Ungültiger Typ muss eine Zeichenfolge sein oder Tensor [TensorFlow]

Problem habe ich in Machine Learning library von Google - Tensorflow.
Wenn ich Sie initialisieren wollen meiner session, es sagt mir, dass sein muss, string oder tensor. Ich haben Sie nicht vor Ort sind keine Fehler.

import tensorflow as tf
from tensorflow.examples.tutorials.mnist import input_data
mnist = input_data.read_data_sets('MNIST_data', one_hot=True)

sess = tf.InteractiveSession()

x = tf.placeholder(tf.float32, shape=[None, 784])
y_ = tf.placeholder(tf.float32, shape=[None, 10])

W = tf.Variable(tf.zeros([784,10]))
b = tf.Variable(tf.zeros([10]))

sess.run(tf.initialize_all_variables)

y = tf.nn.softmax(tf.matmul(x,W) + b)

cross_entropy = tf.reduce_mean(-tf.reduce_sum(y_ * tf.log(y), reduction_indices=[1]))

train_step = tf.train.GradientDescentOptimizer(0.5).minimize(cross_entropy)

for i in range(1000):
    batch = mnist.train.next_batch(50)
    train_step.run(feed_dict={x: batch[0], y_: batch[1]})

correct_prediction = tf.equal(tf.argmax(y,1), tf.argmax(y_,1))
accuracy = tf.reduce_mean(tf.cast(correct_prediction, tf.float32))

print accuracy.eval(feed_dict={x: mnist.test.images, y_: mnist.test.labels})

Dies ist die Ausgabe des folgenden Programms im terminal:

(tensorflow) juldou-box@juldou-box:~/tensorflow$ python mnist_e.py 
Extracting MNIST_data/train-images-idx3-ubyte.gz
Extracting MNIST_data/train-labels-idx1-ubyte.gz
Extracting MNIST_data/t10k-images-idx3-ubyte.gz
Extracting MNIST_data/t10k-labels-idx1-ubyte.gz
Traceback (most recent call last):
  File "mnist_e.py", line 13, in <module>
    sess.run(tf.initialize_all_variables)
  File "/home/juldou-box/tensorflow/local/lib/python2.7/site-packages/tensorflow/python/client/session.py", line 372, in run
    run_metadata_ptr)
  File "/home/juldou-box/tensorflow/local/lib/python2.7/site-packages/tensorflow/python/client/session.py", line 584, in _run
    processed_fetches = self._process_fetches(fetches)
  File "/home/juldou-box/tensorflow/local/lib/python2.7/site-packages/tensorflow/python/client/session.py", line 540, in _process_fetches
    % (subfetch, fetch, type(subfetch), str(e)))
TypeError: Fetch argument <function initialize_all_variables at 0x7fe4ca157c80> of <function initialize_all_variables at 0x7fe4ca157c80> has invalid type <type 'function'>, must be a string or Tensor. (Can not convert a function into a Tensor or Operation.)
  • es ist nur ein syntax-Fehler, siehe meine Antwort
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