Struct MedianPruner 

pub struct MedianPruner { /* private fields */ }

Prunes a trial when its latest intermediate value is worse than the median of other trials’ values at the same step.

Mirrors Optuna’s MedianPruner:

• No pruning until at least n_startup_trials trials have completed (so the median is meaningful).
• No pruning before n_warmup_steps steps have elapsed within a trial (give every trial a chance to get past a noisy start).
• At the current step, compare against the median of the values reported at that same step by trials that reached it; prune if strictly worse.

Implementations

impl MedianPruner

pub fn new() -> MedianPruner

A median pruner with default gates (n_startup_trials = 5, n_warmup_steps = 0, min_trials_at_step = 1).

pub fn n_startup_trials(self, n: usize) -> MedianPruner

Number of completed trials required before any pruning happens.

pub fn n_warmup_steps(self, n: usize) -> MedianPruner

Number of steps a trial must run before it becomes eligible for pruning.

pub fn min_trials_at_step(self, n: usize) -> MedianPruner

Minimum number of comparison values required at a step before the median is trusted enough to prune against.

Trait Implementations

impl Clone for MedianPruner

fn clone(&self) -> MedianPruner

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for MedianPruner

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

Formats the value using the given formatter.

impl Default for MedianPruner

fn default() -> MedianPruner

Returns the “default value” for a type.

impl Pruner for MedianPruner

fn should_prune(&self, study_state: &StudyState, trial: &Trial) -> bool