# Retropropagazione (backpropagation) La backpropagation รจ una della pietre miliari del Machine Learning, si applica principalmente alla rete neurale. ( diamo per scontato si sappia cosi sia una rete neurale a livello base) Per spigare passo passo la BP (backpropagation) utilizzeremo un semplice rete neurale sotto riportata: [![neural_network-7.png](https://cms.marcocucchi.it/uploads/images/gallery/2023-01/scaled-1680-/vejHKNsD9PMm5Tvr-neural-network-7.png)](https://cms.marcocucchi.it/uploads/images/gallery/2023-01/vejHKNsD9PMm5Tvr-neural-network-7.png) TODO [![neural_network-7.png](https://cms.marcocucchi.it/uploads/images/gallery/2023-01/scaled-1680-/vejHKNsD9PMm5Tvr-neural-network-7.png)](https://cms.marcocucchi.it/uploads/images/gallery/2023-01/vejHKNsD9PMm5Tvr-neural-network-7.png) [![neural_network-9.png](https://cms.marcocucchi.it/uploads/images/gallery/2023-01/scaled-1680-/oXAdPAENR8m2aw9A-neural-network-9.png)](https://cms.marcocucchi.it/uploads/images/gallery/2023-01/oXAdPAENR8m2aw9A-neural-network-9.png) [![latex.png](https://cms.marcocucchi.it/uploads/images/gallery/2023-01/scaled-1680-/u5MaERwDb402MGLC-latex.png)](https://cms.marcocucchi.it/uploads/images/gallery/2023-01/u5MaERwDb402MGLC-latex.png) [![latex2.png](https://cms.marcocucchi.it/uploads/images/gallery/2023-01/scaled-1680-/VNXnxW3NiHrVrDrm-latex2.png)](https://cms.marcocucchi.it/uploads/images/gallery/2023-01/VNXnxW3NiHrVrDrm-latex2.png) [![latex3.png](https://cms.marcocucchi.it/uploads/images/gallery/2023-01/scaled-1680-/2utX5ppQlgbzL6QM-latex3.png)](https://cms.marcocucchi.it/uploads/images/gallery/2023-01/2utX5ppQlgbzL6QM-latex3.png)