标签：div tput ges ble blog ini 输出 exp utf-8
1、
函数
函数：f(z) = 1 / (1 + exp( ? z))
导数：f(z)‘ = f(z)(1 ? f(z))
2、tensorflow实现
#!/usr/bin/env python
# -*- coding: utf-8 -*-
import tensorflow as tf
input_data = tf.Variable( [[0, 10, -10],[1,2,3]] , dtype = tf.float32 )
output = tf.nn.sigmoid(input_data)
with tf.Session() as sess:
init = tf.initialize_all_variables()
sess.run(init)
print(sess.run(output))
输出为：
[[ 5.00000000e-01 9.99954581e-01 4.53978719e-05]
[ 7.31058598e-01 8.80797029e-01 9.52574134e-01]]
标签：div tput ges ble blog ini 输出 exp utf-8
原文地址：http://www.cnblogs.com/lovephysics/p/7219169.html
