NeuralNetwork and DeepLearing----Shallow neural networks
摘自黃海廣等人筆記 1.激活函數（Activation funcions） 使用一個神經網絡時，需要確定哪種激活函數用在隱藏層上，哪種用在輸出節點上。 sigmoid函數：a = σ(z) = 11+e−z 1 1 + e − z 更通常的情況下，使用不同的函數g( z[1] z [ 1 ] )，g可以是除了sigmoid函數以外的非線性函數。tanh函數（雙曲線正切函數）是總體上都優於sigmo
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