最近在mac上用到xgboost库，安装时遇到颇多大坑，网上查了很多答案几乎都是win上的问题，没遇到理想的，自己也就摸着石头把几个大坑给填了，总结一下，给后人少走点弯路。
1.错误
倘若直接 pip install xgboost时，会出现Command "python setup.py egg_info" failed with error code 1的错误提示，
还是乖乖使用Github源代码安装吧~
2.正确的打开方式
cd ~
git clone --recursive https://github.com/dmlc/xgboost
终端输出：
Cloning into 'xgboost'...
remote: Counting objects: 19864, done.
remote: Total 19864 (delta 0), reused 0 (delta 0), pack-reused 19863
Receiving objects: 100% (19864/19864), 6.69 MiB | 76.00 KiB/s, done.
Resolving deltas: 100% (11937/11937), done.
Submodule 'dmlc-core' (https://github.com/dmlc/dmlc-core) registered for path 'dmlc-core'
Submodule 'rabit' (https://github.com/dmlc/rabit) registered for path 'rabit'
Cloning into '/Users/henrylee/xgboost/dmlc-core'...
Cloning into '/Users/henrylee/xgboost/rabit'...
Submodule path 'dmlc-core': checked out 'b5bec5481df86e8e6728d8bd80a61d87ef3b2cd5'
Submodule path 'rabit': checked out 'a764d45cfb438cc9f15cf47ce586c02ff2c65d0f'
可看出gitclone下来的时候回自动clone上其引用库，而直接使用Release包则不会
cd xgboost
注意： 倘若直接使用
cd python-package; sudo python setup.py install
会出现:
Traceback (most recent call last):
File "setup.py", line 19, in <module>
LIB_PATH = [os.path.relpath(libfile, CURRENT_DIR) for libfile in libpath['find_lib_path']()]
File "xgboost/libpath.py", line 46, in find_lib_path
'List of candidates:\n' + ('\n'.join(dll_path)))
__builtin__.XGBoostLibraryNotFound: Cannot find XGBoost Library in the candidate path, did you install compilers and run build.sh in root path?
的错误提示，意思是你还是先跑跑文件夹下面的build.sh吧
注：
使用Release包会报错/dmlc-core下找不到某文件，这也是不要使用Release包的原因
cd ~/xgboost
bash build.sh
这时会出现一大堆C++编译，若无出现则可能像官网所说使用brew安装下GCC——brew install gcc --without-multilib
这个时候就真可以名正而顺地使用
cd python-package; sudo python setup.py install
最后会终端出现：
Finished processing dependencies for xgboost==0.6
代表安装成功了。
3.打开Pycharm
安装成功后Pycharm里 —> Preferences —> Project Interpreter 就可以找到xgboost的影子了
Pycharm —> Preferences —> Project Interpreter
