Struct CrowdlessNsga2 

pub struct CrowdlessNsga2 { /* private fields */ }

NSGA-II with crowding distance deleted: the diversity ablation.

See the module documentation for exactly which single piece differs from Nsga2.

Implementations

impl CrowdlessNsga2

pub fn with_population_size(population_size: usize) -> Result<Self>

An ablation with an explicit population size, matching the real sampler’s bounds so a paired comparison can always be configured.

Errors

Error::InvalidSpace outside MIN_POPULATION_SIZE ..= MAX_POPULATION_SIZE.

pub const fn population_size(&self) -> usize

How many children make one generation.

pub fn generation(&self) -> u64

How many generations have closed.

0 if the state lock is poisoned — an inspection accessor, not a decision path.

Trait Implementations

impl Debug for CrowdlessNsga2

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

Formats the value using the given formatter.

impl Sampler for CrowdlessNsga2

fn infer_relative_space(&self, study: &StudyView) -> Result<SpaceSchema>

The study’s declared space, verbatim — as Nsga2.

Errors

Never.

fn sample_relative( &self, study: &StudyView, trial: &TrialMeta, space: &SpaceSchema, ) -> Result<Assignment>

Breeds one child, exactly as the real sampler does but with a crowding distance of zero everywhere.

Errors

Error::InvalidSpace if a declared distribution is malformed; Error::Sampler if the state lock is poisoned.

fn sample_independent( &self, _study: &StudyView, trial: &TrialMeta, name: &str, dist: &Distribution, ) -> Result<ParamValue>

The uniform draw for a parameter the relative space did not cover.

Errors

Error::InvalidSpace if dist is malformed.

fn after_trial(&self, study: &StudyView, trial: &FrozenTrial) -> Result<()>

Admits the finished trial and, once a generation is full, runs survival.

Errors

Never — a failure here must not fail the trial.

fn state(&self) -> Result<Option<SamplerState>>

A bench fixture keeps no persisted state.

Errors

Never.

fn reseed(&self, _seed: u64)

A no-op, as the real sampler’s: the randomness is keyed on the trial’s sampler seed.

fn snapshots_space(&self) -> bool

Whether this sampler enumerates a snapshot of the space it was constructed with, rather than the space each ask presents.

fn restore_state(&self, blob: &StateBlob) -> Result<(), Error>

Restores a sampler from a previously persisted blob.