Anomaly detection — the alert that fires on everything or nothing
Anomaly detectors flag points that do not fit a learned normal, and the entire product is the threshold: too tight and it is noise, too loose and it misses the one event that mattered.
Not yet scoped.
Why
The PoC runs isolation-forest and statistical detectors on transaction data and reports precision/recall at several thresholds, because the ROC curve is the honest deliverable.
How it works
Not yet built.
Where it lands in Jayverse
Auditor: report precision/recall at multiple thresholds for any anomaly flag it raises. An Auditor alert on suspicious settlement or transaction activity is only useful with an ROC curve behind it, not a single silent threshold nobody chose deliberately.
Verex: run an isolation-forest pass over order and fill data before trusting manual fraud rules. Compare a statistical anomaly detector's flagged trades against Verex's existing rule-based checks and report where they disagree.
gitboard: surface the threshold, not just the alert. Any anomaly-based alert gitboard displays should show what threshold produced it, so a noisy or missed alert can be tuned instead of silently ignored.
Key expressions
Words and phrases from this page worth keeping, with the Korean meaning and the sentence they come from.
Expression
뜻 · 쓰이는 자리
flag
(이상 징후로) 표시하다, 짚어내다 · 시스템이 의심스러운 항목을 골라낼 때. "Anomaly detectors flag points"
fit a learned normal
학습된 '정상' 패턴에 들어맞다 · 데이터가 모델이 배운 평범한 범위 안에 있을 때. "do not fit a learned normal"
the entire product is the threshold
제품 전체가 결국 그 임계값 하나로 귀결된다 · 성패가 딱 하나의 기준값 설정에 달려 있을 때. "the entire product is the threshold"
miss (an event)
(중요한 것을) 놓치다 · 탐지기가 정작 중요한 사건을 못 잡아낼 때. "it misses the one event that mattered"
the honest deliverable
있는 그대로 보여주는 결과물 · 과장 없이 진짜 성능을 드러내는 산출물. "the ROC curve is the honest deliverable"
ROC
수신자 조작 특성 곡선(Receiver Operating Characteristic curve) · 여러 임계값에서 정밀도-재현율 트레이드오프를 보여주는 평가 곡선. "the ROC curve is the honest deliverable"
isolation-forest
아이솔레이션 포레스트(Isolation Forest) · 데이터를 무작위로 분할해 이상치를 빠르게 고립시켜 탐지하는 알고리즘. "runs isolation-forest and statistical detectors"