Struct ArchSampler 

pub struct ArchSampler { /* private fields */ }

Samples and mutates architectures within an ArchSearchSpace.

Implementations

impl ArchSampler

pub fn new(space: ArchSearchSpace, seed: u64) -> Self

Create a new sampler for the given search space, seeded for reproducibility.

pub fn random_architecture(&mut self) -> TrainResult<Architecture>

Sample a uniformly random architecture within the search space.

Depth is drawn uniformly from [min_depth, max_depth]. Each layer’s op, width, and activation are drawn independently and uniformly from their respective option lists.

pub fn mutate(&mut self, arch: &Architecture) -> TrainResult<Architecture>

Mutate one aspect of arch at random, returning a new valid architecture.

Four mutations are selected uniformly at random:

Index	Mutation
0	Change a random layer’s op
1	Change a random layer’s width
2	Change a random layer’s activation
3	Add a layer (if depth < max_depth) or remove one (if depth > min_depth); if neither is possible, fall back to changing op

pub fn gen_range_usize(&mut self, lower: usize, upper: usize) -> usize

Generate a uniformly random usize in [lower, upper).

Used by super::RegularizedEvolution to share the sampler’s RNG for tournament index shuffling. Returns lower when upper <= lower.