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Table 5.

Training on image data of Virgo and evaluating on Fornax image data.

Averaged per galaxy Average over all sources

Method TPR FPR FDR AUC ROC TPR FPR FDR AUC ROC # TPs # FPs
Nearest Neighbour 0.77 0.04 0.24 0.81 0.04 0.12 4982 650
12 Nearest Neighbours 0.75 0.03 0.20 0.96 0.81 0.03 0.09 0.97 4969 476
Random Forest 0.74 0.03 0.18 0.96 0.81 0.03 0.09 0.97 4985 495

Convolutional Neural Network (CNN) 0.90 0.03 0.14 0.99 0.94 0.04 0.09 0.99 5771 563
CNN + Nearest Neighbour 0.87 0.04 0.18 0.91 0.04 0.10 5634 633
CNN + 12 Nearest Neighbours 0.89 0.03 0.14 0.98 0.93 0.03 0.08 0.98 5729 517

Notes. The Fornax data contains in total 21 767 sources with 6161 catalogued GCs. Results are given for a decision threshold of 0.5.

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