python - Keras 包安装

Question

我正在尝试安装 Keras 软件包以使用机器学习工具。不幸的是我无法这样做。我已经安装了theano。我在 python 3.5 的单独环境中安装了tensorflow，但我尝试使用 python 2.7。这是问题所在吗？

C:\Users\User>pip install tensorflow   
Collecting tensorflow   
  Could not find a version that satisfies the requirement tensorflow (from versions: )   
No matching distribution found for tensorflow   

C:\Users\User>pip install keras
Requirement already satisfied: keras in c:\users\user\anaconda2\lib\site-packages   
Requirement already satisfied: theano in c:\users\user\anaconda2\lib\site-packages (from keras)   
Requirement already satisfied: pyyaml in c:\users\user\anaconda2\lib\site-packages (from keras)   
Requirement already satisfied: six in c:\users\user\anaconda2\lib\site-packages (from keras)   
Requirement already satisfied: numpy>=1.9.1 in c:\users\user\anaconda2\lib\site-packages (from theano->keras)   
Requirement already satisfied: scipy>=0.14 in c:\users\user\anaconda2\lib\site-packages (from theano->keras)   

当我尝试导入 keras 时，我仍然遇到导入错误，提示找不到 Tensorflow 后端

Answer 1

tensorflow officially仅支持 Windows 上的 Python 3.5.x。对于 python 2，您需要将后端切换到 Theano。您可以在 C:\Users\username\.keras\keras.json 中将 Keras 后端更改为 Theano。另请检查this文档。

如果你想在脚本中切换到另一个keras后端，你也可以使用以下代码:

import os
os.environ['KERAS_BACKEND'] = "theano" #or "tensorflow"
import keras