Struct SubtreeMutation 

pub struct SubtreeMutation {
    pub max_subtree_depth: usize,
    pub function_probability: f64,
    pub terminal_probability: f64,
}

Subtree mutation for tree genomes (genetic programming)

Replaces a randomly selected subtree with a new randomly generated subtree. This is a more disruptive mutation than point mutation.

Fields

max_subtree_depth: usize

Maximum depth of the generated subtree

function_probability: f64

Probability of selecting a function node for replacement

terminal_probability: f64

Terminal probability for grow method

Implementations

impl SubtreeMutation

pub fn new() -> Self

Create a new subtree mutation with default settings

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

Set the maximum depth for generated subtrees

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

Set the function selection probability

pub fn with_terminal_probability(self, probability: f64) -> Self

Set the terminal probability for tree generation

Trait Implementations

impl Clone for SubtreeMutation

fn clone(&self) -> SubtreeMutation

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SubtreeMutation

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

Formats the value using the given formatter.

impl Default for SubtreeMutation

fn default() -> Self

Returns the “default value” for a type.

impl<T: Terminal, F: Function> MutationOperator<TreeGenome<T, F>> for SubtreeMutation

fn mutate<R: Rng>(&self, genome: &mut TreeGenome<T, F>, rng: &mut R)

Apply mutation to a genome in place

fn mutation_probability(&self) -> f64

Get the mutation probability per gene