November 2019
Intermediate to advanced
320 pages
13h 35m
French
Content preview from Machine Learning avec Scikit-Learn
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8.2 Principales approches de la réduction de dimension
207
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sur lui-même, comme c’est le cas pour le fameux jeu de données expérimental Swiss
roll (gâteau roulé), représenté sur la gure 8.4.
Figure 8.4 – Jeu de données Swiss roll
En se contentant de projeter sur un plan (p. ex. en supprimant la coordonnée x
3
),
on écraserait ensemble plusieurs couches de la spirale, comme on peut le voir à gauche
de la gure 8.5. Ce que vous voulez en fait, c’est dérouler le gâteau pour obtenir le jeu
de données à droite de la gure 8.5.
Figure 8.5 – Projection sur un plan (à gauche) ou déroulement (à droite) ...
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