November 2019
Intermediate to advanced
320 pages
13h 35m
French
Content preview from Machine Learning avec Scikit-Learn
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7.2 Bagging et pasting
187
© Dunod – Toute reproduction non autorisée est un délit.
le préfère en général. Cependant, s’il vous reste du temps et sufsamment de ressources
informatiques, vous pouvez effectuer une validation croisée pour évaluer à la fois le
bagging et le pasting et sélectionner la méthode qui fonctionne le mieux.
7.2.2 Évaluation hors sélection
Avec le bagging, pour chacun des prédicteurs il se peut que certaines observations
soient utilisées plusieurs fois alors que d’autres ne sont jamais tirées. Par défaut,
un BaggingClassifier tire avec remise m observations d’entraînement
(bootstrap=True), où m est la taille du jeu d’entraînement. ...
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