pythonpath

查找python安装路径：

>>>from distutils.sysconfig import get_python_lib>>>print (get_python_lib())

W tensorflow/core/platform/cpu_feature_guard.cc:45] The TensorFlow library wasn’t compiled to use SSE3 instructions, but these are available on your machine and could speed up CPU computations.
那么需要说明的是：这些是warnings，不是error。这些warings的意思是说：你的机器上有这些指令集可以用，并且用了他们会加快你的CPU运行速度，但是你的TensorFlow在编译的时候并没有用到这些指令集。

1.The best way to maximise TF performance (apart from writing good code !!), is to compile it from the sources

2.Those are simply warnings. They are just informing you if you build TensorFlow from source it can be faster on your machine. Those instructions are not enabled by default on the builds available I think to be compatible with more CPUs as possible.

$ export TF_CPP_MIN_LOG_LEVEL=2

tf.Session()不会再给出上述warning

$ alias python='/Library/Frameworks/Python.framework/Versions/3.5/bin/python3.5'

保存退出后，执行

$ source ~/.bash_profile