43 lines
1.3 KiB
Rust
43 lines
1.3 KiB
Rust
#![no_main]
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//! Fuzz the `spacing` metric for non-negativity.
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use arbitrary::Arbitrary;
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use libfuzzer_sys::fuzz_target;
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use heuropt::core::candidate::Candidate;
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use heuropt::core::evaluation::Evaluation;
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use heuropt::core::objective::{Objective, ObjectiveSpace};
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use heuropt::metrics::spacing::spacing;
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#[derive(Arbitrary, Debug)]
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struct Input {
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points: Vec<(f64, f64)>,
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}
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fuzz_target!(|input: Input| {
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if input.points.len() > 64 {
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return;
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}
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// Bound magnitudes so distance computations don't overflow to
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// inf-inf=NaN — `spacing` is documented to operate on values produced
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// by `as_minimization` of problem evaluations, not arbitrary f64s.
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if input
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.points
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.iter()
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.any(|&(a, b)| !a.is_finite() || !b.is_finite() || a.abs() > 1e150 || b.abs() > 1e150)
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{
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return;
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}
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let space = ObjectiveSpace::new(vec![Objective::minimize("f1"), Objective::minimize("f2")]);
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let pop: Vec<Candidate<()>> = input
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.points
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.iter()
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.map(|&(a, b)| Candidate::new((), Evaluation::new(vec![a, b])))
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.collect();
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let s = spacing(&pop, &space);
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// Spacing can overflow to +∞ when point coordinates straddle ±f64::MAX.
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// Contract is non-negative + non-NaN.
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assert!(s >= 0.0, "spacing negative: {s}");
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assert!(!s.is_nan(), "spacing is NaN");
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});
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