Neural Networks and Deep Learning -- Class 4: Deep Neural Networks
4.1 深层神经网络 浅层网络 -> 深层网络 有些函数只有深度模型才可以学习，浅层模型学习不了 4.2 深层网络中的前向传播 z[l]=w[l]a[l-1]+b[l] a[l]=g[l](z[l]) 对每一层的前向传播，需要用for循环 1-> L 4.3 核对矩阵的维数 由网络结构推导出 每一层的输入与输出矩阵的维度 => W维度: W[L]=(n(l),n(l-1)) dW相同 b维度：b[
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