Struct ConstantCurvatureBasisSpec 

pub struct ConstantCurvatureBasisSpec {
    pub center_strategy: CenterStrategy,
    pub kappa: f64,
    pub length_scale: f64,
    pub double_penalty: bool,
    pub identifiability: ConstantCurvatureIdentifiability,
}

Constant-curvature smooth configuration (curv(x, z, kappa = …)).

The chart inputs are the raw feature columns interpreted as κ-stereographic chart coordinates: any finite point for κ ≥ 0, the open ball ‖x‖ < 1/√(−κ) for κ < 0. The default κ = 0 reproduces a Euclidean exponential-kernel smooth (in the doubled κ = 0 chart gauge), so the term is safe to use as a drop-in flat smooth until κ becomes a fitted ψ-coordinate.

Fields

center_strategy: CenterStrategy

Center/knot selection strategy in chart coordinates. Deliberately κ-independent (see the module-level κ-contract).

kappa: f64

Sectional curvature κ of the latent/feature geometry. Fixed at build time; the later ψ-channel stage promotes it to a fitted outer coordinate consuming this module’s exact κ-jets.

length_scale: f64

Geodesic kernel range ℓ in K_κ = exp(−d_κ/ℓ). The 0.0 sentinel requests the κ-independent auto initialization (realized_constant_curvature_length_scale); the realized value is persisted in BasisMetadata::ConstantCurvature and frozen back into the spec for predict-time replay.

double_penalty: bool

Add the ridge-like shrinkage penalty alongside the RKHS Gram penalty.

identifiability: ConstantCurvatureIdentifiability

Realized-design identifiability policy (see type docs).

Trait Implementations

impl Clone for ConstantCurvatureBasisSpec

fn clone(&self) -> ConstantCurvatureBasisSpec

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ConstantCurvatureBasisSpec

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

Formats the value using the given formatter.

impl Default for ConstantCurvatureBasisSpec

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for ConstantCurvatureBasisSpec

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for ConstantCurvatureBasisSpec

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.