Refactor

src/sampler/mod.rs

@@ -1,13 +1,10 @@
 //! Sampler trait and implementations for parameter sampling.
 
-mod random;
+pub mod random;
 pub mod tpe;
 
 use std::collections::HashMap;
 
-pub use random::RandomSampler;
-pub use tpe::{TpeSampler, TpeSamplerBuilder};
-
 use crate::distribution::Distribution;
 use crate::param::ParamValue;