Struct NopScheduler 

pub struct NopScheduler;

Lets every trial run to completion.

The degenerate scheduler: it answers Decision::Continue to every report, keeps no state, and persists nothing. It exists so that the study loop has exactly one code path — a study always has a scheduler, and “no pruning” is expressed as a scheduler rather than as an Option and a branch at every call site.

This is what a study runs by default. Choosing it is a statement: no trial is ever stopped early, so a multi-fidelity budget is spent in full on every configuration.

The real schedulers — median stopping, ASHA, Hyperband, and the pause/fork-capable PBT family — live beside it. They are what Decision::Pause and Decision::Fork were declared for; NopScheduler never produces either.

use atune_core::id::{StudyId, TrialId, TrialNumber};
use atune_core::scheduler::{Decision, NopScheduler, Scheduler};
use atune_core::study::StudyView;
use atune_core::trial::TrialMeta;

let scheduler = NopScheduler::new();
let view = StudyView::new(StudyId::new(0), vec![], None);
let trial = TrialMeta::new_with_study_seed(TrialId::new(1), TrialNumber::new(0), 0);

assert_eq!(
    scheduler.on_report(&view, &trial, 10, &[0.5]).unwrap(),
    Decision::Continue
);

Implementations

impl NopScheduler

pub const fn new() -> Self

Creates the scheduler.

Trait Implementations

impl Clone for NopScheduler

fn clone(&self) -> NopScheduler

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for NopScheduler

impl Debug for NopScheduler

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

Formats the value using the given formatter.

impl Default for NopScheduler

fn default() -> NopScheduler

Returns the “default value” for a type.

impl Eq for NopScheduler

impl PartialEq for NopScheduler

fn eq(&self, other: &NopScheduler) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl Scheduler for NopScheduler

fn on_report( &self, _study: &StudyView, _trial: &TrialMeta, _step: u64, _values: &[f64], ) -> Result<Decision>

Always Decision::Continue, whatever was reported.

Errors

Never.

fn scripted_capability(&self) -> ScriptedSchedulerCapability

Declares whether scripted ask/tell can recreate this scheduler.

fn fan_report_mode(&self) -> FanReportMode

Declares whether this scheduler accepts aligned aggregate fan reports.

fn population_report_mode(&self) -> PopulationReportMode

Declares whether this scheduler accepts one shared report batch from several population members. This is distinct from fanned replicate reports. The default is fail-closed.

fn on_population_report( &self, study: &StudyView, reports: &[PopulationReport], ) -> Result<Vec<PopulationDecision>>

Decides all members at one population boundary from the same snapshot.

fn on_trial_end( &self, study: &StudyView, trial: &FrozenTrial, ) -> Result<Vec<Command>>

Called once a trial reaches a terminal state.

fn resume_candidates(&self, study: &StudyView) -> Result<Vec<Command>>

Paused trials worth waking on a freed work slot, in priority order.

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

The scheduler’s persistable state, if it has any.

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

Restores a scheduler from a previously persisted blob.

impl StructuralPartialEq for NopScheduler