tensorflow学习(2)关于fetch和feed

fetch:可以取多个操作节点的值

import tensorflow as tf

input1 =tf.constant(7.0)
input2 =tf.constant(2.0)

add =tf.add(input1,input2)
mul =tf.multiply(add,input1)

with tf.Session() as sess:
    result =sess.run([add,mul])
    print (result)

feed:对占位符进行赋值,字典形式传入

import tensorflow as tf
input1 =tf.placeholder(tf.float32)
input2 =tf.placeholder(tf.float32)

mul =tf.multiply(input1,input2)

with tf.Session() as sess:
    print (sess.run(mul,feed_dict={input1:[7.],input2:[2.]}))

 

 

 

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