genetic_algorithm 0.27.1

A genetic algorithm implementation
Documentation 
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#[cfg(test)]
use crate::support::*;
use genetic_algorithm::extension::{Extension, ExtensionMassDeduplication};
use genetic_algorithm::genotype::{BinaryGenotype, Genotype};
use genetic_algorithm::population::Population;
use genetic_algorithm::strategy::evolve::{EvolveConfig, EvolveState};
use genetic_algorithm::strategy::StrategyReporterNoop;

#[test]
fn standard() {
    let mut genotype = BinaryGenotype::builder()
        .with_genes_size(3)
        .with_genes_hashing(true)
        .build()
        .unwrap();

    let mut population: Population<bool> = build::population(vec![
        vec![false, true, true],
        vec![false, true, true],
        vec![false, true, true],
        vec![true, false, true],
        vec![true, false, true],
        vec![true, false, true],
        vec![true, true, true],
        vec![true, true, true],
    ]);
    population.chromosomes.reserve_exact(2);
    assert_eq!(population.chromosomes.capacity(), 10);

    let mut state = EvolveState::new(&genotype);
    state.population_cardinality = population.genes_cardinality();
    state.population = population;
    let config = EvolveConfig {
        target_population_size: 0,
        ..Default::default()
    };
    let mut reporter = StrategyReporterNoop::new();
    let mut rng = SmallRng::seed_from_u64(0);
    ExtensionMassDeduplication::new(3).after_selection_complete(
        &mut genotype,
        &mut state,
        &config,
        &mut reporter,
        &mut rng,
    );

    state.population.chromosomes.sort_by_key(|c| c.genes_hash());
    assert_eq!(
        inspect::population(&state.population),
        vec![
            vec![true, true, true],
            vec![true, false, true],
            vec![false, true, true],
        ]
    );
    assert_eq!(state.population.chromosomes.capacity(), 10);
}

#[test]
fn never_leaves_less_than_two() {
    let mut genotype = BinaryGenotype::builder()
        .with_genes_size(3)
        .with_genes_hashing(true)
        .build()
        .unwrap();

    let mut population: Population<bool> = build::population(vec![
        vec![true, true, true],
        vec![true, true, true],
        vec![true, true, true],
        vec![true, true, true],
        vec![true, true, true],
        vec![true, true, true],
        vec![true, true, true],
        vec![true, true, true],
    ]);
    population.chromosomes.reserve_exact(2);
    assert_eq!(population.chromosomes.capacity(), 10);

    let mut state = EvolveState::new(&genotype);
    state.population_cardinality = population.genes_cardinality();
    state.population = population;
    let config = EvolveConfig {
        target_population_size: 0,
        ..Default::default()
    };
    let mut reporter = StrategyReporterNoop::new();
    let mut rng = SmallRng::seed_from_u64(0);
    ExtensionMassDeduplication::new(1).after_selection_complete(
        &mut genotype,
        &mut state,
        &config,
        &mut reporter,
        &mut rng,
    );

    assert_eq!(
        inspect::population(&state.population),
        vec![vec![true, true, true], vec![true, true, true]]
    );
    assert_eq!(state.population.chromosomes.capacity(), 10);
}

#[test]
fn skips_execution_if_no_genes_hash() {
    let mut genotype = BinaryGenotype::builder()
        .with_genes_size(3)
        .with_genes_hashing(false)
        .build()
        .unwrap();

    let mut population: Population<bool> = build::population_without_genes_hash(vec![
        vec![false, true, true],
        vec![false, true, true],
        vec![false, true, true],
        vec![true, false, true],
        vec![true, false, true],
        vec![true, false, true],
        vec![true, true, true],
        vec![true, true, true],
    ]);
    population.chromosomes.reserve_exact(2);
    assert_eq!(population.chromosomes.capacity(), 10);

    let mut state = EvolveState::new(&genotype);
    assert_eq!(population.genes_cardinality(), None);
    state.population_cardinality = Some(2); // hard trigger, because no cardinality if no genes hashes
    state.population = population;
    let config = EvolveConfig {
        target_population_size: 0,
        ..Default::default()
    };
    let mut reporter = StrategyReporterNoop::new();
    let mut rng = SmallRng::seed_from_u64(0);
    ExtensionMassDeduplication::new(3).after_selection_complete(
        &mut genotype,
        &mut state,
        &config,
        &mut reporter,
        &mut rng,
    );

    state.population.chromosomes.sort_by_key(|c| c.genes_hash());
    assert_eq!(
        inspect::population(&state.population),
        vec![
            vec![false, true, true],
            vec![false, true, true],
            vec![false, true, true],
            vec![true, false, true],
            vec![true, false, true],
            vec![true, false, true],
            vec![true, true, true],
            vec![true, true, true],
        ]
    );
    assert_eq!(state.population.chromosomes.capacity(), 10);
}