aliasmethod

Implementation of Walker's Alias method by Rust.

The algorithm is principally useful when you need to random sampling with replacement by O(1).

Example

use rand::XorShiftRng;
use aliasmethod::AliasTable

let weights = vec![1.0, 1.0, 8.0];

let alias_table = AliasTable::new(weights)?;

let rng = XorShiftRng::from_seed([189522394, 1694417663, 1363148323, 4087496301]);
let n = alias_table.random(rng);

assert!(0 <= n && n <= weights.length);