TensorFlow 似乎没有安装

Question

我有这些警告：

2017-09-26 14:50:45.956966: W tensorflow/core/platform/cpu_feature_guard.cc:45] TensorFlow 库未编译为使用 SSE4.2 指令，但这些在您的计算机上可用并且可以加快 CPU 计算速度。

2017-09-26 14:50:45.956986: W tensorflow/core/platform/cpu_feature_guard.cc:45] TensorFlow 库未编译为使用 AVX 指令，但这些在您的计算机上可用并且可以加快速度CPU 计算。

2017-09-26 14:50:45.956990: W tensorflow/core/platform/cpu_feature_guard.cc:45] TensorFlow 库未编译为使用 AVX2 指令，但这些在您的计算机上可用并且可以加快速度CPU 计算。

2017-09-26 14:50:45.956996: W tensorflow/core/platform/cpu_feature_guard.cc:45] TensorFlow 库未编译为使用 FMA 指令，但这些在您的计算机上可用并且可以加快速度CPU 计算。

所以，根据我在互联网上找到的信息，我点击了这个链接：

https://www.tensorflow.org/install/install_sources

但是，当我尝试时：

$ python

和：

# Python
import tensorflow as tf
hello = tf.constant('Hello, TensorFlow!')
sess = tf.Session()
print(sess.run(hello))

输出应该是：Hello, TensorFlow!

但是，我完全不明白......

emixam23@pt-mguittet:~/Workspace$ python
Python 3.6.2 (default, Sep  4 2017, 16:58:35) 
[GCC 4.2.1 Compatible Apple LLVM 8.1.0 (clang-802.0.42)] on darwin
Type "help", "copyright", "credits" or "license" for more information.

>>> import tensorflow as tf
>>> hello = tf.constant('Hello, TensorFlow!')
>>> sess = tf.Session()
2017-09-26 14:56:33.905065: W tensorflow/core/platform/cpu_feature_guard.cc:45] The TensorFlow library wasn't compiled to use SSE4.2 instructions, but these are available on your machine and could speed up CPU computations.
2017-09-26 14:56:33.905096: W tensorflow/core/platform/cpu_feature_guard.cc:45] The TensorFlow library wasn't compiled to use AVX instructions, but these are available on your machine and could speed up CPU computations.
2017-09-26 14:56:33.905105: W tensorflow/core/platform/cpu_feature_guard.cc:45] The TensorFlow library wasn't compiled to use AVX2 instructions, but these are available on your machine and could speed up CPU computations.
2017-09-26 14:56:33.905112: W tensorflow/core/platform/cpu_feature_guard.cc:45] The TensorFlow library wasn't compiled to use FMA instructions, but these are available on your machine and could speed up CPU computations.
>>> print(sess.run(hello))
b'Hello, TensorFlow!'
>>> 

即使我安装了它，我仍然有警告，为什么会这样？我用的是Xcode 7.3，没有把GPU放到./configuration进程中。

有什么想法吗？ :/ 提前致谢！

Answer 1

你为什么说它似乎没有安装？

你得到了你所期望的（你好，Tensorflow！），但你也得到了这些警告。关于警告，已在此处讨论：Your CPU supports instructions that this TensorFlow binary was not compiled to use: AVX AVX2

关于 Hello,Tensorflow! 之前的“b'”，请参阅 What does the 'b' character do in front of a string literal?。

希望对你有帮助。

Answer 2

您可以像这样屏蔽这些警告：

import os
os.environ['TF_CPP_MIN_LOG_LEVEL'] = '3'

请注意，您的程序仍然输出“Hello，TensorFlow！”，只是在所有有关 SSE4.2 的警告之后。