NeuralNetwork and DeepLearing----Shallow neural networks
摘自黄海广等人笔记 1.激活函数（Activation funcions） 使用一个神经网络时，需要确定哪种激活函数用在隐藏层上，哪种用在输出节点上。 sigmoid函数：a = σ(z) = 11+e−z 1 1 + e − z 更通常的情况下，使用不同的函数g( z[1] z [ 1 ] )，g可以是除了sigmoid函数以外的非线性函数。tanh函数（双曲线正切函数）是总体上都优于sigmo
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