Accuracy of the threshold-based anomaly detector for different thresholds, and of k-means anomaly detector method. Each method (columns) is evaluated for test sets (rows) of pre-merger galaxies divided according to their flux ratio between the central galaxy and the brightest neighbour (Fc/Fn). Thresholds 1, 2, and 3 represent the three thresholds defined as the value that contains, respectively, 85, 90, and 95 per cent of the training galaxies within the generative distribution. The last column indicates the accuracy according to the k-means clustering method.
| Accuracy of the anomaly detector . | ||||
|---|---|---|---|---|
| . | Threshold . | . | ||
| . | 1 . | 2 . | 3 . | k-means . |
| Fr < 1.5 | 96 per cent | 93 per cent | 86 per cent | 91 per cent |
| 1.5 < Fr < 2 | 94 per cent | 90 per cent | 76 per cent | 93 per cent |
| Fr > 2 | 75 per cent | 66 per cent | 48 per cent | 39 per cent |
| Accuracy of the anomaly detector . | ||||
|---|---|---|---|---|
| . | Threshold . | . | ||
| . | 1 . | 2 . | 3 . | k-means . |
| Fr < 1.5 | 96 per cent | 93 per cent | 86 per cent | 91 per cent |
| 1.5 < Fr < 2 | 94 per cent | 90 per cent | 76 per cent | 93 per cent |
| Fr > 2 | 75 per cent | 66 per cent | 48 per cent | 39 per cent |
Accuracy of the threshold-based anomaly detector for different thresholds, and of k-means anomaly detector method. Each method (columns) is evaluated for test sets (rows) of pre-merger galaxies divided according to their flux ratio between the central galaxy and the brightest neighbour (Fc/Fn). Thresholds 1, 2, and 3 represent the three thresholds defined as the value that contains, respectively, 85, 90, and 95 per cent of the training galaxies within the generative distribution. The last column indicates the accuracy according to the k-means clustering method.
| Accuracy of the anomaly detector . | ||||
|---|---|---|---|---|
| . | Threshold . | . | ||
| . | 1 . | 2 . | 3 . | k-means . |
| Fr < 1.5 | 96 per cent | 93 per cent | 86 per cent | 91 per cent |
| 1.5 < Fr < 2 | 94 per cent | 90 per cent | 76 per cent | 93 per cent |
| Fr > 2 | 75 per cent | 66 per cent | 48 per cent | 39 per cent |
| Accuracy of the anomaly detector . | ||||
|---|---|---|---|---|
| . | Threshold . | . | ||
| . | 1 . | 2 . | 3 . | k-means . |
| Fr < 1.5 | 96 per cent | 93 per cent | 86 per cent | 91 per cent |
| 1.5 < Fr < 2 | 94 per cent | 90 per cent | 76 per cent | 93 per cent |
| Fr > 2 | 75 per cent | 66 per cent | 48 per cent | 39 per cent |
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