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Fitness

fugue_evo::fitness::traits

Trait Fitness 

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pub trait Fitness: Send + Sync {
    type Genome: EvolutionaryGenome;
    type Value: FitnessValue;

    // Required method
    fn evaluate(&self, genome: &Self::Genome) -> Self::Value;

    // Provided methods
    fn as_log_likelihood(&self, genome: &Self::Genome, temperature: f64) -> f64 { ... }
    fn gradient(&self, _genome: &Self::Genome) -> Option<Vec<f64>> { ... }
}
Expand description

Fitness evaluation trait

Defines how to evaluate the fitness of a genome.

Required Associated Types§

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type Genome: EvolutionaryGenome

The genome type being evaluated

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type Value: FitnessValue

The fitness value type

Required Methods§

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fn evaluate(&self, genome: &Self::Genome) -> Self::Value

Evaluate fitness (higher = better by convention)

Provided Methods§

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fn as_log_likelihood(&self, genome: &Self::Genome, temperature: f64) -> f64

Convert fitness to log-likelihood for probabilistic selection

Uses Boltzmann distribution: P(x) ∝ exp(f(x) / T)

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fn gradient(&self, _genome: &Self::Genome) -> Option<Vec<f64>>

Optional: Provide gradient for gradient-assisted mutation

Implementors§