mxnet在mac上的编译，坑非常多，比如config.mk中的配置，必须注意行尾无空格，否则就会找不到库。现将步骤总结如下：
1. 安装brew并添加相关源
$/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
$brew tap homebrew/science
2. 下载并安装Xcode Command Line Tools
$xcode-select --install
3. 安装CUDA
在nvidia 官网选择对应的版本下载并安装
https://developer.nvidia.com/cuda-downloads
设置环境变量，编辑.bash_profile文件：
vi ~/.bash_profile
在开头添加CUDA的环境变量：
export CUDA_HOME=/usr/local/cuda
export DYLD_LIBRARY_PATH="$DYLD_LIBRARY_PATH:$CUDA_HOME/lib"
export PATH="$CUDA_HOME/bin:$PATH"
4. 安装Python3
$brew install python3
5. 通过brew安装opencv3和openblas
用brew编译opencv3
$brew install opencv3 --with-ippicv --with-contrib --with-python3 --with-cuda --c++11
$brew link --overwrite --force opencv3
用brew编译安装openblas
brew install openblas
brew link openblas
6. 安装mxnet
$git clone --recursive https://github.com/dmlc/mxnet
$cd mxnet
$cp make/osx.mk config.mk
用命令行修改 config.mk配置文件，避免行尾空格造成编译失败，输入：
echo "USE_CUDA = 1" >> ./config.mk
echo "USE_CUDA_PATH = /usr/local/cuda" >> ./config.mk
echo "USE_BLAS = openblas" >> ./config.mk
echo "ADD_CFLAGS += -I/usr/local/opt/openblas/include" >> ./config.mk
echo "ADD_LDFLAGS += -L/usr/local/opt/openblas/lib" >> ./config.mk
7. 安装Python库
一路顺利的话，进入源码目录后的python目录，安装相应的python库：
cd python
sudo python3 setup.py install
小试一下：
$ python3
Python 3.5.2 (default, Dec 23 2016, 10:27:01)
[GCC 4.2.1 Compatible Apple LLVM 8.0.0 (clang-800.0.42.1)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import mxnet
>>>
如果没有错误的话，就表示已经安装成功了。
