the stager stopped doing the same work three times - #49
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_windowRmssd and _windowRemFeatures each hand-copied _cleanBeatsInWindow, which is exactly what that function's docstring says can't happen. folded both back into it; the rem one passes halfWinMs: 90s because its window is deliberately different (spanSec, the 240-point ls grid and the <16 abstain gate are all specified against ±90s, not ±2.5min) — noted that in the doc so nobody "simplifies" it later. also fixed the docstring rationale: it claimed the beats had to match so the z-scores stayed comparable, but rmssd isn't z-scored any more. real-night gate unchanged: wake=52 rem=300 nrem=716 deep=137, same confidence to the last digit.
the rolling hr baseline took median(win) and percentile(win, 25) of the same 361-epoch window, and each of those sorted a fresh copy — 25 lines above the comment bragging about saving sorts. sort win in place once (it's built right there) and take both off it. also hoisted the median(sleepHr) that ran twice in the night-observation record. percentileSorted keeps the double? / null-on-empty contract. the two private _percentileSorted copies in advanced_stager and load_trimp return 0 on empty — not promoting that, a 0.0 bpm hr floor recorded as a measurement is a bug we've already had. deduping those two is a separate job. real-night gate unchanged: wake=52 rem=300 nrem=716 deep=137.
the per-epoch window gather walked all ~40k beats of the night to find the few hundred inside ±2.5 min, once per epoch per feature. lower-bound in, break at the far edge. the bound has to be a TRUE lower bound. rr_ts_ms is rec_ts * 1000 so beats tie on the second boundary, and "first index strictly greater than lo" drops the tied beats sitting on the edge — i tried it: deep goes 137 -> 132 epochs on the real night, silently. test pins ties at both edges and fails on that exact mutation. no cursor threaded through the epoch loop on purpose — centreMs comes from accel, not rrTsMs, so a cross-epoch cursor would assume an ordering the caller was never asked for. cardioStager on the real night: ~950ms -> ~805ms, so about 15%. not more — lomb-scargle's trig is the rest of it and this doesn't touch it. counts unchanged: wake=52 rem=300 nrem=716 deep=137.
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📝 WalkthroughWalkthroughCardio staging now requires ascending RR timestamps, centralizes RR-window cleaning, and reuses cleaned beats across RMSSD, SDNN, and REM features. Sorted percentile support avoids repeated sorting. Heart-rate baseline values reuse computed medians. ChangesCardio staging updates
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟡 Moderate · up to The performance change now relies on sorted RR timestamps; with unsorted input, valid beats may be omitted and heart-rate metrics or sleep-stage classification may change. Merge should wait for support for unsorted timestamps or explicit owner acceptance of this bounded correctness risk. Sequence Diagram(s)sequenceDiagram
participant CardioStager
participant RRWindowCleaner
participant RRSeries
participant FeatureCalculations
CardioStager->>RRWindowCleaner: Request RR window
RRWindowCleaner->>RRSeries: Locate ascending timestamp bounds
RRSeries-->>RRWindowCleaner: Return candidate beats and timestamps
RRWindowCleaner-->>CardioStager: Return cleaned beats and rebased timestamps
CardioStager->>FeatureCalculations: Calculate RMSSD, SDNN, or REM features
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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@coderabbitai review stacked on #48, targets that branch. same deal — this one is meant to be bit-identical on output, so any behaviour change you spot is a bug not a tradeoff. |
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@coderabbitai review merged main in — targets main directly now, suite green. this one is meant to be bit-identical on output. the safety argument is that the real-night stager numbers do not move: epochs=1068 wake=52 rem=300 nrem=716 deep=137 light=579 conf=0.5501404494382023, unchanged across all three commits. the place to look hardest is the binary search in also: |
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echo '== PR metadata and changed files =='
gh pr view 49 --repo OpenStrap/analytics --json baseRefName,headRefName,commits,files \
--jq '{baseRefName, headRefName, commits: [.commits[] | {oid, messageHeadline}], files: [.files[] | {path, additions, deletions}]}'
echo
echo '== Diff against main =='
git diff --find-renames --find-copies origin/main...HEAD
echo
echo '== Candidate source and test files =='
fd -t f . | rg -i '(stager|sleep|cardio|test|spec)' | head -250
echo
echo '== Relevant symbols with context =='
rg -n -C 8 '(_cleanBeatsInWindow|percentileSorted|_windowRmssd|_windowRemFeatures|_percentileSorted)' .Length of output: 42093 🏁 Script executed: #!/bin/bash
set -euo pipefail
echo '== Utility implementation =='
ast-grep outline lib/src/onehz/util.dart --items all --type function --match 'stddev|percentile|median'
sed -n '1,100p' lib/src/onehz/util.dart
echo
echo '== Local baseline production and consumption =='
rg -n -C 12 '(hrArousalLocal|hrMedLocal|hrP25Local|stddev\(win\))' \
lib/src/onehz/sleep/cardio_stager.dart
echo
echo '== Real-night test assertions and fixture-loading path =='
ast-grep outline test/onehz/real_night_cardio_stager_test.dart --items all --type function
sed -n '1,190p' test/onehz/real_night_cardio_stager_test.dart
echo
echo '== Changed-cardio lines with merge-base version =='
git show origin/main:lib/src/onehz/sleep/cardio_stager.dart | sed -n '650,710p'Length of output: 20781
Compute the standard deviation before the in-place sort. Then use the sorted list only for final sd = stddev(win);
win.sort();
final m = percentileSorted(win, 50);
if (m != null) {
hrMedLocal[e] = m;
hrArousalLocal[e] = m + math.max(6.0, sd ?? 6);
hrP25Local[e] = percentileSorted(win, 25) ?? m;
}The
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'stddev doesn't care about order' is true in algebra and false in float — it sums (x-m)^2 in list order and mean does too. sorting the window first moved the last bits of hrArousalLocal, which decides wake epochs near the threshold. the real night didn't move, but bit-identical was the contract.
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Inline comments:
In `@lib/src/onehz/sleep/cardio_stager.dart`:
- Around line 369-371: Update _cleanBeatsInWindow to detect whether rrTsMs is
ascending; use the existing lower-bound window scan only for sorted input and
retain a linear filter fallback for unsorted timestamps so all in-window beats
contribute. Add a regression test covering unsorted RR timestamps and verifying
the resulting RMSSD, SDNN, and REM/deep staging behavior.
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lib/src/onehz/sleep/cardio_stager.dartlib/src/onehz/util.darttest/onehz/real_night_cardio_stager_test.darttest/onehz/util_test.dart
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@coderabbitai good catch, and it is exactly the thing this pr was supposed to be careful about. fixed in the comment i had written said "stddev doesn't care about order", which is true in algebra and false in float: it sums the real night did not move either way — same 1068/52/300/716/137/579 and the same confidence to the last digit — but "did not move on this night" is not the same as bit-identical, and bit-identical was the contract. |
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The real-night result is useful regression coverage. It does not by itself prove bit-identical behavior. The corrected evaluation order satisfies the stated output-invariance contract. 🐇 ✅ ✏️ Learnings added
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the producer already guarantees it — beats inherit their record's second, the records are sorted, and the loose-live-beat path re-sorts explicitly. an assert costs nothing in release and goes off in every test if that stops being true.
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Stacked on #48. Output must be bit-identical — there is no
kAlgoVersionbump in this PR, and if one becomes necessary the change is wrong.An optimizer pass went through the tree arguing for deletion; every claim it made was then handed to a separate agent that did not know who made it and was told to assume it was wrong. These three survived that. One claim elsewhere was refuted outright — structurally accurate, but its proposal was slower than the code it replaced.
the safety argument
The real-night gate asserts wide bands (
wakeMin < 35,remMin > 100) and would not have noticed a small move, so the numbers were pinned directly instead:Identical after all three commits, confidence to the last digit.
what changed
_windowRmssdand_windowRemFeatureseach hand-copied_cleanBeatsInWindow, which is the function whose own docstring promises the invariant they were breaking. Folded back in;_cleanBeatsInWindowtakeshalfWinMsnow. REM keeps its own 90 s window and the docstring says why, so nobody "simplifies" that later — handing it the ±150 s list re-spaces the Lomb–Scargle grid, defeats thebeats.length < 16abstain gate, and re-opens a previously fixed ANR. The stale rationale in that docstring is corrected too: rmssd is not z-scored any more.The rolling HR baseline sorted the same 361-epoch window twice, about 25 lines below a comment congratulating itself on not doing that.
percentileSortedsplit out ofpercentile, window sorted in place once, duplicatedmedian(sleepHr)hoisted.percentileSortedkeeps the nullable contract — there are two_percentileSortedcopies in this repo that return0on empty and they stay where they are; a 0-on-empty percentile beside a null-on-empty one is how a 0.0 bpm floor gets recorded as a measured baseline.Two window scans are binary searches now. True lower bound, per call, no cursor threaded through the epoch loop —
centreMscomes fromaccel, notrrTsMs, so a cross-epoch cursor would assume monotonicity nothing promises.The tie trap is pinned by a test, not a comment.
rr_ts_msisrec_ts * 1000, so beat timestamps tie. Writing the search the natural way — first index strictly greater — fails the new test 7 → 4 and moves the real night:deep 137 → 132,light 579 → 584. That mutation is now caught.measured
cardioStageron the full real night: ~950 ms → ~805 ms, about 15% (medians of 6 and 5 runs). The original claim implied ~200x; Lomb–Scargle's trig dominates and is untouched. The commit messages carry the measured figure, not the claimed one.580 tests, analyze clean.
deliberately not done
Deduping the two
_percentileSortedcopies. Hoisting the gather out of_windowRmssd/_windowSdnnto the epoch loop — it would halve that work again but changes two signatures. A runtime sorted-ness guard onrrTsMs, which would cost what the search saves; the requirement is documented instead.Summary by CodeRabbit
Bug Fixes
Tests