Struct evco::gp::tree::TreeGen

pub struct TreeGen<'a, R> where
    R: 'a + Rng,  { /* fields omitted */ }

Configures depth and properties of GP trees.

Methods

impl<'a, R> TreeGen<'a, R> where
    R: 'a + Rng, 

fn perfect(rng: &mut R, min_depth: usize, max_depth: usize) -> TreeGen<R>

Generate perfect trees. All leaves are at the same depth in the range [min_depth, max_depth].

This is the equivalent of DEAP's genFull.

fn full(rng: &mut R, min_depth: usize, max_depth: usize) -> TreeGen<R>

Generate full trees with leaves at varying depths. Leaf depths are linearly distributed between min_depth and a chosen depth in the range.

This is NOT the same as DEAP's genFull. See TreeGen::perfect.

fn full_ranged(rng: &mut R, min_depth: usize, max_depth: usize) -> TreeGen<R>

Generate full trees with leaves at varying depths. Leaf depths are linearly distributed between min_depth and a chosen depth in the range.

This is the equivalent of DEAP's genGrow.

fn half_and_half(rng: &mut R, min_depth: usize, max_depth: usize) -> TreeGen<R>

Randomly choose between TreeGen::perfect and TreeGen::full_ranged.

This is the equivalent of DEAP's genHalfAndHalf.

fn have_reached_a_leaf(&mut self, current_depth: usize) -> bool

Chooses whether to generate a Leaf node. Used by Tree::child.

Trait Implementations

impl<'a, R: PartialEq> PartialEq for TreeGen<'a, R> where
    R: 'a + Rng, 

fn eq(&self, __arg_0: &TreeGen<'a, R>) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, __arg_0: &TreeGen<'a, R>) -> bool

This method tests for !=.

impl<'a, R: Eq> Eq for TreeGen<'a, R> where
    R: 'a + Rng, 

impl<'a, R: Debug> Debug for TreeGen<'a, R> where
    R: 'a + Rng, 

fn fmt(&self, __arg_0: &mut Formatter) -> Result

Formats the value using the given formatter.

impl<'a, R> Rng for TreeGen<'a, R> where
    R: 'a + Rng, 

fn next_u32(&mut self) -> u32

Return the next random u32.

fn next_u64(&mut self) -> u64

Return the next random u64.

fn fill_bytes(&mut self, dest: &mut [u8])

Fill dest with random data.

fn next_f32(&mut self) -> f32

Return the next random f32 selected from the half-open interval [0, 1).

fn next_f64(&mut self) -> f64

Return the next random f64 selected from the half-open interval [0, 1).

fn gen<T>(&mut self) -> T where
    T: Rand, 

Return a random value of a Rand type.

fn gen_iter<T>(&'a mut self) -> Generator<'a, T, Self> where
    T: Rand, 

Return an iterator that will yield an infinite number of randomly generated items.

fn gen_range<T>(&mut self, low: T, high: T) -> T where
    T: SampleRange + PartialOrd<T>, 

Generate a random value in the range [low, high).

fn gen_weighted_bool(&mut self, n: u32) -> bool

Return a bool with a 1 in n chance of true

fn gen_ascii_chars(&'a mut self) -> AsciiGenerator<'a, Self>

Return an iterator of random characters from the set A-Z,a-z,0-9.

fn choose<T>(&mut self, values: &'a [T]) -> Option<&'a T>

Return a random element from values.

fn choose_mut<T>(&mut self, values: &'a mut [T]) -> Option<&'a mut T>

Return a mutable pointer to a random element from values.

fn shuffle<T>(&mut self, values: &mut [T])

Shuffle a mutable slice in place.