Return AUC 0.5 if nPos==0 || nNeg==0

2025-05-14 13:15:33 +02:00
parent b639a2d79a
commit e64e281b63
1 changed files with 2 additions and 1 deletions
--- a/src/main/RocAuc.cpp
+++ b/src/main/RocAuc.cpp
@@ -48,6 +48,7 @@ namespace platform {
        double tp = 0, fp = 0;
        double totalPos = std::count(y_test.begin(), y_test.end(), classIdx);
        double totalNeg = nSamples - totalPos;
+        if (totalPos == 0 || totalNeg == 0) return 0.5; // neutral AUC

        for (const auto& [score, label] : scoresAndLabels) {
            if (label == 1) {