rustworkx-core 0.17.1

Rust APIs used for rustworkx algorithms
Documentation 
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// Licensed under the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License. You may obtain
// a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations
// under the License.

use petgraph::visit::Reversed;
use rustworkx_core::centrality::closeness_centrality;
use rustworkx_core::petgraph::graph::{DiGraph, UnGraph};

#[test]
fn test_simple() {
    let test_case = |parallel_threshold: usize| {
        let g = UnGraph::<i32, ()>::from_edges([(1, 2), (2, 3), (3, 4), (1, 4)]);
        let c = closeness_centrality(&g, true, parallel_threshold);
        assert_eq!(
            vec![
                Some(0.0),
                Some(0.5625),
                Some(0.5625),
                Some(0.5625),
                Some(0.5625)
            ],
            c
        );
    };
    test_case(200); // sequential
    test_case(1); // parallel
}

#[test]
fn test_wf_improved() {
    let test_case = |parallel_threshold: usize| {
        let g = UnGraph::<i32, ()>::from_edges([(0, 1), (1, 2), (2, 3), (4, 5), (5, 6)]);
        let c = closeness_centrality(&g, true, parallel_threshold);
        assert_eq!(
            vec![
                Some(1.0 / 4.0),
                Some(3.0 / 8.0),
                Some(3.0 / 8.0),
                Some(1.0 / 4.0),
                Some(2.0 / 9.0),
                Some(1.0 / 3.0),
                Some(2.0 / 9.0)
            ],
            c
        );
        let cwf = closeness_centrality(&g, false, parallel_threshold);
        assert_eq!(
            vec![
                Some(1.0 / 2.0),
                Some(3.0 / 4.0),
                Some(3.0 / 4.0),
                Some(1.0 / 2.0),
                Some(2.0 / 3.0),
                Some(1.0),
                Some(2.0 / 3.0)
            ],
            cwf
        );
    };
    test_case(200); // sequential
    test_case(1); // parallel
}

#[test]
fn test_digraph() {
    let test_case = |parallel_threshold: usize| {
        let g = DiGraph::<i32, ()>::from_edges([(0, 1), (1, 2)]);
        let c = closeness_centrality(&g, true, parallel_threshold);
        assert_eq!(vec![Some(0.), Some(1. / 2.), Some(2. / 3.)], c);

        let cr = closeness_centrality(Reversed(&g), true, parallel_threshold);
        assert_eq!(vec![Some(2. / 3.), Some(1. / 2.), Some(0.)], cr);
    };
    test_case(200); // sequential
    test_case(1); // parallel
}

#[test]
fn test_k5() {
    let test_case = |parallel_threshold: usize| {
        let g = UnGraph::<i32, ()>::from_edges([
            (0, 1),
            (0, 2),
            (0, 3),
            (0, 4),
            (1, 2),
            (1, 3),
            (1, 4),
            (2, 3),
            (2, 4),
            (3, 4),
        ]);
        let c = closeness_centrality(&g, true, parallel_threshold);
        assert_eq!(
            vec![Some(1.0), Some(1.0), Some(1.0), Some(1.0), Some(1.0)],
            c
        );
    };
    test_case(200); // sequential
    test_case(1); // parallel
}

#[test]
fn test_path() {
    let test_case = |parallel_threshold: usize| {
        let g = UnGraph::<i32, ()>::from_edges([(0, 1), (1, 2)]);
        let c = closeness_centrality(&g, true, parallel_threshold);
        assert_eq!(vec![Some(2.0 / 3.0), Some(1.0), Some(2.0 / 3.0)], c);
    };
    test_case(200); // sequential
    test_case(1); // parallel
}