Enum SearchStrategy 

pub enum SearchStrategy {
    Grid {
        points_per_dim: usize,
    },
    Random {
        n_trials: usize,
        seed: Option<u64>,
    },
    Bayesian {
        n_trials: usize,
        n_startup: usize,
        seed: Option<u64>,
    },
    Hyperband {
        max_resource: usize,
        reduction_factor: usize,
    },
    MultiObjective {
        n_trials: usize,
        objectives: Vec<Objective>,
    },
}

Search strategy for hyperparameter optimization.

Variants

Grid

Exhaustive grid search.

Fields

points_per_dim: usize

Grid resolution per continuous dimension (categoricals use all their choices), so total trials grow multiplicatively with dimension count.

Random

Random sampling.

Fields

n_trials: usize

Number of configurations to sample.

seed: Option<u64>

RNG seed for reproducible sampling; None derives one.

Bayesian

Bayesian optimization (TPE).

Fields

n_trials: usize

Total number of trials, startup included.

n_startup: usize

Trials sampled randomly before the TPE model takes over (it needs history to split good from bad).

seed: Option<u64>

RNG seed for reproducible sampling; None derives one.

Hyperband

Successive halving with early stopping. Declared for forward compatibility: no sampler implements it yet, and Python’s Study.run rejects it as unsupported.

Fields

max_resource: usize

Budget (e.g. epochs) a surviving trial may consume.

reduction_factor: usize

Fraction of trials kept per halving round (3 keeps one in three).

MultiObjective

Multi-objective optimization. Declared for forward compatibility: no sampler implements it yet — for multiple metrics today, scalarize via CompositeObjective.

Fields

n_trials: usize

Number of configurations to sample.

objectives: Vec<Objective>

The objectives to trade off against each other.

Implementations

impl SearchStrategy

pub fn n_trials(&self) -> Option<usize>

Planned number of trials (if known).

Trait Implementations

impl Clone for SearchStrategy

fn clone(&self) -> SearchStrategy

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SearchStrategy

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for SearchStrategy

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for SearchStrategy

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

where __S: Serializer,

Serialize this value into the given Serde serializer.