T as Pointable>::Init) -> usize

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type Output = T

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fn to_subset(&self) -> Option<SS>

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fn is_in_subset(&self) -> bool

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fn to_subset_unchecked(&self) -> SS

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fn vzip(self) -> V