November 2019
Intermediate to advanced
320 pages
13h 35m
French
Content preview from Machine Learning avec Scikit-Learn
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8.3 PCA
211
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À chaque composante principale, PCA associe un vecteur unitaire de même
orientation que cet axe. Étant donné qu’il peut y avoir pour un même axe
deux vecteurs unitaires de direction opposée, la direction des vecteurs uni-
taires renvoyés par PCA n’est pas stable. Si vous perturbez légèrement le jeu
d’entraînement et relancez l’analyse, certaines des nouvelles composantes
principales pointeront peut-être dans la direction opposée à celle obtenue
précédemment. Cependant, on retrouvera en général les mêmes axes. Dans
certains cas, il peut y avoir rotation ou retournement d’une paire ...
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