学习tensorflow之mac上安装tensorflow

背景

# Only CPU-version is available at the moment.
$ pip install https://storage.googleapis.com/tensorflow/mac/tensorflow-0.5.0-py2-none-any.whl[/code] 

安装pip
用到了一个 pip 的工具,查了一下pip类似RedHat里面的yum,安装Python包非常方便. 

好吧,那就装一个pip.pip的安装方法也很简单,就是前提需要先安装python.然后去下载 pip的安装包 ,pip安装命令如下: 
qyfmac$ tar zxvf pip-7.1.2.tar.gz
qyfmac$ cd pip-7.1.2
qyfmac$ python setup.py install


安装时报错了:
qyfmac$ python setup.py install
running install
Checking .pth file support in /Library/Python/2.7/site-packages/
error: can't create or remove files in install directory
The following error occurred while trying to add or remove files in the
installation directory:
[Errno 13] Permission denied: '/Library/Python/2.7/site-packages/test-easy-install-38643.pth'
The installation directory you specified (via --install-dir, --prefix, or
the distutils default setting) was:
/Library/Python/2.7/site-packages/
Perhaps your account does not have write access to this directory?  If the
installation directory is a system-owned directory, you may need to sign in
as the administrator or "root" account.  If you do not have administrative
access to this machine, you may wish to choose a different installation
directory, preferably one that is listed in your PYTHONPATH environment
variable.
For information on other options, you may wish to consult the
documentation at: https://pythonhosted.org/setuptools/easy_install.html Please make the appropriate changes for your system and try again.

[/code]

里面有个 
Permission denied
 意思是权限不足,我们价格sudo继续执行. 
qyfmac$ sudo python setup.py install


安装完后执行命令 
pip freeze
 列出安装的packages验证一下pip安装好没. 
qyfmac$ pip freeze
altgraph==0.10.2
bdist-mpkg==0.5.0
bonjour-py==0.3
macholib==1.5.1
matplotlib==1.3.1
modulegraph==0.10.4
numpy==1.10.1
py2app==0.7.3
...


列出了好多包,我唯一没搞懂的就是我什么时候装了这么多包.

安装tensorflow
到了我们的主角出场了.执行安装命令安装tensorflow.
qyfmac$ pip install https://storage.googleapis.com/tensorflow/mac/tensorflow-0.5.0-py2-none-any.whl[/code] 
悲剧依旧发生了,googleapis.com这个鬼要弄把梯子才能访问,下载各种超时.

黄天不负苦心人,有一有心人已经下好并上传的了百度云 http://pan.baidu.com/s/1ntjaMnf 密码:sznb. 

下载下来安装之.
qyfmac$ pip install --upgrade tensorflow-0.5.0-py2-none-any.whl


安装virtualenv
virtualenv是python的沙箱工具.我们毕竟是在自己机器上做实验,为了不来回修改各种环境变量,我们一般还是弄个沙箱完比较好.测试完直接删除就行,不用再去改各种配置文件.

用pip命令来安装:
qyfmac$ sudo pip install --upgrade virtualenv


安装好后创建一个工作目录,我直接在home里创建了个文件夹.
qyfmac$ virtualenv --system-site-packages ~/tensorflow


然后进入目录激活沙箱.
qyfmac$ cd ~/tensorflow
qyfmac$ source bin/activate
(tensorflow) qyfmac$


在virtualenv里安装tensorflow
把下载下来的 
tensorflow-0.5.0-py2-none-any.whl
 文件放到 
~/tensorflow
 目录里. 

进入沙箱后,执行命令来安装tensorflow在沙箱中.

(tensorflow) qyfmac$ pip install --upgrade tensorflow-0.5.0-py2-none-any.whl


运行tensorflow
我是在virtualenv里运行的.直接在系统里执行方式是一样的.

照着官方文档敲了个 简单例子 . 
(tensorflow) qyfmac$ python
Python 2.7.10 (default, Aug 22 2015, 20:33:39)
[GCC 4.2.1 Compatible Apple LLVM 7.0.0 (clang-700.0.59.1)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import tensorflow as tf
>>> hello = tf.constant('Hello,TensorFlow!')
>>> sess = tf.Session()
>>> print sess.run(hello)
Hello, TensorFlow!
>>>


在敲 
see = tf.Session()
 这行时会报一个错 
can't determine number of CPU cores: assuming 4
I tensorflow/core/common_runtime/local_device.cc:25] Local device intra op parallelism threads: 4
can't determine number of CPU cores: assuming 4
I tensorflow/core/common_runtime/local_session.cc:45] Local session inter op parallelism threads: 4


可以先不用理会,不影响最终执行结果.

参考
tensorflow官方地址: http://tensorflow.org
tensorflow软件下载地址: http://pan.baidu.com/s/1ntjaMnf 密码:sznb. 
pip官方地址: https://pypi.python.org/pypi/pip
setuptools官方地址: https://pypi.python.org/pypi/setuptools
python安装setuptools步骤详解: http://www.111cn.net/phper/python/66848.htm