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The receiver-operating characteristic (ROC) curve for the best trained deep learning model in sex prediction. The optimal threshold was selected by minimizing the Euclidean distance between the ROC curve and the (0, 1) point, which has a minimum value of (1 − sensitivity)2 + (1 − specificity)2. The optimal threshold of 0.8516 was also plotted on the ROC curve as the threshold (specificity, sensitivity).
