Implementation of Walker's Alias method by Rust.
The algorithm is principally useful when you need to random sampling with replacement by O(1).
```rust use aliasmethod::{newaliastable, alias_method}
let weights = vec![1.0, 1.0, 8.0]; match newaliastable(weights) { Err(e) => { println!(false, "error : {}", e); } Ok(aliastable) => { let n = aliasmethod().random(&alias_table); assert!(0 <= n && n <= weights.length); } ```