November 2019
Intermediate to advanced
320 pages
13h 35m
French
Content preview from Machine Learning avec Scikit-Learn
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94
Chapitre 3. Classification
Mais attendez, pas si vite… Un classicateur à haute précision n’est pas très utile si
son rappel est trop bas!
Si quelqu’un vous dit « Visons une précision de 99 % », répondez-lui « Au
prix de quel rappel ? ».
3.3.5 La courbe ROC
La courbe d’efcacité du récepteur (Receiver Operating Characteristic ou ROC) est
un autre outil communément utilisé avec les classicateurs binaires. Elle est très sem-
blable à la courbe précision/rappel, mais au lieu de croiser la précision avec le rappel,
la courbe ROC croise le taux de vrais positifs (un autre nom pour le rappel) avec le
taux de faux positifs. Le taux de faux positifs ...
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