BP反向传播算法是如何工作的How the backpropagation algorithm works
Inthelastchapterwesawhowneuralnetworkscanlearntheirweightsandbiasesusingthegradientdescentalgorithm.Therewas,however,agapinourexplanation:wedidn'tdiscusshowtocomputethegradientofthecostfunction.That's