Struct SubtreeCrossover 

pub struct SubtreeCrossover {
    pub max_depth: Option<usize>,
    pub function_probability: f64,
}

Subtree Crossover for genetic programming

Selects random subtrees from two parent trees and swaps them to create offspring. This is the standard crossover operator for GP.

Fields

max_depth: Option<usize>

Maximum depth for offspring trees (to control bloat)

function_probability: f64

Probability of selecting a function node (vs terminal)

Implementations

impl SubtreeCrossover

pub fn new() -> Self

Create a new subtree crossover operator

pub fn with_max_depth(self, max_depth: usize) -> Self

Create with a specific maximum depth limit

pub fn without_depth_limit(self) -> Self

Create with no depth limit

pub fn with_function_probability(self, prob: f64) -> Self

Set the probability of selecting a function node

Trait Implementations

impl Clone for SubtreeCrossover

fn clone(&self) -> SubtreeCrossover

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T: Terminal, F: Function> CrossoverOperator<TreeGenome<T, F>> for SubtreeCrossover

fn crossover<R: Rng>( &self, parent1: &TreeGenome<T, F>, parent2: &TreeGenome<T, F>, rng: &mut R, ) -> OperatorResult<(TreeGenome<T, F>, TreeGenome<T, F>)>

Apply crossover to two parents and produce two offspring

fn crossover_probability(&self) -> f64

Get the probability of crossover being applied

impl Debug for SubtreeCrossover

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

Formats the value using the given formatter.

impl Default for SubtreeCrossover

fn default() -> Self

Returns the “default value” for a type.