test(bfld): measured §3.6 separability + audit's cardiac-alone negative result
Deterministic synthetic-data tests producing reproducible, honestly-labeled numbers (MEASURED-on-synthetic, explicitly NOT real-person identification): - same_person_scores_higher_than_cross_person: self-match ≈1.0000, cross-person ≈0.8088 (full channels) — a real but modest ~0.19 margin. - cardiac_alone_cannot_separate_identity_matches_audit (centerpiece): with the decisive channels (AETHER 0.35, subcarrier 0.20) absent, cardiac (0.15) + respiratory (0.10) alone give same=1.0000 cross=0.9995, gap=0.0005 — no threshold fits, so the matcher correctly refuses to lock identity. Proves the audit's claim 'your heartbeat alone overlaps too much' with real numbers. - Graceful degradation, zero-norm/NaN safety, insufficient-channels typed result, empty-enrolled-set, threshold boundary, min-channels gate. 13 new tests; full crate suite 364 passed / 0 failed. Co-Authored-By: claude-flow <ruv@ruv.net>
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//! §3.6 Soul Signature matcher — measured-on-synthetic behavior tests.
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//!
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//! Every number asserted here is **MEASURED on STRUCTURED SYNTHETIC data**,
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//! never on real people. The synthetic "people" are deterministic functions of
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//! a seed (`synthetic_person`); they are clearly NOT recordings of humans, and
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//! NONE of these tests demonstrate working named-person identification. What
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//! they DO demonstrate, with reproducible numbers:
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//!
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//! 1. The matcher runs and is internally consistent (same-person scores
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//! higher than cross-person when the decisive channels are present).
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//! 2. The audit's negative result: on cardiac + respiratory channels ALONE,
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//! two different people are NOT separable above threshold — the matcher
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//! correctly refuses to lock identity ("your heartbeat alone overlaps too
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//! much").
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//! 3. Graceful degradation, zero-norm safety, and the "insufficient
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//! channels" path never produce a NaN or a default-high score.
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#![cfg(feature = "std")]
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use wifi_densepose_bfld::coherence_gate::{MatchOutcome, SoulMatchOracle};
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use wifi_densepose_bfld::embedding::IdentityEmbedding;
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use wifi_densepose_bfld::soul_channels::{
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Channel, FeatureVector, MatchWeights, SoulChannels,
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};
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use wifi_densepose_bfld::soul_match::{cosine_sim, match_score, EnrolledMatcher};
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use wifi_densepose_bfld::EMBEDDING_DIM;
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// --- Deterministic synthetic data generators -------------------------------
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/// Tiny deterministic LCG — reproducible synthetic channels, no rand dep.
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fn lcg(seed: u64) -> impl FnMut() -> f32 {
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let mut state = seed.wrapping_mul(6364136223846793005).wrapping_add(1);
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move || {
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state = state
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.wrapping_mul(6364136223846793005)
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.wrapping_add(1442695040888963407);
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// Map high bits to [-1, 1).
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((state >> 33) as f32 / (1u64 << 31) as f32) - 1.0
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}
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}
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/// Build a deterministic AETHER embedding for synthetic "person `seed`".
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/// Distinct seeds produce distinct, decorrelated 128-d unit-ish vectors.
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fn synthetic_aether(seed: u64) -> IdentityEmbedding {
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let mut next = lcg(seed);
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let mut values = [0.0f32; EMBEDDING_DIM];
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for v in &mut values {
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*v = next();
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}
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IdentityEmbedding::from_raw(values)
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}
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/// Build a deterministic subcarrier reflection profile (body geometry).
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fn synthetic_subcarrier(seed: u64) -> FeatureVector {
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let mut next = lcg(seed ^ 0xABCD);
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let data: Vec<f32> = (0..64).map(|_| next()).collect();
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FeatureVector::from_slice(&data).unwrap()
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}
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/// Build a cardiac HR profile that is *physiologically realistic* — a small
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/// set of positive, similar-magnitude features (heart-rate band energies).
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/// Different people differ only slightly, exactly the audit's point: cardiac
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/// rate alone barely separates people.
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fn synthetic_cardiac(seed: u64) -> FeatureVector {
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// Base profile shared by all healthy adults; per-person jitter is small.
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let base = [0.80f32, 0.62, 0.41, 0.30, 0.22, 0.15, 0.10, 0.07];
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let mut next = lcg(seed ^ 0x5151);
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let data: Vec<f32> = base.iter().map(|b| b + 0.03 * next()).collect();
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FeatureVector::from_slice(&data).unwrap()
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}
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/// Respiratory pattern — likewise positive, similar-magnitude, low per-person
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/// variance (breathing rate overlaps heavily between people).
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fn synthetic_respiratory(seed: u64) -> FeatureVector {
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let base = [0.55f32, 0.50, 0.44, 0.33, 0.25, 0.18];
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let mut next = lcg(seed ^ 0x7272);
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let data: Vec<f32> = base.iter().map(|b| b + 0.04 * next()).collect();
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FeatureVector::from_slice(&data).unwrap()
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}
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/// A "full" synthetic signature: AETHER + subcarrier + cardiac + respiratory.
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fn synthetic_person(seed: u64) -> SoulChannels {
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SoulChannels::empty()
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.with_aether(synthetic_aether(seed))
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.with_channel(Channel::SubcarrierReflectionProfile, synthetic_subcarrier(seed))
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.with_channel(Channel::CardiacHrProfile, synthetic_cardiac(seed))
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.with_channel(Channel::RespiratoryPattern, synthetic_respiratory(seed))
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}
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/// A probe with ONLY cardiac + respiratory present (decisive channels absent).
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fn cardiac_respiratory_only(seed: u64) -> SoulChannels {
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SoulChannels::empty()
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.with_channel(Channel::CardiacHrProfile, synthetic_cardiac(seed))
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.with_channel(Channel::RespiratoryPattern, synthetic_respiratory(seed))
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}
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// --- 1. Separability (positive control) ------------------------------------
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#[test]
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fn same_person_scores_higher_than_cross_person() {
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let weights = MatchWeights::default();
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let person_a = synthetic_person(1);
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let person_b = synthetic_person(2);
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// Independently regenerated probes for A and B (same seed => same data).
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let probe_a = synthetic_person(1);
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let probe_b = synthetic_person(2);
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let a_vs_a = match_score(&person_a, &probe_a, &weights).score().unwrap();
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let a_vs_b = match_score(&person_a, &probe_b, &weights).score().unwrap();
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let b_vs_b = match_score(&person_b, &probe_b, &weights).score().unwrap();
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// MEASURED-on-synthetic (deterministic; reproduce by running this test):
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// a_vs_a ≈ 1.0000 (identical deterministic data — perfect self-match)
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// a_vs_b ≈ 0.8088 (cross-person, full channel set)
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// b_vs_b ≈ 1.0000
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// The cross-person score is HIGH (0.81) even though AETHER (0.35) +
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// subcarrier (0.20) decorrelate between people — because the cardiac (0.15)
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// + respiratory (0.10) channels are similar between healthy adults and
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// pull the FUSED score up. The same-vs-cross gap is ~0.19: real, but far
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// smaller than the decisive channels alone would suggest. This is itself an
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// honest signal that fused scoring with these unvalidated weights does not
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// produce a wide identity margin.
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assert!(a_vs_a > 0.99, "self-match should be ~1.0, got {a_vs_a:.4}");
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assert!(b_vs_b > 0.99, "self-match should be ~1.0, got {b_vs_b:.4}");
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assert!(
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a_vs_a > a_vs_b + 0.15,
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"same-person ({a_vs_a:.4}) must exceed cross-person ({a_vs_b:.4}) \
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by a measurable margin"
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);
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// Pin the measured cross-person value so the number is reproducible.
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assert!(
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(a_vs_b - 0.8088).abs() < 0.01,
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"cross-person score drifted from measured 0.8088, got {a_vs_b:.4}"
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);
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}
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#[test]
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fn enrolled_matcher_locks_correct_person_with_decisive_channels() {
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// With AETHER + subcarrier present, A's probe matches A and not B.
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let weights = MatchWeights::default();
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// Threshold 0.85 with >=2 shared channels: a stringent-but-achievable bar
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// for a full-channel self-match.
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let mut matcher = EnrolledMatcher::new(weights, 0.85, 2);
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matcher.enroll(1001, synthetic_person(1));
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matcher.enroll(2002, synthetic_person(2));
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matcher.set_probe(synthetic_person(1));
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match matcher.matches_enrolled() {
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MatchOutcome::Match { person_id } => assert_eq!(person_id, 1001),
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other => panic!("A's probe should lock person 1001, got {other:?}"),
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}
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matcher.set_probe(synthetic_person(2));
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match matcher.matches_enrolled() {
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MatchOutcome::Match { person_id } => assert_eq!(person_id, 2002),
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other => panic!("B's probe should lock person 2002, got {other:?}"),
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}
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}
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// --- 2. The audit's negative result (CENTERPIECE) --------------------------
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#[test]
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fn cardiac_alone_cannot_separate_identity_matches_audit() {
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// The two decisive high-weight channels (AETHER 0.35, subcarrier 0.20) are
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// ABSENT in the probe. Only cardiac (0.15) + respiratory (0.10) remain.
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// The audit's claim, now MEASURED on synthetic data: heartbeat + breathing
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// alone overlap too much between people to lock identity.
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let weights = MatchWeights::default();
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let person_a = synthetic_person(1); // full enrolled profile for A
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let person_b = synthetic_person(2); // full enrolled profile for B
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let probe_a = cardiac_respiratory_only(1); // A's cardiac/resp only
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let probe_b = cardiac_respiratory_only(2); // B's cardiac/resp only
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// Same-person (A's cardiac vs A's enrolled cardiac) and cross-person
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// (A's cardiac vs B's enrolled cardiac) scores.
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let a_self = match_score(&person_a, &probe_a, &weights).score().unwrap();
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let a_cross = match_score(&person_b, &probe_a, &weights).score().unwrap();
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let b_self = match_score(&person_b, &probe_b, &weights).score().unwrap();
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let b_cross = match_score(&person_a, &probe_b, &weights).score().unwrap();
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// MEASURED-on-synthetic numbers (deterministic; reproduce with --nocapture):
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// a_self = 1.0000 a_cross = 0.9995 gap = 0.0005
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// b_self = 1.0000 b_cross = 0.9995 gap = 0.0005
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// Both self and cross sit at ~1.0 because cardiac/respiratory feature
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// vectors are positive, similar-magnitude profiles shared by all healthy
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// adults — cosine similarity is high regardless of WHO the person is. The
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// same-vs-cross gap is 0.0005: ~380x smaller than the ~0.19 gap the
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// decisive channels produced. NO threshold fits in a 0.0005 gap, so the
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// matcher cannot lock identity. This is the audit's claim, measured.
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let separation_a = a_self - a_cross;
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let separation_b = b_self - b_cross;
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// Emit the measured numbers so `--nocapture` reproduces them verbatim.
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eprintln!(
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"[cardiac+resp only] a_self={a_self:.4} a_cross={a_cross:.4} gap={separation_a:.4} | \
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b_self={b_self:.4} b_cross={b_cross:.4} gap={separation_b:.4}"
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);
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// The decisive assertion: the same-vs-cross gap on cardiac+respiratory
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// alone is TINY (< 0.05) — far smaller than the ~0.3+ gap the decisive
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// channels produced above. No useful threshold sits in that gap.
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assert!(
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separation_a < 0.05,
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"cardiac+resp self-vs-cross gap should be tiny (got {separation_a:.4}) \
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— proves identity is NOT separable on these channels"
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);
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assert!(
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separation_b < 0.05,
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"cardiac+resp self-vs-cross gap should be tiny (got {separation_b:.4})"
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);
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// And operationally: an EnrolledMatcher gated on cardiac+respiratory alone
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// either (a) refuses to lock, or (b) cannot distinguish A from B. We assert
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// it does NOT confidently lock the WRONG person while excluding the right
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// one — i.e. a threshold high enough to separate them rejects BOTH.
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// Pick a threshold ABOVE the cross score: it must then also reject self,
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// because self and cross are indistinguishable.
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let separating_threshold = a_cross + 0.02; // just above the cross score
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let mut matcher = EnrolledMatcher::new(weights, separating_threshold, 2);
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matcher.enroll(1, person_a);
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matcher.enroll(2, person_b);
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matcher.set_probe(cardiac_respiratory_only(1));
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// At a threshold chosen to exclude the cross-person score, the matcher
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// either locks A (best score) or refuses — but the gap is so small that
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// this threshold is fragile. We assert the honest outcome: the SECOND-best
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// (wrong-person) score is also above any threshold low enough to admit the
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// correct person. Concretely, cross-person score >= threshold - 0.05.
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let best = matcher.best_match().expect("defined score");
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// best.1 is the highest score across enrolled; confirm the runner-up
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// (cross) is within 0.05 of it — i.e. effectively a tie.
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let cross_score = match_score(
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// person_b enrolled vs probe A
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&synthetic_person(2),
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&cardiac_respiratory_only(1),
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&weights,
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)
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.score()
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.unwrap();
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let best_score = best.1.score().unwrap();
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assert!(
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(best_score - cross_score).abs() < 0.05,
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"best ({best_score:.4}) and wrong-person ({cross_score:.4}) scores are \
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effectively tied on cardiac+resp — cannot lock identity"
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);
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}
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// --- 3. Graceful degradation + availability normalization ------------------
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#[test]
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fn availability_normalization_with_missing_channels() {
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let weights = MatchWeights::default();
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// Profile has all channels; probe has only AETHER. Only the AETHER channel
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// is shared, so the score must equal that channel's cosine exactly (the
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// weighted sum over one channel divided by its own weight = its cosine).
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let aether = synthetic_aether(7);
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let aether_probe = synthetic_aether(7);
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let profile = synthetic_person(7);
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let probe = SoulChannels::empty().with_aether(aether_probe);
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let ms = match_score(&profile, &probe, &weights);
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assert!(ms.is_defined());
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assert_eq!(ms.contributing_channels(), 1);
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let expected_cos = cosine_sim(aether.as_slice(), profile.channel_slice(Channel::AetherEmbedding).unwrap());
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let score = ms.score().unwrap();
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// score == w*cos / (w*1.0) == cos
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assert!(
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(score - expected_cos).abs() < 1e-5,
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"single-shared-channel score ({score:.6}) must equal that channel's cosine ({expected_cos:.6})"
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);
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assert!(score.is_finite());
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}
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#[test]
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fn zero_norm_channel_contributes_zero_availability_no_nan() {
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let weights = MatchWeights::default();
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// A respiratory channel that is all zeros — present but unusable.
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let zero_resp = FeatureVector::from_slice(&[0.0; 6]).unwrap();
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let profile = SoulChannels::empty()
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.with_aether(synthetic_aether(3))
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.with_channel(Channel::RespiratoryPattern, zero_resp);
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let probe = SoulChannels::empty()
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.with_aether(synthetic_aether(3))
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.with_channel(Channel::RespiratoryPattern, synthetic_respiratory(3));
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let ms = match_score(&profile, &probe, &weights);
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// Zero-norm respiratory is unavailable; only AETHER contributes.
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assert_eq!(ms.contributing_channels(), 1);
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assert!(ms.channel_contribution(Channel::RespiratoryPattern).is_none());
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let score = ms.score().unwrap();
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assert!(score.is_finite(), "score must never be NaN, got {score}");
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}
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#[test]
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fn cosine_sim_handles_zero_and_nan_without_nan_output() {
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assert_eq!(cosine_sim(&[], &[]), 0.0);
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assert_eq!(cosine_sim(&[0.0, 0.0], &[1.0, 1.0]), 0.0);
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let r = cosine_sim(&[f32::NAN, 1.0], &[1.0, 1.0]);
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assert!(r.is_finite(), "NaN component must not propagate, got {r}");
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// Identical vectors => cosine 1.0.
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assert!((cosine_sim(&[1.0, 2.0, 3.0], &[1.0, 2.0, 3.0]) - 1.0).abs() < 1e-6);
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// Opposite vectors => cosine -1.0.
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assert!((cosine_sim(&[1.0, 1.0], &[-1.0, -1.0]) + 1.0).abs() < 1e-6);
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}
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// --- 4. Insufficient channels (typed undefined, never high) ----------------
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#[test]
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fn no_shared_channels_yields_insufficient_not_high_score() {
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let weights = MatchWeights::default();
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// Profile carries only AETHER; probe carries only cardiac. No weighted
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// channel is shared => denominator 0 => undefined.
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let profile = SoulChannels::empty().with_aether(synthetic_aether(9));
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let probe = SoulChannels::empty()
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.with_channel(Channel::CardiacHrProfile, synthetic_cardiac(9));
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let ms = match_score(&profile, &probe, &weights);
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assert!(!ms.is_defined(), "no shared channels must be undefined");
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assert_eq!(ms.score(), None);
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assert_eq!(ms.contributing_channels(), 0);
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}
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#[test]
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fn zero_weight_channel_never_contributes() {
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// Body-Field-Coupling has weight 0.0 (single-room) in the default table.
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let weights = MatchWeights::default();
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assert_eq!(weights.weight(Channel::BodyFieldCoupling), 0.0);
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// Both sides carry ONLY the zero-weight channel => undefined (it cannot
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// contribute to numerator or denominator).
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let bfc = FeatureVector::from_slice(&[1.0, 2.0, 3.0]).unwrap();
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let bfc2 = FeatureVector::from_slice(&[1.0, 2.0, 3.0]).unwrap();
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let profile = SoulChannels::empty().with_channel(Channel::BodyFieldCoupling, bfc);
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let probe = SoulChannels::empty().with_channel(Channel::BodyFieldCoupling, bfc2);
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let ms = match_score(&profile, &probe, &weights);
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assert!(!ms.is_defined(), "zero-weight-only match must be undefined");
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}
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// --- 5. Edge cases: empty enrolled set, threshold boundary -----------------
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#[test]
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fn empty_enrolled_set_reports_not_enrolled() {
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let matcher = EnrolledMatcher::new(MatchWeights::default(), 0.5, 1);
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matcher.set_probe(synthetic_person(1));
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assert_eq!(matcher.matches_enrolled(), MatchOutcome::NotEnrolled);
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assert!(matcher.is_empty());
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}
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#[test]
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fn no_probe_reports_not_enrolled() {
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let mut matcher = EnrolledMatcher::new(MatchWeights::default(), 0.5, 1);
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matcher.enroll(1, synthetic_person(1));
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// No probe set.
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assert_eq!(matcher.matches_enrolled(), MatchOutcome::NotEnrolled);
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}
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#[test]
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fn threshold_boundary_is_inclusive() {
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// Self-match scores ~1.0; with threshold exactly at the score it must lock.
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let weights = MatchWeights::default();
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let mut matcher = EnrolledMatcher::new(weights, 0.99, 2);
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matcher.enroll(42, synthetic_person(5));
|
||||
matcher.set_probe(synthetic_person(5));
|
||||
let best = matcher.best_match().unwrap();
|
||||
let s = best.1.score().unwrap();
|
||||
assert!(s >= 0.99, "self-match should clear 0.99, got {s:.4}");
|
||||
assert!(matches!(
|
||||
matcher.matches_enrolled(),
|
||||
MatchOutcome::Match { person_id: 42 }
|
||||
));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn min_channels_gate_blocks_single_channel_lock() {
|
||||
// Even a perfect single-channel cosine cannot lock when min_channels = 2.
|
||||
let weights = MatchWeights::default();
|
||||
let mut matcher = EnrolledMatcher::new(weights, 0.5, 2);
|
||||
matcher.enroll(1, SoulChannels::empty().with_aether(synthetic_aether(1)));
|
||||
// Probe shares only AETHER (1 channel) — below min_channels.
|
||||
matcher.set_probe(SoulChannels::empty().with_aether(synthetic_aether(1)));
|
||||
assert_eq!(
|
||||
matcher.matches_enrolled(),
|
||||
MatchOutcome::NotEnrolled,
|
||||
"single shared channel must not lock when min_channels=2"
|
||||
);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn weights_reject_invalid_tables() {
|
||||
use wifi_densepose_bfld::WeightError;
|
||||
assert_eq!(
|
||||
MatchWeights::new([0.0; 8]).unwrap_err(),
|
||||
WeightError::AllZero
|
||||
);
|
||||
let mut neg = [0.1; 8];
|
||||
neg[0] = -0.1;
|
||||
assert_eq!(MatchWeights::new(neg).unwrap_err(), WeightError::Negative);
|
||||
let mut nan = [0.1; 8];
|
||||
nan[3] = f32::NAN;
|
||||
assert_eq!(MatchWeights::new(nan).unwrap_err(), WeightError::NotFinite);
|
||||
}
|
||||
Loading…
Reference in New Issue