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Concept Drift Monitoring Logic

Find the sign error in a concept-drift accuracy-drop check.

Codepython
def check_concept_drift(recent_accuracies, baseline_accuracy, tolerance=0.1):
    avg_recent = sum(recent_accuracies) / len(recent_accuracies)
    # Concept drift = model accuracy has dropped meaningfully
    return avg_recent - baseline_accuracy > tolerance

What is the bug in this concept drift check?