只能在SPYDER IDE中的程序启动时调用tf.enable_eager_execution

Question

我试着对一个简单的代码执行一个急切的执行。

我在Jupyter笔记本和Spyder IDE上都试过。 对于Jupyter，我没有问题，但是当我在Spyder中执行代码时，它会返回一个错误：

File "C:\...\lib\site-packages\tensorflow\python\framework\ops.py", line 5496, in enable_eager_execution "tf.enable_eager_execution must be called at program startup.")
ValueError: tf.enable_eager_execution must be called at program startup.

代码如下：

import tensorflow as tf
tf.enable_eager_execution ()
import tensorflow.contrib.eager as tfe
def square (x):
     return tf.multiply (x, x)

grad = tfe.gradients_function (square)

print (grad (3.))