Struct PointMutation 

pub struct PointMutation {
    pub mutation_probability: f64,
    pub function_probability: f64,
}

Point mutation for tree genomes (genetic programming)

Selects a random node and replaces it with a new random node of the same type. For function nodes, the replacement has the same arity. For terminal nodes, another random terminal is selected.

This is a non-destructive mutation that preserves tree structure while changing individual nodes.

Fields

mutation_probability: f64

Per-node mutation probability

function_probability: f64

Probability of selecting a function node (vs terminal)

Implementations

impl PointMutation

pub fn new() -> Self

Create a new point mutation with default settings

Defaults: 0.1 per-node probability, 0.9 function probability

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

Set the per-node mutation probability

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

Set the function selection probability

Trait Implementations

impl Clone for PointMutation

fn clone(&self) -> PointMutation

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PointMutation

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

Formats the value using the given formatter.

impl Default for PointMutation

fn default() -> Self

Returns the “default value” for a type.

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

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