Struct CompositeObjective 

pub struct CompositeObjective {
    pub terms: Vec<(String, f64)>,
    pub direction: Direction,
    pub scalarizer: Scalarizer,
}

A scalar objective composed from several named metrics.

The composite is the single value the optimizer sees; the component metrics stay recorded on each trial, so a Pareto/multi-objective layer can be added later without schema migration.

Fields

terms: Vec<(String, f64)>

(metric_name, weight) pairs. Negative weights penalize.

direction: Direction

Direction of the composite value. Overrides any per-objective direction: see Study::primary_direction.

scalarizer: Scalarizer

How the weighted terms collapse into one scalar. Defaults to Scalarizer::WeightedSum; absent in pre-scalarizer JSON, hence serde(default).

Implementations

impl CompositeObjective

pub fn evaluate(&self, trial: &Trial) -> Option<f64>

Evaluate over a trial’s final (last-recorded) metric values. None if any term’s metric is missing.

Trait Implementations

impl Clone for CompositeObjective

fn clone(&self) -> CompositeObjective

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CompositeObjective

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for CompositeObjective

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for CompositeObjective

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

where __S: Serializer,

Serialize this value into the given Serde serializer.