🏢 1️⃣ MOST USED METRICS IN INDUSTRY
Let’s be honest.
Out of 41 metrics, only ~12 are heavily used daily in real companies.
🔴 Classification (Industry Core)
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Accuracy (only when balanced)
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Precision
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Recall
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F1 Score
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ROC-AUC
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PR-AUC (very important in imbalance)
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Log Loss
🔵 Regression (Industry Core)
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MAE
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RMSE
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R²
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MAPE (forecasting)
🟢 Production Monitoring
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Drift metrics (PSI / KS)
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Calibration (Brier Score)
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Latency
🟡 Computer Vision
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mAP
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IoU
🟣 NLP
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BLEU / ROUGE (less in production)
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Perplexity (LLMs)
👉 80% of real-world ML uses:
Precision, Recall, F1, ROC-AUC, MAE, RMSE, R²
