Struct Trial 

pub struct Trial {
    pub number: usize,
    pub params: Vec<ParamRecord>,
    pub intermediate_values: Vec<(usize, f64)>,
    pub value: Option<f64>,
    pub state: TrialState,
}

A single optimization trial: its suggested parameters, intermediate reports, and final objective value.

params is kept in suggestion order (an ordered list rather than a hash map) so that define-by-run search spaces — where the set of parameters can differ between trials — round-trip faithfully through storage and are reproducible for grid enumeration.

Fields

number: usize

Zero-based trial index within its study.

params: Vec<ParamRecord>

Parameters suggested so far, in the order they were requested.

intermediate_values: Vec<(usize, f64)>

Intermediate (step, value) reports, populated via crate::TrialContext::report; consumed by pruners.

value: Option<f64>

Final objective value, once the trial completes.

state: TrialState

Current lifecycle state.

Implementations

impl Trial

pub fn new(number: usize) -> Trial

Creates a fresh Running trial with the given number and no params.

pub fn record(&mut self, name: &str, distribution: Distribution, value: Value)

Records a suggested parameter. Re-suggesting the same name overwrites the previous record (mirrors Optuna, where repeated suggest_* calls for one name within a trial are idempotent).

pub fn param_value(&self, name: &str) -> Option<&Value>

Looks up a previously recorded parameter value by name.

pub fn value_at_step(&self, step: usize) -> Option<f64>

The intermediate value reported at exactly step, if any.

pub fn value_at_or_after(&self, step: usize) -> Option<f64>

The intermediate value at the smallest reported step >= step, if any. Used by rung-based pruners that compare trials at a resource budget.

pub fn last_intermediate(&self) -> Option<(usize, f64)>

The most recent (step, value) report, if the trial has reported.

Trait Implementations

impl Clone for Trial

fn clone(&self) -> Trial

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Trial

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Trial

fn deserialize<__D>( __deserializer: __D, ) -> Result<Trial, <__D as Deserializer<'de>>::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for Trial

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for Trial

fn serialize<__S>( &self, __serializer: __S, ) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Trial