May 2020
Intermediate to advanced
576 pages
26h 55m
French
Content preview from Deep Learning avec Keras et TensorFlow
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270
Chapitre 7. Traitement des séries avec des RNR et des CNN
Tout cela semble bien prometteur, mais comment entraîne-t-on un réseau de neu-
rones récurrents
?
7.2 ENTRAÎNER DES RNR
Pour entraîner un RNR, l’astuce consiste à le déplier dans le temps (comme nous
l’avons fait), puis à simplement employer une rétropropagation classique (voir la
gure7.5). Cette stratégie est appelée rétropropagation dans le temps (BPTT, backpro
-
pagation through time).
À l’instar de la rétropropagation classique, il existe une première passe vers l’avant
au travers du réseau déplié (représentée par les èches en pointillé). La série de sortie
est ensuite évaluée à l’aide ...
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