solverforge-solver 0.8.6

Solver engine for SolverForge
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93

use super::*;
use solverforge_core::score::SoftScore;

#[derive(Clone)]
struct TestSolution {
    score: Option<SoftScore>,
}

impl PlanningSolution for TestSolution {
    type Score = SoftScore;

    fn score(&self) -> Option<Self::Score> {
        self.score
    }

    fn set_score(&mut self, score: Option<Self::Score>) {
        self.score = score;
    }
}

#[test]
fn test_accepts_improving_moves() {
    let mut acceptor = StepCountingHillClimbingAcceptor::<TestSolution>::new(5);
    acceptor.phase_started(&SoftScore::of(-100));

    assert!(acceptor.is_accepted(&SoftScore::of(-100), &SoftScore::of(-50)));
}

#[test]
fn test_accepts_non_improving_within_limit() {
    let mut acceptor = StepCountingHillClimbingAcceptor::<TestSolution>::new(5);
    acceptor.phase_started(&SoftScore::of(-100));

    assert!(acceptor.is_accepted(&SoftScore::of(-100), &SoftScore::of(-110)));
}

#[test]
fn test_rejects_after_limit_exceeded() {
    let mut acceptor = StepCountingHillClimbingAcceptor::<TestSolution>::new(3);
    acceptor.phase_started(&SoftScore::of(-100));

    assert!(acceptor.is_accepted(&SoftScore::of(-100), &SoftScore::of(-110)));
    acceptor.step_ended(&SoftScore::of(-110));

    assert!(acceptor.is_accepted(&SoftScore::of(-110), &SoftScore::of(-120)));
    acceptor.step_ended(&SoftScore::of(-120));

    assert!(acceptor.is_accepted(&SoftScore::of(-120), &SoftScore::of(-130)));
    acceptor.step_ended(&SoftScore::of(-130));

    assert!(!acceptor.is_accepted(&SoftScore::of(-130), &SoftScore::of(-140)));
}

#[test]
fn test_resets_on_improvement() {
    let mut acceptor = StepCountingHillClimbingAcceptor::<TestSolution>::new(3);
    acceptor.phase_started(&SoftScore::of(-100));

    acceptor.step_ended(&SoftScore::of(-110));
    acceptor.step_ended(&SoftScore::of(-120));
    assert_eq!(acceptor.steps_since_improvement, 2);

    acceptor.step_ended(&SoftScore::of(-50));
    assert_eq!(acceptor.steps_since_improvement, 0);

    acceptor.step_ended(&SoftScore::of(-60));
    acceptor.step_ended(&SoftScore::of(-70));
    assert!(acceptor.is_accepted(&SoftScore::of(-70), &SoftScore::of(-80)));
}

#[test]
fn test_improving_always_accepted_even_after_limit() {
    let mut acceptor = StepCountingHillClimbingAcceptor::<TestSolution>::new(2);
    acceptor.phase_started(&SoftScore::of(-100));

    acceptor.step_ended(&SoftScore::of(-110));
    acceptor.step_ended(&SoftScore::of(-120));

    assert!(!acceptor.is_accepted(&SoftScore::of(-120), &SoftScore::of(-130)));
    assert!(acceptor.is_accepted(&SoftScore::of(-120), &SoftScore::of(-50)));
}

#[test]
fn test_phase_reset() {
    let mut acceptor = StepCountingHillClimbingAcceptor::<TestSolution>::new(3);
    acceptor.phase_started(&SoftScore::of(-100));
    acceptor.step_ended(&SoftScore::of(-110));
    acceptor.step_ended(&SoftScore::of(-120));
    acceptor.phase_ended();

    acceptor.phase_started(&SoftScore::of(-200));
    assert_eq!(acceptor.steps_since_improvement, 0);
}