我的下载链接

https://fdsmlhn.github.io/2017/10/22/Derivation%20of%20Back%20Propagation%20Through%20Time%20(BPTT)%20-%20Vanilla%20Recurrent%20Neural%20Network(RNN)/

https://towardsdatascience.com/derivative-of-the-softmax-function-and-the-categorical-cross-entropy-loss-ffceefc081d1