Struct DeState 

pub struct DeState<B: Backend> {
    pub population: Tensor<B, 2>,
    pub fitness: Vec<f32>,
    pub best_index: usize,
    pub best_genome: Option<Tensor<B, 2>>,
    pub best_fitness: f32,
    pub generation: usize,
}

Generation state for DifferentialEvolution.

The two-phase ask/tell handshake uses fitness.is_empty() as a sentinel: on the very first Strategy::ask call the initial population is returned unchanged; on the very first Strategy::tell call fitness is populated and best_genome/best_fitness are initialized. Subsequent ask/tell cycles produce and evaluate trial vectors.

Fields

population: Tensor<B, 2>

Current population, shape (pop_size, D).

fitness: Vec<f32>

Host-side fitness cache for the current population.

Empty before the first Strategy::tell call; length pop_size thereafter. The is_empty() check is the sentinel that distinguishes the initial evaluation phase from subsequent trial-vector generations.

best_index: usize

Index of the current best individual within population.

best_genome: Option<Tensor<B, 2>>

Best-so-far genome, shape (1, D).

None before the first Strategy::tell call.

best_fitness: f32

Best-so-far fitness across all completed generations.

f32::NEG_INFINITY before the first Strategy::tell call (the worst value under the maximise convention).

generation: usize

Number of completed tell calls (zero-based generation index + 1).

Trait Implementations

impl<B: Clone + Backend> Clone for DeState<B>

fn clone(&self) -> DeState<B>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<B: Debug + Backend> Debug for DeState<B>

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

Formats the value using the given formatter.