tensorflow更改变量的值实例

技术  /  管理员 发布于 7年前   178

如下所示：

from __future__ import print_function,divisionimport tensorflow as tf#create a Variablew=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,divisionimport tensorflow as tf#create a Variablex=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.pyTraceback (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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