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Distance, Density and Isolation

Four detectors on data with two kinds of anomaly: distance from the centre scores below chance, an axis-parallel splitter never sees the gap, and the local method is defeated by anomalies that group together.

IntermediateModule 230 min · 120 XP
Two clusters with a sparse bridge between them, ellipses of equal Mahalanobis distance sweeping past the bridge without touching it, and a growing clump of anomalies making each other look ordinary.

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