最简单的是。见官方帮助
Backpropagation Algorithm
There are many variations of the backpropagation algorithm, several of which are described in this chapter The simplest implementation of backpropagation learning updates the network weights and biases in the direction in which the performance function decreases most rapidly, the negative of the gradient。
matlab
用solve求解方程组没有解
符号方程求解:solve求解代数方程,方程组用linsolve,
数值解用vpasolve,格式[x1,s3,x3,x4]=vpasolve(eqns,vars,int_guess),分别是方程组,变量,初始值,
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