Struct TransformSpec 

pub struct TransformSpec {
    pub constraint: ConstraintType,
}

Per-parameter transform specification: constraint type + bijective map.

A TransformSpec pairs a ConstraintType with the forward/inverse transform functions and log-Jacobian for use inside ADVI.

Fields

constraint: ConstraintType

The constraint type for this parameter

Implementations

impl TransformSpec

pub fn new(constraint: ConstraintType) -> Self

Create a TransformSpec from a ConstraintType.

pub fn unconstrained() -> Self

Create an unconstrained (identity) spec.

pub fn positive() -> Self

Create a positive-valued spec (log transform).

pub fn bounded(lo: f64, hi: f64) -> Self

Create a bounded spec for θ ∈ (lo, hi).

pub fn to_unconstrained(&self, theta: f64) -> StatsResult<f64>

Forward transform: constrained θ → unconstrained η.

Returns an error if the value violates the constraint.

pub fn to_constrained(&self, eta: f64) -> f64

Inverse transform: unconstrained η → constrained θ.

pub fn log_jacobian_inverse(&self, eta: f64) -> f64

Log-absolute-Jacobian of the inverse transform (η → θ), i.e., log|dθ/dη|. Added to log p(θ) when computing the ELBO.

Trait Implementations

impl Clone for TransformSpec

fn clone(&self) -> TransformSpec

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TransformSpec

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

Formats the value using the given formatter.

impl PartialEq for TransformSpec

fn eq(&self, other: &TransformSpec) -> 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 TransformSpec