Sections 22-23
Failure and outlier analysis
Categories derived directly from the exported clustering: unusually small (rare/outlier) clusters and unusually mixed (low-purity) clusters. No image here is described as a disease case -- rarity and impurity are properties of this clustering run, not clinical findings.
Rare does not mean pathological
A small cluster may reflect a genuinely rare morphology, a technical artifact (blur, background, staining edge case), or simply sampling noise at this benchmark's subsample size -- these are not distinguished automatically and should not be conflated.
PathMNIST (histopathology)
Small / possible outlier clusters
| Cluster | Size | Purity | Majority label |
|---|
No cluster fell below the size threshold in this run.
Mixed (low-purity) clusters
| Cluster | Size | Purity | Distinct labels | Majority label |
|---|---|---|---|---|
| #2 | 294 | 0.34 | 7 | smooth muscle |
| #1 | 205 | 0.43 | 7 | lymphocytes |
BloodMNIST (blood cell microscopy)
Small / possible outlier clusters
| Cluster | Size | Purity | Majority label |
|---|
No cluster fell below the size threshold in this run.
Mixed (low-purity) clusters
| Cluster | Size | Purity | Distinct labels | Majority label |
|---|---|---|---|---|
| #6 | 104 | 0.20 | 8 | erythroblast |
| #1 | 224 | 0.27 | 8 | basophil |
| #0 | 122 | 0.32 | 7 | monocyte |
| #3 | 124 | 0.42 | 8 | eosinophil |
| #5 | 61 | 0.46 | 8 | monocyte |
| #4 | 203 | 0.49 | 7 | platelet |