potizo的博客

import tensorflow as tffrom tensorflow.examples.tutorials.mnist import input_data# from tensorflow.models import official.mnist.datasetmnist = input_data.read_data_sets('MNIST_data',one_hot=True)...

使用一个神经网络时,需要决定使用哪种激活函数用隐藏层上,哪种用在输出节点上。sigmoid: a=σ(z)=11+e−za = \sigma(z) = \frac{1}{{1 + e}^{- z}}a=σ(z)=1+e−z1​tanh: a=tanh(z)=ez−e−zez+e−za= tanh(z) = \frac{e^{z} - e^{- z}}{e^{z} + e^{- z}}a=tan...