Struct SharedSiteCrossover 

pub struct SharedSiteCrossover {
    pub n_pairs: usize,
    pub swap_probability: f64,
}

Structure-safe crossover population kernel: fugue’s [fugue::CrossoverKernel] move (pick two distinct particles, exchange the block of choices at a masked address set, accept the pair with the product-target Metropolis ratio) with the mask of shared_site_crossover_mask and a completeness-checked re-score (fugue’s reconciling scorer plus its fresh/vanished report) in place of fugue’s panicking one.

A proposal is rejected outright when either child fails to re-score as a complete execution over its own pre-swap address set — the model visited an address the child does not hold (a structural site whose new value opened a branch), or left some of the child’s choices unvisited (a branch closed). Every accepted pair therefore has exactly the parents’ address sets, so the swap is an involution on the state space and the mask distribution is the same in both directions: the move is symmetric and leaves the product of tempered targets invariant; the rejected proposals are self-loops, which detailed balance ignores. This is what EvoSmcConfig::crossover builds, so EvolutionSMC::run / anneal with EvoSmcConfig::default() are safe on any GenomePrior.

Fields

n_pairs: usize

Number of (pair, swap) proposals per sweep.

swap_probability: f64

Per-address probability that a shared site joins the swap mask.

Trait Implementations

impl Clone for SharedSiteCrossover

fn clone(&self) -> SharedSiteCrossover

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SharedSiteCrossover

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

Formats the value using the given formatter.

impl From<&CrossoverConfig> for SharedSiteCrossover

fn from(cfg: &CrossoverConfig) -> Self

Converts to this type from the input type.

impl<A> PopulationKernel<A> for SharedSiteCrossover

fn sweep( &mut self, rng: &mut dyn RngCore, particles: &mut [Particle], model_fn: &dyn Fn() -> Model<A>, beta: f64, )

Apply one population sweep in place. beta is the current tempering exponent; model_fn reconstructs the single-execution model whose tempered density defines the (product) target.

fn is_identity(&self) -> bool

true iff sweep is a no-op, so the driver may skip the tempering ladder entirely when there is also no per-particle rejuvenation (the FG-43 single-reweight shortcut). Defaults to false; only [NoKernel] overrides it. A kernel that moves particles must not return true: with rejuvenation_steps == 0 the shortcut would otherwise silently skip it (FG-N3).