Expand description
The neutral ψ (hyperparameter) design-derivative contract carriers and
operator traits shared by the CustomFamily trait layer (gam-model-api)
and the solver: the per-block ψ-derivative carrier, the matrix-free
CustomFamilyPsiDerivativeOperator trait (+ its dense-materialization
extension), and the joint-Hessian source-preference / materialization-intent
enums.
These carry no dependency on the CustomFamily trait itself, so they live
in the neutral gam-problem crate and are re-exported upward, keeping a
single definition shared across crates.
Structs§
Enums§
- Joint
Hessian Source Preference - Materialization
Intent - What the consumer is going to do with the joint Hessian. This is the intent half of #738’s capability-vs-representation split: the call site states what it needs, and the workspace picks the cheapest representation that serves that need (rather than a single per-workspace preference being applied uniformly regardless of how the result is consumed).
Traits§
- Custom
Family PsiDerivative Operator - Materializable
PsiDerivative Operator - Diagnostic / small-data extension that exposes dense materialization of
\partial X / \partial \psi. Production exact-Hessian code MUST NOT depend on dense second-derivative materialization; second-order paths use the row-chunk and matvec methods onCustomFamilyPsiDerivativeOperator.