Question

我正在尝试运行在colab上发现的非常简单的tensorflow代码，但似乎我缺少有关它的一些基本知识。

我已经尝试用xy_sum.eval（session = sess）替换xy_sum.eval（），但问题似乎仍然存在。这是“我的”代码：

from __future__ import print_function
import tensorflow as tf
g=tf.Graph()
with g.as_default():
    x=tf.constant(8,name="x_const")
    y=tf.constant(5,name="y_const")
    xy_sum=tf.add(x,y,name="x_y_sum")
with tf.Session() as sess:
    print(xy_sum.eval())

我希望输出为https://colab.research.google.com/notebooks/mlcc/tensorflow_programming_concepts.ipynb#scrollTo=Md8ze8e9geMi所示的13，但是我从spyder得到的输出是

Traceback (most recent call last):

  File "<ipython-input-35-67314fd48aa4>", line 1, in <module>
    runfile('/home/***/.config/spyder-py3/New Folder/sommatf.py', wdir='/home/***/.config/spyder-py3/New Folder')

  File "/home/***/python3.7/site-packages/spyder_kernels/customize/spydercustomize.py", line 786, in runfile
    execfile(filename, namespace)

  File "/home/***/python3.7/site-packages/spyder_kernels/customize/spydercustomize.py", line 110, in execfile
    exec(compile(f.read(), filename, 'exec'), namespace)

  File "/home/***/.config/spyder-py3/New Folder/sommatf.py", line 15, in <module>
    print(xy_sum.eval())

  File "/home/***/python3.7/site-packages/tensorflow/python/framework/ops.py", line 695, in eval
    return _eval_using_default_session(self, feed_dict, self.graph, session)

  File "/home/***/python3.7/site-packages/tensorflow/python/framework/ops.py", line 5172, in _eval_using_default_session
    raise ValueError("Cannot use the default session to evaluate tensor: "

ValueError: Cannot use the default session to evaluate tensor: the tensor's graph is different from the session's graph. Pass an explicit session to `eval(session=sess)`.

如果我按照建议尝试通过显式会话，则会得到：

raise ValueError("Cannot use the given session to evaluate tensor: "

ValueError: Cannot use the given session to evaluate tensor: the tensor's graph is different from the session's graph.

Answer 1

- (BOOL) someMethodWithError: (NSError **) outError { [self.something attempt]; if (!self.something.succeeded) { if (nil != outError) { *outError = [self makeSomeDescriptiveErrorFromSomething: self.something]; } return NO; } else { return YES; } }使用默认图形。因此，为了使用图tf.Session，您将不得不缩进会话初始化到g块中，或者将图传递给会话at initialization。

这是什么意思：“张量图与会话图不同”。

1 个答案: