一个简单的tensorflow示例

 1 import tensorflow as tf
 2 
 3 #creates the graph represented
 4 x = tf.Variable(3, name='x')
 5 y = tf.Variable(4, name='y')
 6 f = x * x * y + y + 2
 7 
 8 #open a tensorflow session and use it to initialize the variable and evaluate f.
 9 init = tf.global_variables_initializer()#prepare the init node
10 with tf.Session() as sess:
11     init.run()#initalize all the node
12     result = f.eval()
13 
14 sess = tf.InteractiveSession()
15 init.run()
16 result = f.eval()
17 print(result)
18 sess.close()
19 
20 #judge x twice
21 w = tf.constant(3)
22 x = w + 2
23 y = x + 5
24 z = x * 3
25 
26 with tf.Session() as sess:
27     print(y.eval())
28     print(z.eval())
29 sess.close()
30 
31 #judge x once
32 with tf.Session() as sess:
33     y_val, z_val = sess.run([y,z])
34     print(y_val)
35     print(z_val)
36 sess.close()