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use rand::prelude::SliceRandom;
use crate::{
genes::{Activation, Connection, IdGenerator, Node},
genome::Genome,
rng::GenomeRng,
};
use super::Mutations;
impl Mutations {
pub fn add_node(
activation_pool: &[Activation],
genome: &mut Genome,
rng: &mut GenomeRng,
id_gen: &mut IdGenerator,
) {
let mut random_connection = genome.feed_forward.random(rng).cloned().unwrap();
let id = id_gen
.cached_id_iter(random_connection.id())
.find(|&id| {
genome
.hidden
.get(&Node::new(id, Activation::Linear))
.is_none()
})
.unwrap();
let new_node = Node::new(id, activation_pool.choose(rng).cloned().unwrap());
assert!(genome.feed_forward.insert(Connection::new(
random_connection.input,
1.0,
new_node.id,
)));
assert!(genome.feed_forward.insert(Connection::new(
new_node.id,
random_connection.weight,
random_connection.output,
)));
assert!(genome.hidden.insert(new_node));
random_connection.weight = 0.0;
genome.feed_forward.replace(random_connection);
}
}
#[cfg(test)]
mod tests {
use crate::GenomeContext;
#[test]
fn add_random_node() {
let mut gc = GenomeContext::default();
let mut genome = gc.initialized_genome();
genome.add_node_with_context(&mut gc);
assert_eq!(genome.feed_forward.len(), 3);
}
}