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tensorflow更改变量的值实例

yipeiwu_com6年前 (2020-03-06)Python基础

如下所示：

from __future__ import print_function,division
import tensorflow as tf

#create a Variable
w=tf.Variable(initial_value=[[1,2],[3,4]],dtype=tf.float32)
x=tf.Variable(initial_value=[[1,1],[1,1]],dtype=tf.float32,validate_shape=False)

init_op=tf.global_variables_initializer()
update=tf.assign(x,[[1,2],[1,2]])

with tf.Session() as session:
 session.run(init_op)
 session.run(update)
 x=session.run(x)
 print(x)

实验结果：

[[ 1. 2.]
 [ 1. 2.]]

tensorflow使用assign（variable，new_value）来更改变量的值，但是真正作用在garph中，必须要调用gpu或者cpu运行这个更新过程。

session.run(update)

tensorflow不支持直接对变量进行赋值更改

from __future__ import print_function,division
import tensorflow as tf

#create a Variable
x=tf.Variable(initial_value=[[1,1],[1,1]],dtype=tf.float32,validate_shape=False)
x=[[1,3],[2,4]]
init_op=tf.global_variables_initializer()
update=tf.assign(x,[[1,2],[1,2]])
with tf.Session() as session:
 session.run(init_op)
 session.run(update)
 print(session.run(x))

error:

"C:\Program Files\Anaconda3\python.exe" D:/pycharmprogram/tensorflow_learn/assign_learn/assign_learn.py
Traceback (most recent call last):
 File "D:/pycharmprogram/tensorflow_learn/assign_learn/assign_learn.py", line 8, in <module>
 update=tf.assign(x,[[1,2],[1,2]])
 File "C:\Program Files\Anaconda3\lib\site-packages\tensorflow\python\ops\state_ops.py", line 271, in assign
 if ref.dtype._is_ref_dtype:
AttributeError: 'list' object has no attribute 'dtype'

Process finished with exit code 1

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