jaccard

The Jaccard similarity of two sets: the size of their intersection over the size of their union.

1.0 means the sets are equal, 0.0 that they share nothing. Two empty sets are equal, so they score 1.0.

Import

use helpers4::set::jaccard;

Cargo feature set (enabled by default). To compile only this module:

cargo add helpers4 --no-default-features --features set

or in Cargo.toml:

[dependencies]
helpers4 = { version = "0.0.6", default-features = false, features = ["set"] }

Signature

pub fn jaccard<T: Eq + Hash, S: BuildHasher>(a: &HashSet<T, S>, b: &HashSet<T, S>) -> f64

Parameters

Parameter	Type	Description
a	&HashSet<T, S>	The first set.
b	&HashSet<T, S>	The second set.

Returns

f64 — A value between 0.0 and 1.0.

Examples

use helpers4::set::jaccard;
use std::collections::HashSet;

let a = HashSet::from([1, 2, 3]);
let b = HashSet::from([2, 3, 4]);
assert_eq!(jaccard(&a, &b), 0.5); // {2, 3} out of {1, 2, 3, 4}

Source

src/set/jaccard.rs