porco

Composable probability distributions.

https://docs.rs/porco

Examples

Create simple probability distributions.

enum Coin {
    Heads,
    Tails,
}
 
impl Coin {
    fn flip() -> Distribution<Coin> {
        Distribution::uniform([Coin::Heads, Coin::Tails])
    }
}
 
let coin = Coin::flip();
assert_eq!(coin.pmf(&Coin::Heads), Probability(0.5));

Compose operations over distributions using combinators.

fn reflip_if_tails(coin: Coin) -> Distribution<Coin> {
    match coin {
        Coin::Heads => Distribution::always(Coin::Heads),
        Coin::Tails => Coin::flip(),
    }
}
 
let coin = Coin::flip().and_then(reflip_if_tails);
assert_eq!(coin.pmf(&Coin::Heads), Probability(0.75));