Tensorflow Practice 2-2

 1 import tensorflow as tf
 2 import os
 3 os.environ['TF_CPP_MIN_LOG_LEVEL'] = '2'
 4 
 5 x = tf.Variable([1, 2])
 6 a = tf.constant([3, 3])
 7 '''增加一个减法op'''
 8 sub = tf.subtract(x, a)
 9 '''增加一个加法op'''
10 add = tf.add(x, sub)
11 
12 init = tf.global_variables_initializer()
13 
14 with tf.Session() as sess:
15     sess.run(init)
16     print(sess.run(sub))
17     print(sess.run(add))
18 
19 '''创建一个变量初始化为0'''
20 state = tf.Variable(0, name='counter')
21 '''创建一个op，作用是使state加1'''
22 new_value = tf.add(state, 1)
23 '''赋值op'''
24 update = tf.assign(state, new_value)
25 init = tf.global_variables_initializer()
26 with tf.Session() as sess:
27     sess.run(init)
28     print(sess.run(state))
29     for _ in range(5):
30         print(sess.run(update))