placeholder使用_placeholder怎么用

• 代码如下：

#!/usr/bin/python
import tensorflow as tf
x1 = tf.placeholder(tf.int32,shape=[1],name='x1')
x2 = tf.constant(5,name = 'x2')
result = x1 + x2
with tf.Session() as sess:
        print(sess.run(result,{x1:[3]}))

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x1 定义为placeholder
x2定义为constant

• 执行结果如下
  
  
  tf.placeholder(
  dtype,
  shape=None,
  name=None
  )

dtype: The type of elements in the tensor to be fed.
shape: The shape of the tensor to be fed (optional). If the shape is not specified, you can feed a tensor of any shape.
name: A name for the operation (optional).